Research article
23 Apr 2018
Research article
| 23 Apr 2018
Controls on fault zone structure and brittle fracturing in the foliated hanging wall of the Alpine Fault
Jack N. Williams et al.
Related authors
Jack N. Williams, Luke N. J. Wedmore, Åke Fagereng, Maximilian J. Werner, Hassan Mdala, Donna J. Shillington, Christopher A. Scholz, Folarin Kolawole, Lachlan J. M. Wright, Juliet Biggs, Zuze Dulanya, Felix Mphepo, and Patrick Chindandali
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2021-306, https://doi.org/10.5194/nhess-2021-306, 2021
Revised manuscript under review for NHESS
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We use geologic and GPS data to constrain the magnitude and frequency of earthquakes that occur along active faults in Malawi. These faults slip in earthquakes as the tectonic plates either side of the East African Rift in Malawi diverge from one another. Low divergence rates (0.5–1.5 mm/yr) and long faults (5–200 km) imply that earthquakes along these faults are rare (once every 1,000–10,000 years) but could have high magnitudes (M 7–8). These data can be used to assess seismic risk in Malawi.
Jack N. Williams, Hassan Mdala, Åke Fagereng, Luke N. J. Wedmore, Juliet Biggs, Zuze Dulanya, Patrick Chindandali, and Felix Mphepo
Solid Earth, 12, 187–217, https://doi.org/10.5194/se-12-187-2021, https://doi.org/10.5194/se-12-187-2021, 2021
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Earthquake hazard is often specified using instrumental records. However, this record may not accurately forecast the location and magnitude of future earthquakes as it is short (100s of years) relative to their frequency along geologic faults (1000s of years). Here, we describe an approach to assess this hazard using fault maps and GPS data. By applying this to southern Malawi, we find that its faults may host rare (1 in 10 000 years) M 7 earthquakes that pose a risk to its growing population.
Jack N. Williams, Joseph J. Bevitt, and Virginia G. Toy
Sci. Dril., 22, 35–42, https://doi.org/10.5194/sd-22-35-2017, https://doi.org/10.5194/sd-22-35-2017, 2017
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We compare images of drillcore from the Alpine Fault in New Zealand that were collected using X-ray computed tomography (CT) and neutron tomography (NT). Both techniques provide 3-D images of the core's internal structure, which would not be possible through visual analysis alone. We find that CT scans are more beneficial, as they can image a wider range of rock types, and this scanning technique is more practical. Nevertheless, NT provides complementary scans over limited intervals of core.
Matthew S. Tarling, Matteo Demurtas, Steven A. F. Smith, Jeremy S. Rooney, Marianne Negrini, Cecilia Viti, Jasmine R. Petriglieri, and Keith C. Gordon
Eur. J. Mineral., 34, 285–300, https://doi.org/10.5194/ejm-34-285-2022, https://doi.org/10.5194/ejm-34-285-2022, 2022
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Rocks containing the serpentine mineral lizardite occur in many tectonic settings. Knowing the crystal orientation of lizardite in these rocks tells us how they deform and gives insights into their physical properties. The crystal orientation of lizardite is challenging to obtain using standard techniques. To overcome this challenge, we developed a method using Raman spectroscopy to map the crystal orientation of lizardite with minimal preparation on standard thin sections.
Hamed Amiri, Francesco Cappuccio, Mai-Linh Doan, Marianne Conin, and Virginia Toy
Solid Earth Discuss., https://doi.org/10.5194/se-2021-150, https://doi.org/10.5194/se-2021-150, 2022
Revised manuscript has not been submitted
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In March 2011, the Mw ~9 Tohoku-oki earthquake, one of the largest seismic events ever recorded, occurred across a megathrust fault in the west of the Japan trench. This devastating earthquake stressed the need for more detailed studies on the fault zone behavior and the main causes of this event.
Jack N. Williams, Luke N. J. Wedmore, Åke Fagereng, Maximilian J. Werner, Hassan Mdala, Donna J. Shillington, Christopher A. Scholz, Folarin Kolawole, Lachlan J. M. Wright, Juliet Biggs, Zuze Dulanya, Felix Mphepo, and Patrick Chindandali
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2021-306, https://doi.org/10.5194/nhess-2021-306, 2021
Revised manuscript under review for NHESS
Short summary
Short summary
We use geologic and GPS data to constrain the magnitude and frequency of earthquakes that occur along active faults in Malawi. These faults slip in earthquakes as the tectonic plates either side of the East African Rift in Malawi diverge from one another. Low divergence rates (0.5–1.5 mm/yr) and long faults (5–200 km) imply that earthquakes along these faults are rare (once every 1,000–10,000 years) but could have high magnitudes (M 7–8). These data can be used to assess seismic risk in Malawi.
Matteo Demurtas, Steven A.F. Smith, Elena Spagnuolo, and Giulio Di Toro
Solid Earth, 12, 595–612, https://doi.org/10.5194/se-12-595-2021, https://doi.org/10.5194/se-12-595-2021, 2021
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We performed shear experiments on calcite–dolomite gouge mixtures to better understand the behaviour of carbonates during sub-seismic to seismic deformation in the shallow crust. The development of a foliation in the gouge was only restricted to coseismic sliding, whereas fluidisation occurred over a wide range of slip velocities (sub-seismic to coseismic) in the presence of water. These observations will contribute to a better interpretation of the rock record.
Jack N. Williams, Hassan Mdala, Åke Fagereng, Luke N. J. Wedmore, Juliet Biggs, Zuze Dulanya, Patrick Chindandali, and Felix Mphepo
Solid Earth, 12, 187–217, https://doi.org/10.5194/se-12-187-2021, https://doi.org/10.5194/se-12-187-2021, 2021
Short summary
Short summary
Earthquake hazard is often specified using instrumental records. However, this record may not accurately forecast the location and magnitude of future earthquakes as it is short (100s of years) relative to their frequency along geologic faults (1000s of years). Here, we describe an approach to assess this hazard using fault maps and GPS data. By applying this to southern Malawi, we find that its faults may host rare (1 in 10 000 years) M 7 earthquakes that pose a risk to its growing population.
Martina Kirilova, Virginia Toy, Katrina Sauer, François Renard, Klaus Gessner, Richard Wirth, Xianghui Xiao, and Risa Matsumura
Solid Earth, 11, 2425–2438, https://doi.org/10.5194/se-11-2425-2020, https://doi.org/10.5194/se-11-2425-2020, 2020
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Processes associated with open pores can change the physical properties of rocks and cause earthquakes. In borehole samples from the Alpine Fault zone, we show that many pores in these rocks were filled by weak materials that can slide easily. The amount of open spaces was thus reduced, and fluids circulating within them built up high pressures. Both weak materials and high pressures within pores reduce the rock strength; thus the state of pores here can trigger the next Alpine Fault earthquake.
Bernhard Schuck, Anja M. Schleicher, Christoph Janssen, Virginia G. Toy, and Georg Dresen
Solid Earth, 11, 95–124, https://doi.org/10.5194/se-11-95-2020, https://doi.org/10.5194/se-11-95-2020, 2020
Matthew S. Tarling, Steven A. F. Smith, James M. Scott, Jeremy S. Rooney, Cecilia Viti, and Keith C. Gordon
Solid Earth, 10, 1025–1047, https://doi.org/10.5194/se-10-1025-2019, https://doi.org/10.5194/se-10-1025-2019, 2019
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Shear zones dominated by hydrated mantle rocks (serpentinites) occur in many tectonic settings around the world. To better understand the internal structure, composition and possible mechanical behaviour of these shear zones, we performed a detailed field, petrological and microanalytical study of the Livingstone Fault in New Zealand. We propose a conceptual model to account for the main physical and chemical processes that control deformation in large serpentinite shear zones.
Steven B. Kidder, Virginia G. Toy, David J. Prior, Timothy A. Little, Ashfaq Khan, and Colin MacRae
Solid Earth, 9, 1123–1139, https://doi.org/10.5194/se-9-1123-2018, https://doi.org/10.5194/se-9-1123-2018, 2018
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By quantifying trace concentrations of titanium in quartz (a known geologic “thermometer”), we constrain the temperature profile for the deep crust along the Alpine Fault. We show there is a sharp change from fairly uniform temperatures at deep levels to a very steep gradient in temperature in the upper kilometers of the crust.
Martina Kirilova, Virginia Toy, Jeremy S. Rooney, Carolina Giorgetti, Keith C. Gordon, Cristiano Collettini, and Toru Takeshita
Solid Earth, 9, 223–231, https://doi.org/10.5194/se-9-223-2018, https://doi.org/10.5194/se-9-223-2018, 2018
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Graphite crystallinity “irreversibly” increases with temperature and it has been calibrated as a thermometer recording peak temperatures experienced by a rock. To examine the possibility of mechanical modifications of graphite structure and the impacts on graphite thermometry we performed deformation experiments. Raman spectroscopy demonstrates a reduction in crystallinity due to mechanical reworking in the brittle field. This finding clearly compromises the validity of the graphite thermometry.
Jack N. Williams, Joseph J. Bevitt, and Virginia G. Toy
Sci. Dril., 22, 35–42, https://doi.org/10.5194/sd-22-35-2017, https://doi.org/10.5194/sd-22-35-2017, 2017
Short summary
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We compare images of drillcore from the Alpine Fault in New Zealand that were collected using X-ray computed tomography (CT) and neutron tomography (NT). Both techniques provide 3-D images of the core's internal structure, which would not be possible through visual analysis alone. We find that CT scans are more beneficial, as they can image a wider range of rock types, and this scanning technique is more practical. Nevertheless, NT provides complementary scans over limited intervals of core.
J. Shervais, J. Evans, V. Toy, J. Kirkpatrick, A. Clarke, and J. Eichelberger
Sci. Dril., 18, 19–33, https://doi.org/10.5194/sd-18-19-2014, https://doi.org/10.5194/sd-18-19-2014, 2014
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Revised manuscript accepted for SE
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Emma A. H. Michie, Mark J. Mulrooney, and Alvar Braathen
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Generating an accurate model of the subsurface is crucial when assessing a site for CO2 storage, particularly for a fault-bound storage site that may act as a seal or could reactivate upon CO2 injection. However, we have shown how picking strategy, i.e. line spacing, chosen to create the model significantly influences any subsequent fault analyses but is surprisingly rarely discussed. This analysis has been performed on the Vette Fault bounding the Smeaheia potential CO2 storage site.
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To assess the role smaller graben structures near the southern edge of the Central European Basin System play in the basin’s overall deformational history, we take advantage of a feature found on some of these structures, where slivers from older rock units appear along the graben's main fault, surrounded on both sides by younger strata. The implications for the geometry of the fault provide a substantially improved estimate for the magnitude of normal and thrust motion along the fault system.
Domingo G. A. M. Aerden, Alejandro Ruiz-Fuentes, Mohammad Sayab, and Aidan Forde
Solid Earth, 12, 971–992, https://doi.org/10.5194/se-12-971-2021, https://doi.org/10.5194/se-12-971-2021, 2021
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We studied the geometry of foliations and microfolds preserved within metamorphic garnet crystals using X-ray tomography. The studied rocks are blueschists from Ile de Groix formed during Late Devonian subduction of Gondwana under Armorica. Several sets of differently oriented microfabrics were found recording variations in the direction of subduction. Comparison with similar data for Iberia supports that Iberia rotated only 10–20° during the Cretaceous opening of the North Atlantic.
Alessandro Tibaldi, Noemi Corti, Emanuela De Beni, Fabio Luca Bonali, Susanna Falsaperla, Horst Langer, Marco Neri, Massimo Cantarero, Danilo Reitano, and Luca Fallati
Solid Earth, 12, 801–816, https://doi.org/10.5194/se-12-801-2021, https://doi.org/10.5194/se-12-801-2021, 2021
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The Northeast Rift of Mt Etna is affected by ground deformation linked to gravity sliding of the volcano flank and dike injection. Drone surveys show that the rift is affected by NE-striking extensional fractures and normal faults. Given an age of 1614 CE for the offset lavas, we obtained an extension rate of 1.9 cm yr−1 for the last 406 years. The stress field is characterised by a NW–SE σHmin. Drone surveys allow us to quickly collect data with a resolution of 2–3 cm.
Matteo Demurtas, Steven A.F. Smith, Elena Spagnuolo, and Giulio Di Toro
Solid Earth, 12, 595–612, https://doi.org/10.5194/se-12-595-2021, https://doi.org/10.5194/se-12-595-2021, 2021
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We performed shear experiments on calcite–dolomite gouge mixtures to better understand the behaviour of carbonates during sub-seismic to seismic deformation in the shallow crust. The development of a foliation in the gouge was only restricted to coseismic sliding, whereas fluidisation occurred over a wide range of slip velocities (sub-seismic to coseismic) in the presence of water. These observations will contribute to a better interpretation of the rock record.
James Gilgannon, Marius Waldvogel, Thomas Poulet, Florian Fusseis, Alfons Berger, Auke Barnhoorn, and Marco Herwegh
Solid Earth, 12, 405–420, https://doi.org/10.5194/se-12-405-2021, https://doi.org/10.5194/se-12-405-2021, 2021
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Using experiments that simulate deep tectonic interfaces, known as viscous shear zones, we found that these zones spontaneously develop periodic sheets of small pores. The presence of porous layers in deep rocks undergoing tectonic deformation is significant because it requires a change to the current model of how the Earth deforms. Emergent porous layers in viscous rocks will focus mineralising fluids and could lead to the seismic failure of rocks that are never supposed to have this occur.
Jef Deckers, Bernd Rombaut, Koen Van Noten, and Kris Vanneste
Solid Earth, 12, 345–361, https://doi.org/10.5194/se-12-345-2021, https://doi.org/10.5194/se-12-345-2021, 2021
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This study shows the presence of two structural domains in the western border fault system of the Roer Valley graben. These domains, dominated by NW–SE-striking faults, displayed distinctly different strain distributions during both Late Cretaceous compression and Cenozoic extension. The southern domain is characterized by narrow, localized faulting, while the northern domain is characterized by wide, distributed faulting. The non-colinear WNW–ESE Grote Brogel fault links both domains.
José Piquer, Orlando Rivera, Gonzalo Yáñez, and Nicolás Oyarzún
Solid Earth, 12, 253–273, https://doi.org/10.5194/se-12-253-2021, https://doi.org/10.5194/se-12-253-2021, 2021
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A proper recognition of deep, long-lived fault systems is very important for society. They can produce potentially dangerous earthquakes. They can also act as pathways for magmas and hydrothermal fluids, leading to the formation of volcanoes, geothermal systems and mineral deposits. However, the manifestations of these very old faults in the present-day surface can be very subtle. Here, we present a detailed, multi-disciplinary study of a fault system of this type in the Andes of central Chile.
Antonin Bilau, Yann Rolland, Stéphane Schwartz, Nicolas Godeau, Abel Guihou, Pierre Deschamps, Benjamin Brigaud, Aurélie Noret, Thierry Dumont, and Cécile Gautheron
Solid Earth, 12, 237–251, https://doi.org/10.5194/se-12-237-2021, https://doi.org/10.5194/se-12-237-2021, 2021
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As a result of the collision between the European and Apulian plates, the Alps have experienced several evolutionary stages. The Penninic frontal thrust (PFT) (major thrust) was associated with compression, and now seismic studies show ongoing extensional activity. Calcite mineralization associated with shortening and extensional structures was sampled. The last deformation stages are dated by U–Pb on calcite at ~ 3.5 and ~ 2.5 Ma. Isotope analysis evidences deep crustal fluid mobilization.
Kathryn E. Elphick, Craig R. Sloss, Klaus Regenauer-Lieb, and Christoph E. Schrank
Solid Earth, 12, 141–170, https://doi.org/10.5194/se-12-141-2021, https://doi.org/10.5194/se-12-141-2021, 2021
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We analysed a sedimentary rock package located in Castlepoint, New Zealand, to test the control of the tectonic setting on the observed deformation structures. In extension and contraction, we observed faults and small fault-like structures characterised by complex spatial patterns and a reduction in porosity and grain size compared with the host rock. With these properties, the structures are likely to act as barriers to fluid flow and cause compartmentalisation of the sedimentary sequence.
Penelope I. R. Wilson, Robert W. Wilson, David J. Sanderson, Ian Jarvis, and Kenneth J. W. McCaffrey
Solid Earth, 12, 95–117, https://doi.org/10.5194/se-12-95-2021, https://doi.org/10.5194/se-12-95-2021, 2021
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Magma accommodation in the shallow crust leads to deformation of the surrounding host rock through the creation of faults, fractures and folds. This deformation will impact fluid flow around intrusive magma bodies (including sills and laccoliths) by changing the porosity and permeability network of the host rock. The results may have important implications for industries where fluid flow within the subsurface adds value (e.g. oil and gas, hydrology, geothermal and carbon sequestration).
Martin Balcewicz, Benedikt Ahrens, Kevin Lippert, and Erik H. Saenger
Solid Earth, 12, 35–58, https://doi.org/10.5194/se-12-35-2021, https://doi.org/10.5194/se-12-35-2021, 2021
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The geothermal potential of a carbonate reservoir in the Rhine-Ruhr area, Germany, was investigated by field and laboratory investigations. The carbonate layer of interest is approx. 150 m thick; located at 4 to 6 km depth; and might extend below Essen, Bochum, and Dortmund. We proposed focusing on discontinuities striking NNW–SSE for geothermal applications, as these are the most common, strike in the direction of the main horizontal stress, and dominate reservoir fluid flow.
Andrea Bistacchi, Silvia Mittempergher, Mattia Martinelli, and Fabrizio Storti
Solid Earth, 11, 2535–2547, https://doi.org/10.5194/se-11-2535-2020, https://doi.org/10.5194/se-11-2535-2020, 2020
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We present an innovative workflow for the statistical analysis of fracture data collected along scanlines. Our methodology is based on performing non-parametric statistical tests, which allow detection of important features of the spatial distribution of fractures, and on the analysis of the cumulative spacing function (CSF) and cumulative spacing derivative (CSD), which allows the boundaries of stationary domains to be defined in an objective way.
Martina Kirilova, Virginia Toy, Katrina Sauer, François Renard, Klaus Gessner, Richard Wirth, Xianghui Xiao, and Risa Matsumura
Solid Earth, 11, 2425–2438, https://doi.org/10.5194/se-11-2425-2020, https://doi.org/10.5194/se-11-2425-2020, 2020
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Processes associated with open pores can change the physical properties of rocks and cause earthquakes. In borehole samples from the Alpine Fault zone, we show that many pores in these rocks were filled by weak materials that can slide easily. The amount of open spaces was thus reduced, and fluids circulating within them built up high pressures. Both weak materials and high pressures within pores reduce the rock strength; thus the state of pores here can trigger the next Alpine Fault earthquake.
José Manuel Benítez-Pérez, Pedro Castiñeiras, Juan Gómez-Barreiro, José R. Martínez Catalán, Andrew Kylander-Clark, and Robert Holdsworth
Solid Earth, 11, 2303–2325, https://doi.org/10.5194/se-11-2303-2020, https://doi.org/10.5194/se-11-2303-2020, 2020
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The Sobrado unit represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust. We have combined U–Pb geochronology and REE analyses (LASS-ICP-MS) of accessory minerals in migmatitic paragneiss (monazite, zircon) and mylonitic amphibolites (titanite) to constrain the evolution. A Middle Devonian minimum age for HP metamorphism has been obtained.
Anna M. Dichiarante, Ken J. W. McCaffrey, Robert E. Holdsworth, Tore I. Bjørnarå, and Edward D. Dempsey
Solid Earth, 11, 2221–2244, https://doi.org/10.5194/se-11-2221-2020, https://doi.org/10.5194/se-11-2221-2020, 2020
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We studied the characteristics of fracture systems in the Devonian rocks of the Orcadian Basin in Caithness. These mineral-filled fractures have properties that may be used to predict the size and spatial arrangement of similar structures in offshore basins. This includes the Clair field in the Faroe–Shetland Basin.
Leonardo Del Sole, Marco Antonellini, Roger Soliva, Gregory Ballas, Fabrizio Balsamo, and Giulio Viola
Solid Earth, 11, 2169–2195, https://doi.org/10.5194/se-11-2169-2020, https://doi.org/10.5194/se-11-2169-2020, 2020
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This study focuses on the impact of deformation bands on fluid flow and diagenesis in porous sandstones in two different case studies (northern Apennines, Italy; Provence, France) by combining a variety of multiscalar mapping techniques, detailed field and microstructural observations, and stable isotope analysis. We show that deformation bands buffer and compartmentalize fluid flow and foster and localize diagenesis, recorded by carbonate cement nodules spatially associated with the bands.
Billy James Andrews, Zoe Kai Shipton, Richard Lord, and Lucy McKay
Solid Earth, 11, 2119–2140, https://doi.org/10.5194/se-11-2119-2020, https://doi.org/10.5194/se-11-2119-2020, 2020
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Through geological mapping we find that fault zone internal structure depends on whether or not the fault cuts multiple lithologies, the presence of shale layers, and the orientation of joints and coal cleats at the time of faulting. During faulting, cementation of fractures (i.e. vein formation) is highest where the fractures are most connected. This leads to the counter-intuitive result that the highest-fracture-density part of the network often has the lowest open-fracture connectivity.
Nicolas Mansard, Holger Stünitz, Hugues Raimbourg, Jacques Précigout, Alexis Plunder, and Lucille Nègre
Solid Earth, 11, 2141–2167, https://doi.org/10.5194/se-11-2141-2020, https://doi.org/10.5194/se-11-2141-2020, 2020
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Our rock deformation experiments (solid-medium Griggs-type apparatus) on wet assemblages of mafic compositions show that the ability of minerals to react controls the portions of rocks that deform and that minor chemical and mineralogical variations can considerably modify the strength of deformed assemblages. Our study suggests that the rheology of mafic rocks, which constitute a large part of the oceanic crust, cannot be summarized as being rheologically controlled by monophase materials.
Vladimir Shipilin, David C. Tanner, Hartwig von Hartmann, and Inga Moeck
Solid Earth, 11, 2097–2117, https://doi.org/10.5194/se-11-2097-2020, https://doi.org/10.5194/se-11-2097-2020, 2020
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In our work, we carry out an in-depth structural analysis of a geometrically decoupled fault system in the southern German Molasse Basin using a high-resolution 3-D seismic dataset. Based on this analysis, we reconstruct the tectonic history and changes in the stress regimes to explain the structure and evolution of faults. The results contribute in understanding the driving mechanisms behind formation, propagation, and reactivation of faults during foreland basin formation.
Eric Salomon, Atle Rotevatn, Thomas Berg Kristensen, Sten-Andreas Grundvåg, Gijs Allard Henstra, Anna Nele Meckler, Richard Albert, and Axel Gerdes
Solid Earth, 11, 1987–2013, https://doi.org/10.5194/se-11-1987-2020, https://doi.org/10.5194/se-11-1987-2020, 2020
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This study focuses on the impact of major rift border faults on fluid circulation and hanging wall sediment diagenesis by investigating a well-exposed example in NE Greenland using field observations, U–Pb calcite dating, clumped isotope, and minor element analyses. We show that fault-proximal sediments became calcite cemented quickly after deposition to form a near-impermeable barrier along the fault, which has important implications for border fault zone evolution and reservoir assessments.
Nick M. W. Roberts, Jack K. Lee, Robert E. Holdsworth, Christopher Jeans, Andrew R. Farrant, and Richard Haslam
Solid Earth, 11, 1931–1945, https://doi.org/10.5194/se-11-1931-2020, https://doi.org/10.5194/se-11-1931-2020, 2020
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We characterise a well-known fractured and faulted exposure of Cretaceous chalk in NE England, combining field observations with novel U–Pb calcite dating. We show that the faulting and associated fluid flow occurred during the interval of ca. 64–56 Ma, predating earlier estimates of Alpine-related tectonic inversion. We demonstrate that the main extensional fault zone acted as a conduit linking voluminous fluid flow and linking deeper sedimentary layers with the shallow subsurface.
Melchior Schuh-Senlis, Cedric Thieulot, Paul Cupillard, and Guillaume Caumon
Solid Earth, 11, 1909–1930, https://doi.org/10.5194/se-11-1909-2020, https://doi.org/10.5194/se-11-1909-2020, 2020
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This paper presents a numerical method for restoring models of the subsurface to a previous state in their deformation history, acting as a numerical time machine for geological structures. The method relies on the assumption that rock layers can be modeled as highly viscous fluids. It shows promising results on simple setups, including models with faults and non-flat topography. While issues still remain, this could open a way to add more physics to reverse time structural modeling.
Gábor Tari, Didier Arbouille, Zsolt Schléder, and Tamás Tóth
Solid Earth, 11, 1865–1889, https://doi.org/10.5194/se-11-1865-2020, https://doi.org/10.5194/se-11-1865-2020, 2020
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Inversion tectonics has been studied in detail by both academic researchers and industry experts around the world for the last 30 years. Inverted structures provide important traps for petroleum exploration which can be categorized into two end-member modes of evolution. This paper attempts to provide a brief synoptic view of inversion tectonics from the point of view of the petroleum industry, emphasizing the main subsurface challenges of understanding this structural geology phenomenon.
Elizabeth S. Petrie, Kelly K. Bradbury, Laura Cuccio, Kayla Smith, James P. Evans, John P. Ortiz, Kellie Kerner, Mark Person, and Peter Mozley
Solid Earth, 11, 1803–1821, https://doi.org/10.5194/se-11-1803-2020, https://doi.org/10.5194/se-11-1803-2020, 2020
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A summary of observed rock properties across the contact between crystalline basement rock and the overlying younger sedimentary rocks from outcrop and core samples is presented. The data span a range of tectonic settings and describe the rock types immediately adjacent to the contact. The range of features observed at these contacts can influence the migration of fluids. The observations presented here are critical for the safe implementation of fluid injection and geothermal production.
Christopher Weismüller, Rahul Prabhakaran, Martijn Passchier, Janos L. Urai, Giovanni Bertotti, and Klaus Reicherter
Solid Earth, 11, 1773–1802, https://doi.org/10.5194/se-11-1773-2020, https://doi.org/10.5194/se-11-1773-2020, 2020
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We photographed a fractured limestone pavement with a drone to compare manual and automatic fracture tracing and analyze the evolution and spatial variation of the fracture network in high resolution. We show that automated tools can produce results comparable to manual tracing in shorter time but do not yet allow the interpretation of fracture generations. This work pioneers the automatic fracture mapping of a complete outcrop in detail, and the results can be used as fracture benchmark.
Romesh Palamakumbura, Maarten Krabbendam, Katie Whitbread, and Christian Arnhardt
Solid Earth, 11, 1731–1746, https://doi.org/10.5194/se-11-1731-2020, https://doi.org/10.5194/se-11-1731-2020, 2020
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The aim of this paper is to describe, evaluate and develop a simple but robust low-cost method for capturing 2-D fracture network data in GIS and make them more accessible to a broader range of users in both academia and industry. We present a breakdown of the key steps in the methodology, which provides an understanding of how to avoid error and improve the accuracy of the final dataset. The 2-D digital method can be used to interpret traces of 2-D linear features on a wide variety of scales.
I. Tonguç Uysal, Claudio Delle Piane, Andrew James Todd, and Horst Zwingmann
Solid Earth, 11, 1653–1679, https://doi.org/10.5194/se-11-1653-2020, https://doi.org/10.5194/se-11-1653-2020, 2020
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This study represents an integrated approach to radiometric age dating using potassium-bearing clay minerals formed during faulting and provides insights into the enigmatic time–space distribution of Precambrian tectonic zones in north-central Australia. Specifically, our work firmly indicates a late Mesoproterzoic minimum age for the Millungera Basin in north Australia and a previously unrecorded concealed late Mesoproterozoic–early Neoproterozoic tectonic event in north-central Australia.
Stefano Tavani, Pablo Granado, Amerigo Corradetti, Thomas Seers, Josep Maria Casas, and Josep Anton Muñoz
Solid Earth, 11, 1643–1651, https://doi.org/10.5194/se-11-1643-2020, https://doi.org/10.5194/se-11-1643-2020, 2020
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Using orthophotos, we manually digitized 30 000 joints in the eastern Ebro Basin of the Pyrenees. Joints are perpendicular to the belt in the frontal portion of the belt and in the inner and central portion of the foredeep basin. Joint orientations in the external portion of the foredeep become less clustered. Joints in the studied area formed in the foredeep in response to foredeep-parallel stretching, which becomes progressively less intense within the external portion of the foredeep basin.
Nicolas E. Beaudoin, Aurélie Labeur, Olivier Lacombe, Daniel Koehn, Andrea Billi, Guilhem Hoareau, Adrian Boyce, Cédric M. John, Marta Marchegiano, Nick M. Roberts, Ian L. Millar, Fanny Claverie, Christophe Pecheyran, and Jean-Paul Callot
Solid Earth, 11, 1617–1641, https://doi.org/10.5194/se-11-1617-2020, https://doi.org/10.5194/se-11-1617-2020, 2020
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This paper reports a multiproxy approach to reconstruct the depth, timing, and extent of the past fluid flow during the formation of a fold-and-thrust belt in the Northern Apennines, Italy. The unique combination of paleopiezometry and absolute dating returns the absolute timing of the sequence of deformation. Combined with burial models, this leads to predict the expected temperatures for fluid, highlighting a limited hydrothermal fluid flow we relate to the large-scale subsurface geometry.
Thomas B. Phillips, Christopher A.-L. Jackson, and James R. Norcliffe
Solid Earth, 11, 1489–1510, https://doi.org/10.5194/se-11-1489-2020, https://doi.org/10.5194/se-11-1489-2020, 2020
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Normal faults often reactivate under compression, in a process called inversion. The 3D geometry of these structures (and the effect on resultant inversion structural style) is often not considered. Using seismic reflection data, we examine how stresses form different inversion styles that are controlled by the geometry of the pre-existing structure. Geometrically simple faults are preferentially reactivated; more complex areas are typically not reactivated and instead experience bulk uplift.
Ashton Krajnovich, Wendy Zhou, and Marte Gutierrez
Solid Earth, 11, 1457–1474, https://doi.org/10.5194/se-11-1457-2020, https://doi.org/10.5194/se-11-1457-2020, 2020
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In this paper, a novel methodology of 3D geologic model uncertainty assessment that considers both input data and prior knowledge is developed and applied to characterize fault zones – areas of damaged rock surrounding a fault surface that are important to subsurface engineering projects. The results of the study demonstrate how existing frameworks can be expanded to incorporate new types of information to arrive at a realistic and straightforward model of fault zone geometry in the subsurface.
Cited articles
Adam, L., Toy, V., and Boulton, C.: Mylonites as shales? Experimental observations of P-wave anisotropy dependence on mineralogy, layering and scale, in: SEG Technical Program Expanded Abstracts 2016, 3169–3173, Society of Exploration Geophysicists, 2016.
Allen, M. J., Tatham, D., Faulkner, D. R., Mariani, E., and Boulton, C.: Permeability and seismic velocity and their anisotropy across the Alpine Fault, New Zealand: An insight from laboratory measurements on core from the Deep Fault Drilling Project phase 1 (DFDP-1), J. Geophys.-Res.-Sol. Ea., 122, 6160–6179, https://doi.org/10.1002/2017JB014355, 2017.
Ampuero, J. P. and Mao, X.: Upper limit on damage zone thickness controlled by seismogenic depth, Fault Zo. Dyn. Process. Evol. Fault Prop. Dur. Seism. Rupture, 227, 243–253, 2017.
Andrews, D. J.: Rupture dynamics with energy loss outside the slip zone, J. Geophys.-Res.-Sol. Ea., 110, 1–14, https://doi.org/10.1029/2004JB003191, 2005.
Barth, N. C., Toy, V. G., Langridge, R. M., and Norris, R. J.: Scale dependence of oblique plate-boundary partitioning: New insights from LiDAR, central Alpine fault, New Zealand, Lithosphere, 4, 435–448, https://doi.org/10.1130/L201.1, 2012.
Barth, N. C., Boulton, C., Carpenter, B. M., Batt, G. E., and Toy, V. G.: Slip localization on the southern Alpine Fault New Zealand, Tectonics, 32, 620–640, https://doi.org/10.1002/tect.20041, 2013.
Ben-Zion, Y. and Sammis, C. G.: Characterization of Fault Zones, Pure Appl. Geophys., 160, 677–715, https://doi.org/10.1007/PL00012554, 2003.
Berg, S. S. and Skar, T.: Controls on damage zone asymmetry of a normal fault zone: Outcrop analyses of a segment of the Moab fault, SE Utah, J. Struct. Geol., 27, 1803–1822, https://doi.org/10.1016/j.jsg.2005.04.012, 2005.
Bistacchi, A., Massironi, M., and Menegon, L.: Three-dimensional characterization of a crustal-scale fault zone: The Pusteria and Sprechenstein fault system (Eastern Alps), J. Struct. Geol., 32, 2022–2041, https://doi.org/10.1016/j.jsg.2010.06.003, 2010.
Bistacchi, A., Massironi, M., Menegon, L., Bolognesi, F., and Donghi, V.: On the nucleation of non-Andersonian faults along phyllosilicate-rich mylonite belts, Geol. Soc. London, Spec. Publ., 367, 185–199, https://doi.org/10.1144/sp367.13, 2012.
Boese, C. M. M., Townend, J., Smith, E., and Stern, T.: Microseismicity and stress in the vicinity of the Alpine Fault, central Southern Alps, New Zealand, J. Geophys.-Res.-Sol. Ea., 117, B02302, https://doi.org/10.1029/2011JB008460, 2012.
Boulton, C., Yao, L., Faulkner, D. R., Townend, J., Toy, V. G., Sutherland, R., Ma, S., and Shimamoto, T.: High-velocity frictional properties of Alpine Fault rocks: Mechanical data, microstructural analysis, and implications for rupture propagation, J. Struct. Geol., 97, 71–92, https://doi.org/10.1016/j.jsg.2017.02.003, 2017.
Boulton, C. J., Carpenter, B. M., Toy, V., and Marone, C.: Physical properties of surface outcrop cataclastic fault rocks, Alpine Fault, New Zealand, Geochem., Geophy. Geosy., 13, Q01018, https://doi.org/10.1029/2011GC003872, 2012.
Caine, J. S., Evans, J. P., and Forster, C. B.: Fault zone architecture and permeability structure, Geology, 24, 1025–1028, 1996.
Chamberlain, C. J., Boese, C. M., and Townend, J.: Cross-correlation-based detection and characterisation of microseismicity adjacent to the locked, late-interseismic Alpine Fault, South Westland, New Zealand, Earth Planet. Sci. Lett., 457, 63–72, https://doi.org/10.1016/j.epsl.2016.09.061, 2017.
Chester, F. M. and Chester, J. S.: Stress and deformation along wavy frictional faults, J. Geophys. Res., 105, 23421, https://doi.org/10.1029/2000JB900241, 2000.
Chester, F. M. and Logan, J. M.: Implications for mechanical properties of brittle faults from observations of the Punchbowl fault zone, California, Pure Appl. Geophys. PAGEOPH, 124, 79–106, https://doi.org/10.1007/BF00875720, 1986.
Chester, F. M., Evans, J. P., and Biegel, R. L.: Internal structure and weakening mechanisms of the San Andreas Fault, J. Geophys. Res., 98, 771, https://doi.org/10.1029/92JB01866, 1993.
Chester, J. S. and Fletcher, R. C.: Stress distribution and failure in anisotropic rock near a bend on a weak fault, J. Geophys. Res.-Earth, 102, 693–708, https://doi.org/10.1029/96JB02791, 1997.
Choi, J. H., Edwards, P., Ko, K., and Kim, Y. S.: Definition and classification of fault damage zones: A review and a new methodological approach, Earth-Science Rev., 152, 70–87, https://doi.org/10.1016/j.earscirev.2015.11.006, 2016.
Christensen, N. I. and Okaya, D. A.: Compressional and shear wave velocities in South Island, New Zealand rocks and their application to the interpretation of seismological models of the New Zealand crust, A Cont. Plate Bound. Tectonics South Island, New Zeal., 123–155, 2007.
Columbus, J., Sirguey, P., and Tenzer, R.: A free, fully assessed 15-m DEM for New Zealand, Surv. Q., 66, 16–19, 2011.
Cooper, A. F. and Norris, R. J.: Anatomy, structural evolution, and slip rate of a plate-boundary thrust: the Alpine Fault at Gaunt Creek, Westland, New Zealand, Geol. Soc. Am. Bull., 106, 627–633, https://doi.org/10.1130/0016-7606(1994)106<0627:ASEASR>2.3.CO;2, 1994.
Cooper, A. F. and Norris, R. J.: Inverted metamorphic sequences in Alpine fault mylonites produced by oblique shear within a plate boundary fault zone, Geology, New Zealand, 39, 1023–1026, 2011.
Cowie, P. A. and Scholz, C. H.: Physical Explanation for the Displacement Length Relationship of Faults Using a Post-Yield Fracture-Mechanics Model, J. Struct. Geol., 14, 1133–1148, https://doi.org/10.1016/0191-8141(92)90065-5, 1992.
Cox, S., and Barrel, D. J. A.: Geology of the Aoraki area, Institute of Geological and Nuclear Sciences, 1:250 000 Geological Map, Lower Hutt, New Zealand (GNS Science), 71, 2007.
Cox, S. C., Menzies, C. D., Sutherland, R., Denys, P. H., Chamberlain, C., and Teagle, D. A. H.: Changes in hot spring temperature and hydrogeology of the Alpine Fault hanging wall, New Zealand, induced by distal South Island earthsquakes, Geofluids, 15, 216–239, 2015.
DeMets, C., Gordon, R. G., Argus, D. F., and Stein, S.: Effect of recent revisions to the geomagnetic reversal time scale on estimate of current plate motions, Geophys. Res. Lett., 21, 2191–2194, https://doi.org/10.1029/94GL02118, 1994.
Donath, F. A.: Experimental study of shear failure in anisotropic rocks, Geol. Soc. Am. Bull., 72, 985–989, https://doi.org/10.1130/0016-7606(1961)72[985:ESOSFI]2.0.CO;2, 1961.
Eberhart-Phillips, D., Stanley, W. D., Rodriguez, B. D., and Lutter, W. J.: Surface seismic and electrical methods to detect fluids related to faulting, J. Geophys. Res., 100, 12919–12936, https://doi.org/10.1029/94JB03256, 1995.
Eberhart-Phillips, D.: Examination of seismicity in the central Alpine fault region, South Island, New Zealand, New Zeal. J. Geol. Geophys., 38, 571–578, 1995.
Eccles, J. D., Gulley, A. K., Malin, P. E., Boese, C. M., Townend, J., and Sutherland, R.: Fault Zone Guided Wave generation on the locked, late interseismic Alpine Fault, New Zealand, Geophys. Res. Lett., 42, 5736–5743, https://doi.org/10.1002/2015GL064208, 2015.
Ellsworth, W. L. and Malin, P. E.: Deep rock damage in the San Andreas Fault revealed by P- and S-type fault-zone-guided waves, in: Geol. Earthq. Source A Vol. Honor Rick Sibson, edited by: Fagereng, A., Toy, V. G., and Rowland, J., Geol. Soc. London, Spec. Publ., 359, 39–53, https://doi.org/10.1144/SP359.3, 2011.
Engelder, T.: Loading paths to joint propagation during a tectonic cycle: an example from the Appalachian Plateau, U.S.A., J. Struct. Geol., 7, 459–476, https://doi.org/10.1016/0191-8141(85)90049-5, 1985.
Faulkner, D. R., Jackson, C. A. L., Lunn, R. J., Schlische, R. W., Shipton, Z. K., Wibberley, C. A. J., and Withjack, M. O.: A review of recent developments concerning the structure, mechanics and fluid flow properties of fault zones, J. Struct. Geol., 32, 1557–1575, https://doi.org/10.1016/j.jsg.2010.06.009, 2010.
Faulkner, D. R., Mitchell, T. M., Jensen, E., and Cembrano, J.: Scaling of fault damage zones with displacement and the implications for fault growth processes, J. Geophys.-Res.-Sol. Ea., 116, B05403, https://doi.org/10.1029/2010JB007788, 2011.
Finzi, Y., Hearn, E. H., Ben-Zion, Y., and Lyakhovsky, V.: Structural properties and deformation patterns of evolving strike-slip faults: Numerical simulations incorporating damage rheology, Pure Appl. Geophys., 166, 1537–1573, https://doi.org/10.1007/s00024-009-0522-1, 2009.
Haggas, S., Brewer, T. S., Harvey, P. K., and Iturrino, G. I.: Relocating and orientating cores by the integration of electrical and optical images, J. Geol. Soc. London, 158, 615–623, https://doi.org/10.1144/jgs.158.4.615, 2001.
Ikari, M. J., Carpenter, B. M., Kopf, A. J., and Marone, C.: Frictional strength, rate-dependence, and healing in DFDP-1 borehole samples from the Alpine Fault, New Zealand, Tectonophysics, 630, 1–8, https://doi.org/10.1016/j.tecto.2014.05.005, 2014.
Jarrard, R. D., Paulsen, T. S., and Wilson, T. J.: Orientation of CRP-3 core, Victoria Land Basin, Antarctica, Terra Antarct., 8, 161–166, 2001.
Kim, Y. S. and Sanderson, D. J.: Fault propagation, displacement and damage zones, Struct. Geol. New Res., 1, 99–117, 2008.
Kim, Y. S., Peacock, D. C. P., and Sanderson, D. J.: Fault damage zones, J. Struct. Geol., 26, 503–517, https://doi.org/10.1016/j.jsg.2003.08.002, 2004.
Kulander, B. R., Dean, S. L., and Ward, B. J.: Fracture core analysis: interpretation, logging and use of natural and induced fractures in core, vol. 8, American Association of Petroleum Geologists, 88 pp., 1990.
Langridge, R. M., Ries, W. F., Farrier, T., Barth, N. C., Khajavi, N., and De Pascale, G. P.: Developing sub 5-m LiDAR DEMs for forested sections of the Alpine and Hope faults, South Island, New Zealand: Implications for structural interpretations, J. Struct. Geol., 64, 53–66, https://doi.org/10.1016/j.jsg.2013.11.007, 2014.
Lees, J. M.: RFOC: Graphics for spherical distributions and earthquake focal mechanisms, R package version 3.3-3, available at: http://CRAN.R-project.org/package=RFOC (last access: 18 April 2018), R Packag. version, 3, 2014.
Li, Y. G., De Pascale, G. P., Quigley, M. C., and Gravley, D. M.: Fault damage zones of the M7.1 Darfield and M6.3 Christchurch earthquakes characterized by fault-zone trapped waves, Tectonophysics, 618, 79–101, https://doi.org/10.1016/j.tecto.2014.01.029, 2014.
Little, T. A., Cox, S., Vry, J. K., and Batt, G.: Variations in exhumation level and uplift rate along the obliqu-slip Alpine fault, central Southern Alps, New Zealand, Geol. Soc. Am. Bull., 117, 707–723, https://doi.org/10.1130/B25500.1, 2005.
Lund Snee, J. E., Toy, V. G., and Gessner, K.: Significance of brittle deformation in the footwall of the Alpine Fault, New Zealand: Smithy Creek Fault zone, J. Struct. Geol., 64, 79–98, https://doi.org/10.1016/j.jsg.2013.06.002, 2014.
Ma, S.: Distinct asymmetry in rupture-induced inelastic strain across dipping faults: An off-fault yielding model, Geophys. Res. Lett., 36, L20317, https://doi.org/10.1029/2009GL040666, 2009.
Manning, C. E. and Ingebritsen, S. E.: Permeability of the continental crust: Implications of geothermal data and metamorphic systems, Rev. Geophys., 37, 127–150, https://doi.org/10.1029/1998RG900002, 1999.
Massiot, C.: Fracture system characterisation and implications for fluid flow in volcanic and metamorphic rocks, available at: http://hdl.handle.net/10063/6194 (last access: 18 April 2018), 1–191, 2017.
Massiot, C., Mcnamara, D. D., and Lewis, B.: Geothermics Processing and analysis of high temperature geothermal acoustic borehole image logs in the Taupo Volcanic Zone, New Zealand, Geothermics, 53, 190–201, https://doi.org/10.1016/j.geothermics.2014.05.010, 2015.
Massironi, M., Bistacchi, A., and Menegon, L.: Misoriented faults in exhumed metamorphic complexes: Rule or exception?, Earth Planet. Sci. Lett., 307, 233–239, https://doi.org/10.1016/j.epsl.2011.04.041, 2011.
Mauldon, M., Dunne, W. M., and Rohrbaugh, M. B.: Circular scanlines and circular windows: New tools for characterizing the geometry of fracture traces, J. Struct. Geol., 23, 247–258, https://doi.org/10.1016/S0191-8141(00)00094-8, 2001.
McCahon, I.: Amethyst Hydro Scheme 2006 Drilling Investigation Summary Report, Prepared by Geotech Consulting Company Limited for Westpower Limited, GNS Science library, No. 2745, 41 pp., 2006.
McNamara, D.: Exploring New Zealand's subsurface using borehole images, in Presented at the 2015 New Zealand Geosciences Conference, Wellington, 25–27th November, 2015.
Mills, S. and Williams, J. N.: Generating circumferential images of tomographic drill-core scans, GFZ Data Serv., available at: https://doi.org/10.5880/ICDP.5052.005 (last access: 18 April 2018), 2017.
Misra, S., Ellis, S., and Mandal, N.: Fault damage zones in mechanically layered rocks: The effects of planar anisotropy, J. Geophys. Res., 120, 5432–5452, https://doi.org/10.1002/2014JB011780, 2015.
Mitchell, T. M. and Faulkner, D. R.: The nature and origin of off-fault damage surrounding strike-slip fault zones with a wide range of displacements: A field study from the Atacama fault system, northern Chile, J. Struct. Geol., 31, 802–816, https://doi.org/10.1016/j.jsg.2009.05.002, 2009.
Mitchell, T. M. and Toy, V. G.: Photograph of the month, J. Struct. Geol., 64, iii, https://doi.org/10.1016/S0191-8141(14)00094-7, 2014.
Muir-Wood, R. and King, G. C. P.: Hydrological signatures of earthquake strain, J. Geophys. Res., 98, 22035, https://doi.org/10.1029/93JB02219, 1993.
Nasseri, M. H. B., Rao, K. S., and Ramamurthy, T.: Anisotropic strength and deformation behavior of Himalayan schists, Int. J. Rock Mech. Min. Sci., 40, 3–23, https://doi.org/10.1016/S1365-1609(02)00103-X, 2003.
Norris, R. J. and Cooper, A. F.: Origin of small-scale segmentation and transpressional thrusting along the Alpine Fault, New Zealand, Geol. Soc. Am. Bull., 107, 231–240, https://doi.org/10.1130/0016-7606(1995)107<0231:OOSSSA>2.3.CO;2, 1995.
Norris, R. J. and Cooper, A. F.: Erosional control on the structural evolution of a transpressional thrust complex on the Alpine fault, New Zealand, J. Struct. Geol., 19, 1323–1342, https://doi.org/10.1016/S0191-8141(97)00036-9, 1997.
Norris, R. J. and Cooper, A. F.: Late Quaternary slip rates and slip-partitioning on the Alpine Fault, New Zealand, J. Struct. Geol., 23, 507–520, 2001.
Norris, R. J. and Cooper, A. F.: Very high strains recorded in mylonites along the Alpine Fault, New Zealand: implications for the deep structure of plate boundary faults, J. Struct. Geol., 25, 2141–2157, 2003.
Norris, R. J. and Cooper, A. F.: The Alpine Fault, New Zealand: Surface Geology and Field Relationships, in: A Continental Plate Boundary: Tectonics at South Island, New Zealand, edited by: Okaya, D., Stern, T. A., and Davey, F., 157–175, American Geophysical Union, https://doi.org/10.1029/175GM09, 2007.
Norris, R. J. and Toy, V. G.: Continental transforms: A view from the Alpine Fault, J. Struct. Geol., 64, 3–31, https://doi.org/10.1016/j.jsg.2014.03.003, 2014.
O'Brien, G. A., Cox, S. C., and Townend, J.: Spatially and temporally systematic hydrologic changes within large geoengineered landslides, Cromwell Gorge, New Zealand, induced by multiple regional earthquakes, J. Geophys.-Res.-Sol. Ea., 121, 8750–8773, 2016.
Paterson, M. S. and Wong, T. F.: Experimental rock deformation – The brittle field, Springer-Verlag Berlin Heidelberg, 2005.
Paulsen, T. S., Jarrard, R. D., and Wilson, T. J.: A simple method for orienting drill core by correlating features in whole-core scans and oriented borehole-wall imagery, J. Struct. Geol., 24, 1233–1238, https://doi.org/10.1016/S0191-8141(01)00133-X, 2002.
Peacock, D. C. P. and Sanderson, D. J.: Effects of layering and anisotropy on fault geometry, J. Geol. Soc. London, 149, 793–802, https://doi.org/10.1144/gsjgs.149.5.0793, 1992.
Price, N. J.: Mechanics of jointing in rocks, Geol. Mag., 96, 149–167, https://doi.org/10.1017/S0016756800060040, 1959.
Priest, S.: Discontinuity Analysis for Rock Engineering, Springer Science & Business Media, 1993.
Rattenbury, M. and Isaac, M.: The QMAP 1:250 000 Geological Map of New Zealand project, New Zeal. J. Geol. Geophys., 8306, https://doi.org/10.1080/00288306.2012.725417, 55, 393–405, 2012.
Reed, J. J.: Mylonites, cataclasites, and associated rocks along the Alpine fault, South Island, New Zealand, New Zeal. J. Geol. Geophys., 7, 645–684, https://doi.org/10.1080/00288306.1964.10428124, 1964.
Rice, J. R., Sammis, C. G., and Parsons, R.: Off-fault secondary failure induced by a dynamic slip pulse, Bull. Seismol. Soc. Am., 95, 109–134, https://doi.org/10.1785/0120030166, 2005.
Savage, E.: Investigating Rock Mass Conditions and Implications for Tunnelling and Construction of the Amethyst Hydro Project, Harihari, University of Canterbury, 2013.
Savage, H. M. and Brodsky, E. E.: Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones, J. Geophys.-Res.-Sol. Ea., 116, B03405, https://doi.org/10.1029/2010JB007665, 2011.
Savage, H. M., Keranen, K. M., Schaff, D., and Dieck, C.: Possible Precursory Signals in Damage Zone Foreshocks, Geophys. Res. Lett., 4, 5411–5417, 2017.
Schulz, S. E. and Evans, J. P.: Mesoscopic structure of the Punchbowl Fault, Southern California and the geologic and geophysical structure of active strike-slip faults, J. Struct. Geol., 22, 913–930, https://doi.org/10.1016/S0191-8141(00)00019-5, 2000.
Shigematsu, N., Otsubo, M., Fujimoto, K., and Tanaka, N.: Orienting drill core using borehole-wall image correlation analysis, J. Struct. Geol., 67, 293–299, https://doi.org/10.1016/j.jsg.2014.01.016, 2014.
Sibson, R. H.: Earthquake faulting as a structural process, J. Struct. Geol., 11, 1–14, https://doi.org/10.1016/0191-8141(89)90032-1, 1989.
Sibson, R. H., White, S. H., and Atkinson, B. K.: Structure and distribution of fault rocks in the Alpine Fault Zone, New Zealand, Geol. Soc. London, Spec. Publ., 9, 197–210, 1981.
Simpson, G. D. H., Cooper, A. F., and Norris, R. J.: Late Quaternary evolution of the Alpine Fault Zone at Paringa, South Westland, New Zealand, New Zeal. J. Geol. Geophys., 37, 49–58, https://doi.org/10.1080/00288306.1994.9514600, 1994.
Stanley, C. R. and Hooper, J. J.: POND: An Excel spreadsheet to obtain structural attitudes of planes from oriented drillcore, Comput. Geosci., 29, 531–537, https://doi.org/10.1016/S0098-3004(03)00033-5, 2003.
Stern, T., Okaya, D., Kleffmann, S., Scherwath, M., Henrys, S., and Davey, F.: Geophysical exploration and dynamics of the Alpine Fault Zone, A Cont. Plate Bound. Tectonics South Island, New Zeal. Geophys. Monogr. Ser., 175, 207–233, https://doi.org/10.1029/175GM11, 2007.
Sutherland, R., Eberhart-Phillips, D., Harris, R. A., Stern, T., Beavan, J., Ellis, S., Henrys, S., Cox, S., Norris, R. J., Berryman, K. R., Townend, J., Bannister, S., Pettinga, J., Leitner, B., Wallace, L., Little, T. A., Cooper, A. F., Yetton, M., and Stirling, M.: Do Great Earthquakes Occur on the Alpine Fault in Central South Island, New Zealand?, in: A Continental Plate Boundary: Tectonics at South Island, New Zealand, 175, edited by: Okaya, D., Stern, T., and Davey, F., 235–251, American Geophysical Union, https://doi.org/10.1029/175GM12, 2007.
Sutherland, R., Toy, V. G., Townend, J., Cox, S. C., Eccles, J. D., Faulkner, D. R., Prior, D. J., Norris, R. J., Mariani, E., Boulton, C., Carpenter, B. M., Menzies, C. D., Little, T. A., Hasting, M., De Pascale, G. P., Langridge, R. M., Scott, H. R., Reid Lindroos, Z., Fleming, B., and Kopf, J.: Drilling reveals fluid control on architecture and rupture of the Alpine fault, New Zealand, Geology, 40, 1143–1146, https://doi.org/10.1130/G33614.1, 2012.
Sutherland, R., Townend, J., Toy, V. G., Upton, P., Coussens, J., and DFDP2, S. T.: Extreme hydrothermal conditions at an active plate-bounding fault, Nature, 546, 137–140, https://doi.org/10.1038/nature22355, 2017.
Sylvester, A. G.: Strike-Slip Faults, Geol. Soc. Am. Bull., 100, 1666–1703, https://doi.org/10.1130/0016-7606(1988)100<1666:SSF>2.3.CO;2, 1988.
Templeton, E. L., Rice, J. R., Viesca, R. C., Templeton, E. L., and Rice, J. R.: Off-fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation, J. Geophys.-Res.-Sol. Ea., 113, https://doi.org/10.1029/2007JB005530, 2008.
Terzaghi, R. D.: Sources of Error in Joint Surveys, Géotechnique, 15, 287–304, https://doi.org/10.1680/geot.1965.15.3.287, 1965.
Tippett, J. M. and Kamp, P. J. J.: Quantitative relationships between uplift and relief parameters for the Southern Alps, New Zealand, as determined by fission track analysis, Earth Surf. Process. Landforms, 20, 153–175, 1995.
Townend, J. and Zoback, M. D.: How faulting keeps the crust strong, Geology, 28, 399–402, https://doi.org/10.1130/0091-7613(2000)28<399:HFKTCS>2.0.CO;2, 2000.
Townend, J., Sutherland, R., Toy, V. G., Eccles, J. D., Boulton, C., Cox, S. C., and McNamara, D.: Late-interseismic state of a continental plate-bounding fault: Petrophysical results from DFDP-1 wireline logging and core analysis, Alpine Fault, New Zealand, Geochem., Geophy. Geosy., 14, 3801–3820, https://doi.org/10.1002/ggge.20236, 2013.
Townend, J., Sutherland, R., Toy, V. G., Doan, M. L., Célérier, B., Massiot, C., Coussens, J., Jeppson, T., Janku-Capova, L., Remaud, L., Upton, P., Schmitt, D. R., Pezard, P., Williams, J., Allen, M. J., Baratin, L. M., Barth, N., Becroft, L., Boese, C. M., Boulton, C., Broderick, N., Carpenter, B., Chamberlain, C. J., Cooper, A., Coutts, A., Cox, S. C., Craw, L., Eccles, J. D., Faulkner, D., Grieve, J., Grochowski, J., Gulley, A., Hartog, A., Henry, G., Howarth, J., Jacobs, K., Kato, N., Keys, S., Kirilova, M., Kometani, Y., Langridge, R., Lin, W., Little, T., Lukacs, A., Mallyon, D., Mariani, E., Mathewson, L., Melosh, B., Menzies, C., Moore, J., Morales, L., Mori, H., Niemeijer, A., Nishikawa, O., Nitsch, O., Paris, J., Prior, D. J., Sauer, K., Savage, M. K., Schleicher, A., Shigematsu, N., Taylor-Offord, S., Teagle, D., Tobin, H., Valdez, R., Weaver, K., Wiersberg, T., and Zimmer, M.: Petrophysical, Geochemical, and Hydrological Evidence for Extensive Fracture-Mediated Fluid and Heat Transport in the Alpine Fault's Hanging-Wall Damage Zone, Geochem., Geophy. Geosy., 18, 4709–4732, https://doi.org/10.1002/2017GC007202, 2017.
Toy, V.: Rheology of the Alpine Fault mylonite zone: deformation processes at and below the base of the seismogenic zone in a major plate boundary structure, University of Otago, available at: http://hdl.handle.net/10523/4548 (last access: 18 April 2018), 2008.
Toy, V. G., Prior, D. J., and Norris, R. J.: Quartz fabrics in the Alpine Fault mylonites: Influence of pre-existing preferred orientations on fabric development during progressive uplift, J. Struct. Geol., 30, 602–621, https://doi.org/10.1016/j.jsg.2008.01.001, 2008.
Toy, V. G., Craw, D., Cooper, A. F., and Norris, R. J.: Thermal regime in the central Alpine Fault zone, New Zealand: Constraints from microstructures, biotite chemistry and fluid inclusion data, Tectonophysics, 485, 178–192, https://doi.org/10.1016/j.tecto.2009.12.013, 2010.
Toy, V. G., Boulton, C. J., Sutherland, R., Townend, J., Norris, R. J., Little, T. A., Prior, D. J., Mariani, E., Faulkner, D., Menzies, C. D., Scott, H., and Carpenter, B. M.: Fault rock lithologies and architecture of the central Alpine fault, New Zealand, revealed by DFDP-1 drilling, Lithosphere, 7, 155–173, https://doi.org/10.1130/l395.1, 2015.
Toy, V. G., Sutherland, R., Townend, J., Allen, M. J., Becroft, L., Boles, A., Boulton, C., Carpenter, B., Cooper, A., Cox, S. C., Daube, C., Faulkner, D. R., Halfpenny, A., Kato, N., Keys, S., Kirilova, M., Kometani, Y., Little, T., Mariani, E., Melosh, B., Menzies, C. D., Morales, L., Morgan, C., Mori, H., Niemeijer, A., Norris, R., Prior, D., Sauer, K., Schleicher, A. M., Shigematsu, N., Teagle, D. A. H., Tobin, H., Valdez, R., Williams, J., Yeo, S., Baratin, L. M., Barth, N., Benson, A., Boese, C., Célérier, B., Chamberlain, C. J., Conze, R., Coussens, J., Craw, L., Doan, M. L., Eccles, J., Grieve, J., Grochowski, J., Gulley, A., Howarth, J., Jacobs, K., Janku-Capova, L., Jeppson, T., Langridge, R., Mallyon, D., Marx, R., Massiot, C., Mathewson, L., Moore, J., Nishikawa, O., Pooley, B., Pyne, A., Savage, M. K., Schmitt, D., Taylor-Offord, S., Upton, P., Weaver, K. C., Wiersberg, T., and Zimmer, M.: Bedrock geology of DFDP-2B, central Alpine Fault, New Zealand, New Zeal. J. Geol. Geophys., 60, 497–518, https://doi.org/10.1080/00288306.2017.1375533, 2017.
Turnbull, I. M., Mortimer, N., and Craw, D.: Textural zones in the Haast Schist – a reappraisal, New Zeal. J. Geol. Geophys., 44, 171–183, https://doi.org/10.1080/00288306.2001.9514933, 2001.
Upton, P., Song, B. R., and Koons, P. O.: Topographic control on shallow fault structure and strain partitioning near Whataroa, New Zealand demonstrates weak Alpine Fault, New Zeal. J. Geol. Geophys., 61, 1–8, https://doi.org/10.1080/00288306.2017.1397706, 2017.
Vermilye, J. M. and Scholz, C. H.: The process zone: A microstructural view of fault growth, J. Geophys. Res. Earth, 103, 12223–12237, https://doi.org/10.1029/98JB00957, 1998.
Warr, L. N. and Cox, S.: Clay mineral transformations and weakening mechanisms along the Alpine Fault, New Zealand, in: Geological Society, London, Special Publications, vol. 186, edited by: Holdsworth, R. E., Strachan, R. A., Magloughlin, J. F., and Knipe, R. J., 85–101, The Geological Society, London, 2001.
Wellman, H.: Data for the Study of Recent and Late Pleistocene Faulting in the South, New Zeal. J. Sci. Technol., 34, 270–288, 1953.
Williams, J. N., Toy, V. G., Massiot, C., McNamara, D. D., and Wang, T.: Damaged beyond repair? Characterising the damage zone of a fault late in its interseismic cycle, the Alpine Fault, New Zealand, J. Struct. Geol., 90, 76–94, https://doi.org/10.1016/j.jsg.2016.07.006, 2016.
Williams, J. N., Toy, V. G., Smith, S. A. F., and Boulton, C.: Fracturing, fluid-rock interaction and mineralisation during the seismic cycle along the Alpine Fault, J. Struct. Geol., 103, 151–166, https://doi.org/10.1016/j.jsg.2017.09.011, 2017a.
Williams, J. N., Toy, V. G., Massiot, C., and McNamara, D.: X-ray Computed Tomography and borehole televiewer images of the Alpine Fault's hanging-wall, New Zealand: Deep Fault Drilling Project phase 1 (DFDP-1) and Amethyst Hydro Project (AHP), GFZ Data Serv., https://doi.org/10.5880/ICDP.5052.004, 2017b.
Wilson, J. E., Chester, J. S., and Chester, F. M.: Microfracture analysis of fault growth and wear processes, Punchbowl Fault, San Andreas system, California, J. Struct. Geol., 25, 1855–1873, https://doi.org/10.1016/S0191-8141(03)00036-1, 2003.
Wright, C. A.: Geology and paleoseismicity of the central Alpine Fault, New Zealand, 1998.
Yukutake, Y., Ito, H., Honda, R., Harada, M., Tanada, T., and Yoshida, A.: Fluid-induced swarm earthquake sequence revealed by precisely determined hypocenters and focal mechanisms in the 2009 activity at Hakone volcano, Japan, J. Geophys.-Res.-Sol. Ea., 116, B04308, https://doi.org/10.1029/2010JB008036, 2011.
Zangerl, C., Loew, S., and Eberhardt, E.: Structure, geometry and formation of brittle discontinuities in anisotropic crystalline rocks of the central Gotthard massif, Switzerland, Eclogae Geol. Helv., 99, 271–290, https://doi.org/10.1007/s00015-006-1190-0, 2006.
Short summary
We present new data on the orientation of fractures, their fill, and their density around the Alpine Fault, a plate boundary fault on the South Island of New Zealand. Fractures < 160 m of the fault are filled and show a range of orientations, whilst fractures at greater distances (< 500 m) are open and parallel to the rock's mechanical weakness. We interpret the latter fracture set to reflect near-surface processes, whilst the latter are potentially linked to deep-seated Alpine Fault seismicity.
We present new data on the orientation of fractures, their fill, and their density around the...