Articles | Volume 12, issue 10
https://doi.org/10.5194/se-12-2303-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-12-2303-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Oct 2021
Research article |
| 12 Oct 2021
Elastic anisotropies of deformed upper crustal rocks in the Alps
Ruth Keppler
CORRESPONDING AUTHOR
Institute for Geosciences, University of Bonn, Poppelsdorfer Schloss,
53115 Bonn, Germany
Roman Vasin
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear
Research, Joliot-Curie 6, 141980 Dubna, Russia
Michael Stipp
Institute for Geosciences and Geography, Von-Seckendorff-Platz 3,
06120 Halle (Saale), Germany
Tomás Lokajícek
Institute of Geology of the Czech Academy of Sciences, Rozvojova 269,
16000 Prague 6, Czech Republic
Matej Petruzálek
Institute of Geology of the Czech Academy of Sciences, Rozvojova 269,
16000 Prague 6, Czech Republic
Nikolaus Froitzheim
Institute for Geosciences, University of Bonn, Poppelsdorfer Schloss,
53115 Bonn, Germany
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Michael J. Schmidtke, Ruth Keppler, Jacek Kossak-Glowczewski, Nikolaus Froitzheim, and Michael Stipp
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Properties of deformed rocks are frequently anisotropic. One of these properties is the travel time of a seismic wave. In this study we measured the seismic anisotropy of different rocks, collected in the Alps. Our results show distinct differences between rocks of oceanic origin and those of continental origin.
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Properties of deformed rocks are frequently anisotropic. One of these properties is the travel time of a seismic wave. In this study we measured the seismic anisotropy of different rocks, collected in the Alps. Our results show distinct differences between rocks of oceanic origin and those of continental origin.
Related subject area
Subject area: Crustal structure and composition | Editorial team: Seismics, seismology, paleoseismology, geoelectrics, and electromagnetics | Discipline: Seismology
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Relocation of earthquakes in the southern and eastern Alps (Austria, Italy) recorded by the dense, temporary SWATH-D network using a Markov chain Monte Carlo inversion
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Heather Kennedy, Katrin Löer, and Amy Gilligan
Solid Earth, 13, 1843–1858, https://doi.org/10.5194/se-13-1843-2022, https://doi.org/10.5194/se-13-1843-2022, 2022
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The energy transition is an important topic for benefiting the future; thus renewable energy is required to reach net-zero carbon emission goals. Geothermal energy, heat from the ground, can be used in this transition. Therefore, geothermal fields need to be characterized as much as possible to allow for increased productivity within these fields. This study involves and looks at potential fractures within a geothermal field at depth to help increase the overall understanding of this field.
Laura Anna Ermert, Maria Koroni, and Naiara Korta Martiartu
EGUsphere, https://doi.org/10.5194/egusphere-2022-810, https://doi.org/10.5194/egusphere-2022-810, 2022
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We investigated gender and authorship in seismology by analyzing author names of peer-reviewed articles. Seismology continues to be a male-dominated field, although the representation of female authors has been increasing from 2010 to 2020. Gender gaps appear for single authors, authors in high-impact journals, and highly productive authors. We hope to draw the attention of the seismological community to these issues and motivate leaders in the field to take action in order to support diversity.
Jorge Acevedo, Gabriela Fernández-Viejo, Sergio Llana-Fúnez, Carlos López-Fernández, Javier Olona, and Diego Pérez-Millán
Solid Earth, 13, 659–679, https://doi.org/10.5194/se-13-659-2022, https://doi.org/10.5194/se-13-659-2022, 2022
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The NW Iberian Peninsula provides one of the most complete Variscan sections in Europe, showing the transition between a sedimentary domain with folds and thrust and a metamorphic domain with igneous intrusions. By processing the seismic ambient noise recorded by several seismograph networks in this area, new 3-D S-wave velocity and radial anisotropy models were created. These models reveal the limit between the two domains, delineating the core of the large western European Variscan Belt.
Nicola Piana Agostinetti, Alberto Villa, and Gilberto Saccorotti
Solid Earth, 13, 449–468, https://doi.org/10.5194/se-13-449-2022, https://doi.org/10.5194/se-13-449-2022, 2022
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Sensing the Earth is a fundamental operation for the future where georesources, like geothermal energy and CO2 underground storage, will become important tools for addressing societal challenges. The development of networks of optical fibre cables gives the possibility of a sensing grid with an unprecedented spatial coverage. Here, we investigate the potential of using portions of a optical fibre cable as a standard seismometer for exploring the subsurface and monitoring georesources.
Carolin M. Boese, Grzegorz Kwiatek, Thomas Fischer, Katrin Plenkers, Juliane Starke, Felix Blümle, Christoph Janssen, and Georg Dresen
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Hydraulic stimulation experiments in underground facilities allow for placing monitoring equipment close to and surrounding the stimulated rock under realistic and complex conditions at depth. We evaluate how accurately the direction-dependent velocity must be known for high-resolution seismic monitoring during stimulation. Induced transient deformation in rocks only 2.5–5 m apart may differ significantly in magnitude and style, and monitoring requires sensitive sensors adapted to the frequency.
Gregor Rajh, Josip Stipčević, Mladen Živčić, Marijan Herak, Andrej Gosar, and the AlpArray Working Group
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Guido Maria Adinolfi, Raffaella De Matteis, Rita de Nardis, and Aldo Zollo
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Laura Peruzza, Alessandra Schibuola, Maria Adelaide Romano, Marco Garbin, Mariangela Guidarelli, Denis Sandron, and Enrico Priolo
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Fabian Limberger, Michael Lindenfeld, Hagen Deckert, and Georg Rümpker
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Jiří Kvapil, Jaroslava Plomerová, Hana Kampfová Exnerová, Vladislav Babuška, György Hetényi, and AlpArray Working Group
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This paper presents a high-resolution 3-D shear wave velocity (vS) model of the Bohemian Massif crust imaged from high-density data and enhanced depth sensitivity of tomographic inversion. The dominant features of the model are relatively higher vS in the upper crust than in its surrounding, a distinct intra-crustal interface, and a velocity decrease in the lower part of the crust. The low vS in the lower part of the crust is explained by the anisotropic fabric of the lower crust.
Martijn P. A. van den Ende and Jean-Paul Ampuero
Solid Earth, 12, 915–934, https://doi.org/10.5194/se-12-915-2021, https://doi.org/10.5194/se-12-915-2021, 2021
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Mohammed Bello, David G. Cornwell, Nicholas Rawlinson, Anya M. Reading, and Othaniel K. Likkason
Solid Earth, 12, 463–481, https://doi.org/10.5194/se-12-463-2021, https://doi.org/10.5194/se-12-463-2021, 2021
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In this study, ground motion caused by distant earthquakes recorded in southeast Australia is used to image the structure of the crust and underlying mantle. This part of the Australian continent was assembled over the last 500 million years, but it remains poorly understood. By studying variations in crustal properties and thickness, we find evidence for the presence of an old microcontinent that is embedded in the younger terrane and forms a connection between Victoria and Tasmania.
Kasper van Wijk, Calum J. Chamberlain, Thomas Lecocq, and Koen Van Noten
Solid Earth, 12, 363–373, https://doi.org/10.5194/se-12-363-2021, https://doi.org/10.5194/se-12-363-2021, 2021
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The Auckland Volcanic Field is monitored by a seismic network. The lockdown measures to combat COVID-19 in New Zealand provided an opportunity to evaluate the performance of seismic stations in the network and to search for small(er) local earthquakes, potentially hidden in the noise during "normal" times. Cross-correlation of template events resulted in detection of 30 new events not detected by GeoNet, but there is no evidence of an increase in detections during the quiet period of lockdown.
Janneke van Ginkel, Elmer Ruigrok, and Rien Herber
Solid Earth, 11, 2015–2030, https://doi.org/10.5194/se-11-2015-2020, https://doi.org/10.5194/se-11-2015-2020, 2020
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Knowledge of subsurface velocities is key to understand how earthquake waves travel through the Earth. We present a method to construct velocity profiles for the upper sediment layer on top of the Groningen field, the Netherlands. Here, the soft-sediment layer causes resonance of seismic waves, and this resonance is used to compute velocities from. Recordings from large earthquakes and the background noise signals are used to derive reliable velocities for the deep sedimentary layer.
Ehsan Qorbani, Dimitri Zigone, Mark R. Handy, Götz Bokelmann, and AlpArray-EASI working group
Solid Earth, 11, 1947–1968, https://doi.org/10.5194/se-11-1947-2020, https://doi.org/10.5194/se-11-1947-2020, 2020
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The crustal structure of the Eastern and Southern Alps is complex. Although several seismological studies have targeted the crust, the velocity structure under this area is still not fully understood. Here we study the crustal velocity structure using seismic ambient noise tomography. Our high-resolution models image several velocity anomalies and contrasts and reveal details of the crustal structure. We discuss our new models of the crust with respect to the geologic and tectonic features.
Laura Ermert, Jonas Igel, Korbinian Sager, Eléonore Stutzmann, Tarje Nissen-Meyer, and Andreas Fichtner
Solid Earth, 11, 1597–1615, https://doi.org/10.5194/se-11-1597-2020, https://doi.org/10.5194/se-11-1597-2020, 2020
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We present an open-source tool to model ambient seismic auto- and cross-correlations with spatially varying source spectra. The modeling is based on pre-computed databases of seismic wave propagation, which can be obtained from public data providers. The aim of this tool is to facilitate the modeling of ambient noise correlations, which are an important seismologic observable, with realistic wave propagation physics. We present a description and benchmark along with example use cases.
Ben Moseley, Tarje Nissen-Meyer, and Andrew Markham
Solid Earth, 11, 1527–1549, https://doi.org/10.5194/se-11-1527-2020, https://doi.org/10.5194/se-11-1527-2020, 2020
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Simulations of seismic waves are very important; they allow us to understand how earthquakes spread and how the interior of the Earth is structured. However, whilst powerful, existing simulation methods usually require a large amount of computational power and time to run. In this research, we use modern machine learning techniques to accelerate these calculations inside complex models of the Earth.
Antonio Villaseñor, Robert B. Herrmann, Beatriz Gaite, and Arantza Ugalde
Solid Earth, 11, 63–74, https://doi.org/10.5194/se-11-63-2020, https://doi.org/10.5194/se-11-63-2020, 2020
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We present new earthquake focal depths and fault orientations for earthquakes that occurred in 2013 in the vicinity of an underground gas storage off the east coast of Spain. Our focal depths are in the range of 5–10 km, notably deeper than the depth of the gas injection (2 km). The obtained fault orientations also differ from the predominant faults at shallow depths. This suggests that the faults reactivated are deeper, previously unmapped faults occurring beneath the sedimentary layers.
Juvenal Andrés, Deyan Draganov, Martin Schimmel, Puy Ayarza, Imma Palomeras, Mario Ruiz, and Ramon Carbonell
Solid Earth, 10, 1937–1950, https://doi.org/10.5194/se-10-1937-2019, https://doi.org/10.5194/se-10-1937-2019, 2019
Marisol Monterrubio-Velasco, F. Ramón Zúñiga, José Carlos Carrasco-Jiménez, Víctor Márquez-Ramírez, and Josep de la Puente
Solid Earth, 10, 1519–1540, https://doi.org/10.5194/se-10-1519-2019, https://doi.org/10.5194/se-10-1519-2019, 2019
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Earthquake aftershocks display spatiotemporal correlations arising from their self-organized critical behavior. Stochastical models such as the fiber bundle (FBM) permit the use of an analog of the physical model that produces a statistical behavior with many similarities to real series. In this work, a new model based on FBM that includes geometrical faults systems is proposed. Our analysis focuses on aftershock statistics, and as a study case we modeled the Northridge sequence.
Chisheng Wang, Junzhuo Ke, Jincheng Jiang, Min Lu, Wenqun Xiu, Peng Liu, and Qingquan Li
Solid Earth, 10, 1397–1407, https://doi.org/10.5194/se-10-1397-2019, https://doi.org/10.5194/se-10-1397-2019, 2019
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The point cloud of located aftershocks contains the information which can directly reveal the fault geometry and temporal evolution of an earthquake sequence. However, there is a lack of studies using state-of-the-art visual analytics methods to explore the data to discover hidden information about the earthquake fault. We present a novel interactive approach to illustrate 3-D aftershock point clouds, which can help the seismologist to better understand the complex fault system.
Michael Behm, Feng Cheng, Anna Patterson, and Gerilyn S. Soreghan
Solid Earth, 10, 1337–1354, https://doi.org/10.5194/se-10-1337-2019, https://doi.org/10.5194/se-10-1337-2019, 2019
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New acquisition styles for active seismic source exploration provide a wealth of additional quasi-passive data. We show how these data can be used to gain complementary information about the subsurface. Specifically, we process an active-source dataset from an alpine valley in western Colorado with both active and passive inversion schemes. The results provide new insights on subsurface hydrology based on the ratio of P-wave and S-wave velocity structures.
Joeri Brackenhoff, Jan Thorbecke, and Kees Wapenaar
Solid Earth, 10, 1301–1319, https://doi.org/10.5194/se-10-1301-2019, https://doi.org/10.5194/se-10-1301-2019, 2019
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Earthquakes in the subsurface are hard to monitor due to their complicated signals. We aim to make the monitoring of the subsurface possible by redatuming the sources and the receivers from the surface of the Earth to the subsurface to monitor earthquakes originating from small faults in the subsurface. By using several sources together, we create complex earthquake signals for large-scale faults sources.
Peter Klin, Giovanna Laurenzano, Maria Adelaide Romano, Enrico Priolo, and Luca Martelli
Solid Earth, 10, 931–949, https://doi.org/10.5194/se-10-931-2019, https://doi.org/10.5194/se-10-931-2019, 2019
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Using geological and geophysical data, we set up a 3-D digital description of the underground structure in the central part of the Po alluvial plain. By means of computer-simulated propagation of seismic waves, we were able to identify the structural features that caused the unexpected elongation and amplification of the earthquake ground motion that was observed in the area during the 2012 seismic crisis. The study permits a deeper understanding of the seismic hazard in alluvial basins.
Andrew J. Calvert and Michael P. Doublier
Solid Earth, 10, 637–645, https://doi.org/10.5194/se-10-637-2019, https://doi.org/10.5194/se-10-637-2019, 2019
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Deep (> 40 km) seismic reflection surveys are acquired on land along crooked roads. Using the varying azimuth between source and receiver, the true 3-D orientation of crustal structures can be determined. Applying this method to a survey over the ancient Australian Yilgarn Craton reveals that most reflectors in the lower crust exhibit a systematic dip perpendicular to those in the overlying crust, consistent with lateral flow of a weak lower crust in the hotter early Earth 2.7 billion years ago.
Ruth A. Beckel and Christopher Juhlin
Solid Earth, 10, 581–598, https://doi.org/10.5194/se-10-581-2019, https://doi.org/10.5194/se-10-581-2019, 2019
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Scandinavia is crossed by extensive fault scarps that have likely been caused by huge earthquakes when the ice sheets of the last glacial melted. Due to the inaccessibility of the terrain, reflection seismic data have to be collected along crooked lines, which reduces the imaging quality unless special corrections are applied. We developed a new correction method that is very tolerant to noise and used it to improve the reflection image of such a fault and refine its geological interpretation.
Kees Wapenaar, Joeri Brackenhoff, and Jan Thorbecke
Solid Earth, 10, 517–536, https://doi.org/10.5194/se-10-517-2019, https://doi.org/10.5194/se-10-517-2019, 2019
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The earthquake seismology and seismic exploration communities have developed a variety of seismic imaging methods for passive- and active-source data. Despite the seemingly different approaches and underlying principles, many of these methods are based in some way or another on the same mathematical theorem. Starting with this theorem, we discuss a variety of classical and recent seismic imaging methods in a systematic way and explain their similarities and differences.
George Taylor, Sebastian Rost, Gregory A. Houseman, and Gregor Hillers
Solid Earth, 10, 363–378, https://doi.org/10.5194/se-10-363-2019, https://doi.org/10.5194/se-10-363-2019, 2019
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We constructed a seismic velocity model of the North Anatolian Fault in Turkey. We found that the fault is located within a region of reduced seismic velocity and skirts the edges of a geological unit that displays high seismic velocity, indicating that this unit could be stronger than the surrounding material. Furthermore, we found that seismic waves travel fastest in the NE–SW direction, which is the direction of maximum extension for this part of Turkey and indicates mineral alignment.
Haruo Sato
Solid Earth, 10, 275–292, https://doi.org/10.5194/se-10-275-2019, https://doi.org/10.5194/se-10-275-2019, 2019
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Recent seismological observations clarified that the velocity structure of the crust and upper mantle is randomly heterogeneous. I compile reported power spectral density functions of random velocity fluctuations based on various types of measurements. Their spectral envelope is approximated by the third power of wavenumber. It is interesting to study what kinds of geophysical processes created such a power-law spectral envelope at different scales and in different geological environments.
Peter Gaebler, Lars Ceranna, Nima Nooshiri, Andreas Barth, Simone Cesca, Michaela Frei, Ilona Grünberg, Gernot Hartmann, Karl Koch, Christoph Pilger, J. Ole Ross, and Torsten Dahm
Solid Earth, 10, 59–78, https://doi.org/10.5194/se-10-59-2019, https://doi.org/10.5194/se-10-59-2019, 2019
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On 3 September 2017 official channels of the Democratic People’s Republic of
Korea announced the successful test of a nuclear device. This study provides a
multi-technology analysis of the 2017 North Korean event and its aftermath using a wide array of geophysical methods (seismology, infrasound, remote sensing, radionuclide monitoring, and atmospheric transport modeling). Our results clearly indicate that the September 2017 North Korean event was in fact a nuclear test.
Claudia Werner and Erik H. Saenger
Solid Earth, 9, 1487–1505, https://doi.org/10.5194/se-9-1487-2018, https://doi.org/10.5194/se-9-1487-2018, 2018
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Time reverse imaging is a method for locating quasi-simultaneous or low-amplitude earthquakes. Numerous three-dimensional synthetic simulations were performed to discover the influence of station distributions, complex velocity models and high noise rates on the reliability of localisations. The guidelines obtained enable the estimation of the localisation success rates of an existing station set-up and provide the basis for designing new arrays.
Cited articles
Ábalos, B., Fountain, D. M., Gil Ibarguchi, J. I., and Puelles, P.:
Eclogite as a seismic marker in subduction channels: Seismic
velocities,anisotropy, and petrofabric of Cabo Ortegal eclogite tectonite
(Spain), Geol. Soc. Am. Bull., 123, 439–456, 2011.
Abrecht, J.: Geologic units of the Aar massif and their pre-Alpine rock
associations: a critical review, Schweiz, Mineral. Petrogr. Mitt., 74, 5–27,
1994.
Aleksandrov, K. S., Alchikov, U. V., Belikov, B. P., Zaslavski, B. I., and
Krupny, A. I.: Elastic wave velocities in minerals at atmospheric pressure
and increasing precision of elastic constants by means of EVM, Izvestija
Academy of Science USSR, Geol. Ser., 10, 15–24, 1974.
Aleksandrov, K. S. and Ryzhova, T. V.: The elastic properties of rock forming
minerals, Izvestija Academy of Science USSR, Geophys. Ser., 12, 1799–1804,
1961.
Almqvist, B. S. G., Hirt, A. M., Herwegh, M., Ebert, A., Walter, J. M.,
Leiss, B., and Burlini, L.: Seismic anisotropy in the Morcles nappe shear zone:
Implications for seismic imaging of crustal scale shear zones,
Tectonophysics, 603, 162–178, 2013.
Almqvist, B. S. G. and Mainprice, D.: Seismic properties and anisotropy of
the continental crust: Predictions based on mineral texture and rock
microstructure, Rev. Geophys., 55, 367–433, 2017.
Angiboust, S., Agard, P., Jolivet, L., and Beyssac, O.: The Zermatt-Saas
ophiolite: the largest (60-km wide) and deepest (c. 70–80 km) continuous
slice of oceanic lithosphere detached from a subduction zone?, Terra Nova, 21,
171–180, 2009.
Avseth, P., Mukerji, T., Mavko, G., and Dvorkin, J.: Rock-physics
diagnostics of depositional texture, diagenetic alterations, and reservoir
heterogeneity in high-porosity siliciclastic sediments and rocks – A
review of selected models and suggested work flows, Geophysics, 75,
31–47, 2010.
Babuška, V.: Elastic anisotropy of igneous and metamorphic rocks,
Studia Geophysica et Geodaetica, 12, 291–303, https://doi.org/10.1007/BF02592385, 1968.
Backus, G. E.: Long-wave elastic anisotropy produced by horizontal layering,
J. Geophys. Res., 67, 11, 4427–4440, 1962.
Barruol, G., Bonnin, M., Pedersen, H., Bokelmann, G. H. R., and Tiberi, C.:
Belt-parallel mantle flow beneath a halted continental collision: The
Western Alps, Earth Planet. Sc. Lett., 302, 429–438, 2011.
Barruol, G., Deschamps, A., and Coutant, O.: Mapping upper mantle anisotropy
beneath SE France by SKS splitting indicates Neogene asthenospheric flow
induced by Apenninic slab roll-back and deflected by the deep Alpine roots,
Tectonophysics, 394, 125–138, 2004.
Barruol, G. and Kern, H.: Seismic anisotropy and shear-wave splitting in
lower-crustal and upper-mantle rocks from the Ivrea Zone – Experimental and
calculated data, Phys. Earth Planet. Int., 95, 175–194, 1996.
Bascou, J., Barruol, G., Vauchez, A., Mainprice, D., and Egydio-Silva, M.:
EBSD-measured lattice-preferred orientations and seismic properties of
eclogites, Tectonophysics, 342, 61–80, 2001.
Bayuk, I. O., Ammerman, M., and Chesnokov, E. M.: Upscaling of elastic
properties of anisotropic sedimentary rocks, Geophys. J. Int., 172, 842–860,
2008.
Ben Ismail, W. and Mainprice, D. : An olivine fabric database: an overview of
upper mantle fabrics and seismic anisotropy, Tectonophysics, 296, 145–157,
1998.
Berryman, J. G.: Long-wavelength propagation in composite elastic media I.
Spherical inclusions, J. Acoust. Soc. Am., 68,
1809–1819, 1980.
Bezacier, L., Reynard, B., Bass, J. D., Wang, J., and Mainprice, D.:
Elasticity of glaucophane, seismic velocities and anisotropy of the
subducted oceanic crust, Tectonophysics, 494, 201–210, 2010.
Bhagat, S. S., Bass, J. D., and Smyth, J. R.: Single-crystal elastic properties
of omphacite-C2/C by Brillouin spectroscopy, J. Geophys. Res.-Sol. Ea.
97, 6843–6848, 1992.
Bokelmann, G. H. R., Qorbani, E., and Bianchi, I.: Seismic anisotropy and
large-scale deformation of the Eastern Alps, Earth Planet. Sc. Lett., 383, 1–6, 2013.
Brantley, S. L., Brantley, B., Evans, S. H., and Hickman, D. A.: Crerar: Healing of
microcracks in quartz: Implications for fluid flow, Geology, 18, 136–139,
1990.
Brown, J. M., Abramson, E. H., and Angel, R. J.: Triclinic elastic constants for
low albite, Phys. Chem. Miner., 33, 256–265, 2006.
Burlini, L. and Kunze, K.: Fabric and Seismic Properties of Carrara Marble
Mylonite, Phys. Chem. Earth, 25, 133–139, 2000.
Challandes, N., Marquer, D., and Villa, I. M.: P-T-t modelling, fluid
circulation, and 39Ar-40Ar and Rb-Sr mica ages in the Aar Massif shear zones
(Swiss Alps), Swiss J. Geisci., 101, 269–288, 2008.
Christensen, N. I.: Compressional wave velocities in metamorphic rocks at
pressures to 10 kbar, J. Geophys. Res., 70, 6147–6164, 1965.
Christensen, N. I.: Compressional wave velocities in rocks at high
temperatures and pressures, critical thermal gradients, and crustal
low-velocity zones, J. Geophys. Res.-Sol. Ea., 84,
6849–6857, 1979.
Christensen, N. I.: Compressional wave velocities in possible mantle rocks to
pressures of 30 kilobars, J. Geophys. Res., 79, 407–412, 1974.
Cholach, P. Y. and Schmitt, D. R.: Intrinsic elasticity of a textured
transversely isotropic muscovite aggregate: Comparisons to the seismic
anisotropy of schists and shales. J. Geophys. Res., 111,
B09410, https://doi.org/10.1029/2005JB004158, 2006.
Christensen, N. I. and Mooney, W. D.: Seismic velocity structure and
composition of the continental crust: a global view, J. Geophys. Res.,
100, 9761–9788, 1995.
Christoffel, E. B.: Über die Fortpflanzung von Stössen durch
elastische, feste Körper, Annali di Matematica, 8, 193–243, 1877.
Dale, J. and Holland, T. B. J.: Geothermobarometry, P–T paths and metamorphic
field gradients of high-pressure rocks from the Adula Nappe, Central Alps,
J. Metamor. Geol., 21, 813–829, 2003.
Dandekar, D. P.: Variation in the elastic constants of calcite with pressure,
Am. Geophys. Union Trans. 49, 323 pp., 1968.
Derez, T., Pennock, G., Drury, M., and Sintubin, M.: Low-temperature
intracrystalline deformation microstructures in quartz, J. Struct. Geol., 71, 3–23, 2015.
Engi, M., Todd, S. C. and Schmatz, D. R.: Tertiary metamorphic conditions in
the eastern Lepontine Alps,
Schweizerische Mineralogische und Petrographische Mitteilungen, 75,
347–396, 1995.
Erdman, M. E., Hacker, B. R., Zandt, G., and Seward, G.: Seismic anisotropy
of the crust: Electron-backscatter diffraction measurements from the Basin
and Range, Geophys. J. Int., 195, 1211–1229, https://doi.org/10.1093/gji/ggt287, 2013.
Faccenda, M., Ferreira, A. M. G., Tisato, N., Lithgow-Bertelloni, C.,
Stixrude, L., and Pennacchioni, G.: Extrinsic Elastic Anisotropy in a
Compositionally Heterogeneous Earth's Mantle, J. Geophys. Res.-Sol. Ea., 124, 1671–1687, 2019.
Froitzheim, N. and Manatschal, G.: Kinematics of Jurassic rifting, mantle
exhumation, and passive-margin formation in the Austroalpine and Penninic
nappes (eastern Switzerland), Geol. Soc. Am. Bull., 108, 1120–1133, 1996.
Fry, B., Deschamps, F., Kissling, E., Stehly, L., and Giardini, D.: Layered
azimuthal anisotropy of Rayleigh wave phase velocities in the European
Alpine lithosphere inferred from ambient noise, Earth Planet. Sc. Lett.,
297, 95–102, 2010.
Goncalves, P., Oliot, E., Marquer, D., and Connolly, J.: Role of chemical
processes on shear zone formation: an example from the Grimsel
metagranodiorite (Aar massif, Central Alps), J. Metamor. Geol.,
30, 703–722, https://doi.org/10.1111/j.1525-1314.2012.00991.x, 2012.
Hadley, K.: Comparison of calculated and observed crack densities and
seismic velocities in Westerly granite, J. Geophys. Res., 81, 3484–3494,
1976.
Hartmann G. and Wedepohl K. H.: The composition of peridotite tectonites from
the Ivrea Complex, northern Italy: Residues from melt extraction, Geochim.
Cosmochim. Ac., 57, 1761–1782, 1993.
Heinrich, C. A.: Eclogite facies regional metamorphism of hydrous mafic
rocks in the Central
Alpine Adula nappe, J. Petrol., 27, 123–154, 1986.
Heteìnyi G., Molinari, I., Clinton, J., Bokelmann, G., Bondár, I.,
Crawford, W. C., Dessa, J.-X., Doubre, C., Friederich, W., Fuchs, F., Giardini, D., Gráczer, Z., Handy, M. R., Herak, M., Jia, Y., Kissling, E., Kopp, H., Korn, M., Margheriti, L., Meier, T., Mucciarelli, M., Paul, A., Pesaresi, D., Piromallo, C., Plenefisch, T., Plomerová, J., Ritter, J., Rümpker, G., Sipka, V., Spallarossa, D., Thomas, C., Tilmann, F., Wassermann, J., Weber, M., Wéber, Z., Westergom, V., Zivic, M., AlpArray Seismic Network Team, AlpArray OBS Cruise Crew, and AlpArray Working Group:
The AlpArray Seismic Network: a large-scale European experiment to image the
Alpine orogeny, Surv. Geophys., 39, 1009–1033, 2018.
Hetényi, G., Plomerová, J., Bianchi, I., Kampfová Exnerová, H.,
Bokelmann, G., Handy, M. R., and Babuška, V.: From mountain summits to
roots: crustal structure of the Eastern Alps and Bohemian Massif along
longitude 13.3∘ E, Tectonophysics, 744, 239–255, 2018.
Heyliger, P., Ledbetter, H., and Kim, S.: Elastic constants of natural quartz,
J. Acoust. Soc. Am., 114, 644–650, 2003.
Huang, J., Devoe, M., Gomez-Barreiro, J., Ren, Y., Vasin, R., and Wenk, H.-R.:
Preferred orientation and anisotropy of Slates from Northern Spain,
Int. J. Earth Sci., submitted, 2021.
Humbert, P. and Plique, F.: Propriétés élastiques de carbonates
rhombohédriques monocristallins calcite, magnésite, dolomite, C. R.
Acad. Sci. Paris, 275, 391–394, 1972.
Ivankina, T. I., Kern, H., and Nikitin, A. N.: Directional dependence of P-
and S-wave propagation and polarization in foliated rocks from the Kola
superdeep well: evidence from laboratory measurements and calculations based
on TOF neutron diffraction, Tectonophysics, 407, 25–42, 2005.
Ivankina, T. I., Zel, I. Y., Lokajicek, T., Kern, H., Lobanov, K. V., and
Zharikov, A. V.: Elastic anisotropy of layered rocks: ultrasonic measurements
of plagioclase-biotite-muscovite (sillimanite) gneiss versus texture-based
theoretical predictions (effective media modeling), Tectonophysics, 712–713, 82–94,
https://doi.org/10.1016/j.tecto.2017.05.005, 2017.
Ji, S. and Salisbury, M. H.: Shear-wave velocities, anisotropy and splitting
in high-grade mylonites, Tectonophysics, 221, 453–473, 1993.
Ji, S., Salisbury, M. H., and Hanmer, S.: Petrofabric, P-wave anisotropy and
seismic reflectivity of highgrade mylonites, Tectonophysics, 222, 195–226,
1993.
Ji, S., Wang, Q., and Xia, B.: P-wave velocities of polymineralic rocks:
comparison of theory and experiment and test of elastic mixture rules,
Tectonophysics, 366, 165–185, 2003.
Kachanov, M. and Mishakin, V. V.: On crack density, crack porosity, and the
possibility to interrelate them, Int. J. Eng. Sci., 142, 185–189, 2019.
Karato, S., Jung, H., Katayama, I., and Skemer, P.: Geodynamic Significance
of Seismic Anisotropy of the
Upper Mantle: New Insights from Laboratory Studies, Annu. Rev. Earth
Planet. Sci., 36, 59–95, 2008.
Kelly, C. M., Faulkner, D. R., and Rietbrock, A.: Seismically invisible fault
zones: Laboratory insights into imaging faults in anisotropic rocks, Geophys. Res. Lett., 44, 8205–8212,
2017.
Keppler, R.: raw SKAT data, figshare [data set], https://doi.org/10.6084/m9.figshare.16782766.v1, 2021.
Keppler, R., Behrmann, J. H., and Stipp, M.: Textures of eclogites and
blueschists from Syros island, Greece: inferences for elastic anisotropy of
subducted oceanic crust, J. Geophys. Res.-Sol. Ea., 122, 5306–5324, https://doi.org/10.1002/2017JB014181,
2017.
Keppler, R., Stipp, M., Behrmann, J. H., Ullemeyer, K., and Heidelbach, F.:
Deformation inside a paleosubduction channel – insights from microstructures
and crystallographic preferred orientations of eclogites and metasediments
from the Tauern Window, Austria, J. Struct. Geol., 82, 60–79, 2016.
Keppler, R., Ullemeyer, K., Behrmann, J. H., and Stipp, M.: Potential of full
pattern fit methods for the texture analysis of geological materials:
Implications from texture measurements at the recently upgraded neutron
time-of-flight diffractometer SKAT, J. Appl. Crystallogr., 47, 1520–1535,
2014.
Keppler, R., Ullemeyer, K., Behrmann, J. H., Stipp, M., Kurzawski, R., and Lokajíček, T.: Crystallographic preferred orientations of exhumed
subduction channel rocks from the Eclogite zone of the Tauern Window
(eastern Alps, Austia), and implications on rock elastic anisotropies at
great depths, Tectonophysics, 647, 89–104, 2015.
Kern, H., Ivankina, T. I., Nikitin, A. N., Lokajicek, T., and Pros, Z.: The
effect of oriented microcracks and crystallographic and shape preferred
orientation on bulk elastic anisotropy of a foliated biotite gneiss from
Outokumpu, Tectonophysics, 457, 143–149, 2008.
Kern, H. and Wenk, H.-R.: Fabric-related velocity anisotropy and
shear wave splitting in rocks from the Santa Rosa mylonite zone, California,
J. Geophys. Res., 95, 11213–11223. https://doi.org/10.1029/JB095iB07p11213, 1990.
Kitamura, K.: Constraint of lattice-preferred orientation (LPO) on Vp
anisotropy of amphibole-rich rocks, Geophys. J. Int., 165, 1058–1065,
2006.
Kossak-Glowczewski, J., Froitzheim, N., Nagel, T. J., Pleuger, J., Keppler,
R., Leiss, B., and Regent, V.: Along-strike shear-sense reversal in the
Vals-Scaradra Shear Zone at the front of the Adula Nappe (Central Alps,
Switzerland), Swiss J. Geosci., 110, 677–697, 2017.
Kurz, W., Fritz, H., Tenczer, V., and Unzog, W.: Tectonometamorphic evolution
of the Koralm Complex (Eastern Alps): constraints from microstructures and
textures of the “Plattengneis” shear zone, J. Struct. Geol., 24,
1957–1970, 2002.
Laubscher, H. P.: Large-scale, thin-skinned thrusting in the southern Alps:
Kinematic models, GSA Bull., 96, 710–718, 1985.
Lespinasse, M. and Pêcher, A.: Microfracturing and regional stress field:
a study of the preferred orientations of fluid inclusion planes in a granite
from the Massif Central, France, J. Struct. Geol., 8, 169–180, 1986.
Link, F. and Rümpker, G.: Resolving seismic anisotropy in the
lithosphere-asthenosphere in the Central/Eastern Alps beneath the dense
SWATH-D network, Front. Earth Sci., 9, 652–667,
https://doi.org/10.3389/feart.2021.679887, 2021.
Llana-Fúnez, S. and Brown, D.: Contribution of crystallographic
preferred orientation to seismic anisotropy across a surface analog of the
continental Moho at Cabo Ortegal, Spain, GSA Bull., 124, 1495–1513,
2012.
Llana-Fúnez, S., Brown, D., Carbonell, R., Álvarez-Marrón, J.,
and Salisbury, M.: Seismic anisotropy of upper mantle-lower continental
crust rocks in Cabo Ortegal (NW Spain) from crystallographic preferred
orientation (CPO) patterns, Trabajos de Geología, Universidad de
Oviedo, 29, 432–436, 2009.
Lokajicek, T., Kern, H., Svitek, T., and Ivankina, T.: 3D velocity
distribution of P- and S-waves in a biotite gneiss, measured in oil as the
pressure medium: Comparison with velocity measurements in a multi-anvil
pressure apparatus and with texture-based calculated data, Phys. Earth
Planet. Int., 231, 1–15, 2014.
Lokajíček, T., Vasin, R., Svitek, T., Petružálek, M.,
Kotrlý, M., Turková, I., Onysko, R., and Wenk, H. R.: Intrinsic elastic
anisotropy of Westerly granite observed by ultrasound measurements,
microstructural investigations, and neutron diffraction, J. Geophys. Res.-Sol. Ea., 126, e2020JB020878, https://doi.org/10.1029/2020JB020878, 2021.
Löw, S: Die tektono-metamorphe Entwicklung der Nördlichen
Adula-Decke. Beiträge zur Geologischen Karte der Schweiz N.F., 161,
1–84, 1987.
Lüschen, E., Lammerer, B., Gebrande, H., Millahn, K., and TRANSALP Working
Group: Orogenic structure of the Eastern Alps, Europe, from TRANSALP deep
seismic reflection profiling, Tectonophys, 388, 85–102, 2004.
Lutterotti, L., Matthies, S., Wenk, H.-R., Schultz, A. J., and Richardson,
J. W.: Combined texture and structure analysis of deformed limestone from
time-of-flight neutron diffraction spectra, J. Appl. Phys., 81, 594–600,
1997.
Mainprice, D., Barruol, G., and Ben Ismaïl, W.: The seismic anisotropy
of the Earth's mantle: from single crystal to polycrystal, in: Earth's deep interior: mineral physics and seismic tomography: from atomic
to global: AGU Geophysics Monograph, edited by: Karato,
S.-I., Forte, A. M., Liebermann, R. C., Masters, G., and Stixrude, L., American Geophysical Union, 117, 237–264, 2000.
Mainprice, D. and Humbert, M.: Methods of calculating petrophysical
properties from lattice preferred orientation data, Surv. Geophys., 15,
575–592, 1994.
Matthies, S.: On the combination of self-consistent and geometric mean
elements for the calculation of the elastic properties of textured
multi-phase samples, Solid State Phenom., 160, 87–93, 2010.
Matthies, S.: GEO-MIX-SELF calculations of the elastic properties of a
textured graphite sample at different hydrostatic pressures, J. Appl.
Crystallogr., 45, 1–16, 2012.
Matthies, S. and Humbert, M.: On the principle of a geometric mean of
even-rank symmetric tensors for textured polycrystals, J. Appl. Crystallogr.
28, 254–266, 1995.
Matthies, S. and Wenk, H.-R.: Transformations for monoclinic crystal
symmetry in texture analysis, J. Appl. Cryst., 42, 564–571, 2009.
Matthies, S., Lutteroti, L., and Wenk, H. R.: Advances in Texture Analysis
from Diffraction Spectra, J. Appl. Cryst. 30, 31–42, 1997.
Mauler, A., Burlini, L., Kunze, K., Philippot, P., and Burg, J.-P.: P-wave
anisotropy in eclogites and relationship to the omphacite crystallographic
fabric, Phys. Chem. Earth, 15, 119–126, 2000.
Menegon, L., Pennacchioni, G., Heilbronner, R., and Pittarello, L.: Evolution of
quartz microstructure and c-axis crystallographic preferred orientation
within ductilely deformed granitoids (Arolla unit, Western Alps), J. Struct. Geol., 30, 1332–1347, 2008.
Meyre, C. and Pusching, A. R.: High-pressure metamorphism and deformation
at Trescolmen,
Adula nappe, Central Alps, Schweizerische Mineralogische und Petrographische
Mitteilungen, 73, 277–283, 1993.
Meyre, C., De Capitani, C., and Partsch, J. H.: A ternary solid solution
model for omphacite and its application to geothermobarometry of eclogites
from the Middle Adula nappe (Central Alps, Switzerland), J. Metamor. Geol., 15, 687–700, 1997.
Millahn, K., Lüschen, E., Gebrande, H., and TRANSALP Working Group:
TRANSALP-cross-line recording during the seismic reflection transect in the
Eastern Alps, Tectonophys., 414, 39–49, 2005.
Molinari, I., Obermann, A., Kissling, E., Hetényi, G., Boschi, L., and
AlpArray-EASI working group: 3D crustal structure of the Eastern Alpine
region from ambient noise tomography, Results in Geophysical Sciences, 1–4,
https://doi.org/10.1016/j.ringps.2020.100006, 2020.
Montagner, J.-P. and Guillot, L.: Seismic Anisotropy and global
geodynamics, Mineral. Soc. Am., 51, 353–385, 2003.
Morris, P. R.: Elastic constants of polycrystals, Int. J. Eng. Sci., 8, 49–61,
1970.
Nagel, T. J.: Subduction, collision and exhumation recorded in the Adula
nappe, central Alps, in: Tectonic Aspects of the Alpine–Dinarides–Carpathian System:
Geological Society, edited by: Siegesmund, S., Fügenschuh, B., and Froitzheim, N., London, Special Publications, 298, 365–392, 2008.
Nagel, T., De Capitani, C., and Frey, M.: Isograds and P-T evolution in the
eastern Lepontine Alps (Graubunden, Switzerland), J. Metamor. Geol., 20, 309–324, 2002.
Neufeld, K., Ring, U., Heidelbach, F., Dietrich, S., and Neuser, R. D.:
Omphacite textures in eclogites of the Tauern Window: Implications for the
exhumation of the Eclogite Zone, Eastern Alps, J. Struct. Geol., 30, 976–992, 2008.
Nishizawa, O. and Yoshino, T.: Seismic velocity anisotropy in mica-rich
rocks: an inclusion model, Geophys. J. Int., 145, 19–32,
2001.
Okaya, D., Vel, S. S., Song, W. J., and Johnson, S. E.: Modification of
crustal seismic anisotropy by geological structures (“structural geometric
anisotropy”), Geosphere, 15, 146–170, 2019.
Oliot, E., Goncalves, P., and Marquer, D.: Role of plagioclase and reaction
softening in a metagranite shear zone at mid-crustal conditions (Gotthard
Massif, Swiss Central Alps), J. Metamor. Geol., 28, 849–871, 2010.
Park, M. and Jung, H.: Analysis of electron backscattered diffraction (EBSD)
mapping of geological materials: precautions for reliably collecting and
interpreting data on petro-fabric and seismic anisotropy, Geosci. J., 24, 679–687, https://doi.org/10.1007/s12303-020-0002-2, 2020.
Petrescu, L., Pondrelli, S., Salimbeni, S., Faccenda, M., and the AlpArray Working Group: Mantle flow below the central and greater Alpine region: insights from SKS anisotropy analysis at AlpArray and permanent stations, Solid Earth, 11, 1275–1290, https://doi.org/10.5194/se-11-1275-2020, 2020.
Pfiffner, O. A., Frei, W., Finckh, P., and Valasek, P.: Deep seismic
reflection profiling in the Swiss Alps: Explosion seismology results for
line NFP 20-EAST, Geology, 16, 987–990, 1988.
Pleuger, J., Hundenborn, R., Kremer, K., Babinka, S., Kurz, W., Jansen, E., and
Froitzheim, N.: Structural evolution of Adula nappe, Misox zone, and Tambo
nappe in the San Bernardino area: Constraints for the exhumation of the
Adula eclogites. Mitteilungen der Österreichischen Geologischen
Gesellschaft, 94, 99–122, 2003.
Pros, Z., Lokajíček, T., Přikryl, R., and Klima, K.: Direct
measurement of 3D elastic anisotropy on rocks from the Ivrea Zone (Southern
Alps, NW Italy), Tectonophysics, 370, 31–47, 2003.
Puelles, P., Ábalos, B., Gil Ibarguchi, J. I., and Rodríguez, J.: Scales
of deformation partitioning during exhumation in a continental subduction
channel: A petrofabric study of eclogites and gneisses from NW Spain,
J. Metamor. Geol., 36, 225–254, 2018.
Punturo, R., Kern, H., Cirrincione, R., Mazzoleni, P., and Pezzino, A.: P-
and S-wave velocities and densities in silicate and calcite rocks from the
Peloritani mountains, Sicily (Italy): the effect of pressure, temperature
and the direction of wave propagation, Tectonophysics, 409, 55–72, 2005.
Qorbani, E., Bianchi, I., and Bokelmann, G.: Slab detachment under the
Eastern Alps seen by seismic anisotropy, Earth Planet. Sc. Lett., 409, 96–108, 2015.
Reuss, A.: Berechnung der Fließgrenze von Mischkristallen auf Grund der
Plastizitätsbedingung für Einkristalle, Z Angewandte Mathematik
Mechanik, 9, 49–58, 1929.
Sandmann, S., Nagel, T. J., Herwartz, D., Fonseca, R. O. C., Kurzawski, R.
M., and Münker, C.: Lu–Hf garnet
systematics of a polymetamorphic basement unit: new evidence for coherent
exhumation of the Adula Nappe (Central Alps) from eclogite-facies
conditions, Contrib. Mineral. Petrol., 168, 1–21, 2014.
Sayers, C.: Long-wave seismic anisotropy of heterogeneous reservoirs,
Geophys. J. Int., 132, 667–673, 1998.
Schaltegger, U.: Unravelling the pre-Mesozoic history of Aar and Gotthard
massifs (Central Alps) by isotopc dating – a review, Schweiz, Mineral.
Petrogr. Mitt., 74, 41–51, 1994.
Schmid, S. M., Fügenschuh, B., Kissling, E., and Schuster, R.: Tectonic
map and overall architecture of the Alpine orogeny, Eclogae Geologicae
Helvetiae, 97, 93–117, 2004.
Schmid, S. M. and Kissling, E.: The arc of the western Alps in the light of
geophysical data on deep crustal structure, Tectonics, 19, 62–85, 2000.
Schmidtke, M. J., Keppler, R., Kossak-Glowczewski, J., Froitzheim, N., and Stipp, M.: Elastic anisotropies of rocks in a subduction and exhumation setting, Solid Earth, 12, 1801–1828, https://doi.org/10.5194/se-12-1801-2021, 2021.
Silver, P. G.: Seismic anisotropy beneath the continents: probing the depths
of geology, Annu. Rev. Earth Space Sci., 24, 385, https://doi.org/10.1146/annurev.earth.24.1.385, 1996.
Simancas, J. F., Tahiri, A., Azor, A., González Lodeiro, F.
Martínez Poyatos, D., and El Hadi, H.: The tectonic frame of the
Variscan-Alleghanian Orogen in Southern Europe and Northern Africa,
Tectonophysics, 398, 181–198, 2005.
Smith, G. P. and Ekström, G.: A global study of Pn anisotropy beneath
continents, J. Geophys. Res., 104, 963–980, 1999.
Steck, A.: Une carte des zones de cisaillement ductile desAlpes Central,
Eclogae Geologicae Helvetiae, 83, 3, 603–627, 1990.
Stipp, M. and Kunze, K.: Dynamic recrystallization near the brittle-plastic
transition in naturally and experimentally deformed quartz aggregates,
Tectonophysics, 448, 77–97, https://doi.org/10.1016/j.tecto.2007.11.041, 2008.
Stünitz, H., Thust, A., Heilbronner, R., Behrens, H., Kilian, R.,
Tarantola, A., and Fitz Gerald, J. D.: Water redistribution in experimentally
deformed natural milky quartz single crystals – Implications for H2O
weakening processes, J. Geophys. Res.-Sol. Ea., 122,
866–894, 2017.
Ullemeyer, K., Leiss, B., and Stipp, M.: Textures and Microstructures in
Peridotites from the Finero Complex (Ivrea Zone, Alps) and its Influence on
the Elastic Rock Properties, Solid State Phenomena, 160, 183–188, 2010.
Ullemeyer, K., Lokajíček, T., Vasin, R. N., Keppler, R., and
Behrmann, J. H.: Extrapolation of bulk rock elastic moduli of different rock
types to high pressure conditions and comparison with texture-derived
elastic moduli, Phys. Earth Planet. Int., 275, 32–43, 2018.
Ullemeyer, K., Siegesmund, S., Rasolofosaon, P. N. J., and Behrmann, J. H.:
Experimental and texture-derived P-wave anisotropy of principal rocks from
the TRANSALP traverse: an aid for the interpretation of seismic field data,
Tectonophysics, 414, 97–116, 2006.
Ullemeyer, K., Spalthoff, P., Heinitz, J., Isakov, N. N., Nikitin, A. N.,
and Weber, K.: The SKAT texture diffractometer at the pulsed reactor IBR-2
at Dubna: Experimental layout and first measurements, Nuclear Instruments
and Methods of Physical Research, 412, 80–88, 1998.
Vasin, R., Wenk, H.-R., Kanitpanyacharoen, W., Matthies, S., and Wirth, R.:
Anisotropy of Kimmeridge shale, J. Geophys. Res.-Sol. Ea., 118,
3931–3956, 2013.
Vasin, R. N., Lebensohn, R. A., Matthies, S., Tome, C. N., and Wenk, H.-R.: The
influence of grain shape and volume fraction of sheet silicates on elastic
properties of aggregates: biotite platelets in an isotropic matrix,
Geophysics, 79, 433–441, 2014.
Vasin, R.N., Kern, H., Lokajíek, T., Svitek, T., Lehmann, E., Mannes,
D.C., Chaouche, M., and Wenk, H.-R.: Elastic anisotropy of Tambo gneiss from
Promontogno, Switzerland: a comparison of crystal orientation and
microstructure-based modelling and experimental measurements, Geophys. J.
Int., 209, 1–20, 2017.
Vaughan, M. T. and Guggenheim, S.: Elasticity of muscovite and its
relationship to crystal structure, J. Geophys. Res., 91, 4657–4664, 1986.
Vernik, L.: Seismic petrophysics in quantitative interpretation, chap. 3, 43–86, Society of
Exploration Geophysicists, https://doi.org/10.1190/1.9781560803256, 2016.
Vilhelm, J., Rudajev, V., Zivor, R., Lokajícek, T., and Pros, Z.:
Influence of crack distribution of rocks on P-wave velocity anisotropy – a
laboratory and field scale study, Geophys. Prospect., 58, 1099–1110,
2010.
Voigt, W.: Theoretische Studien über die Elasticitätsverhältnisse
der Krystalle, Dieterichsche Verlags-Buchhandlung, Göttingen, 100 pp., 1887.
Vollbrecht, A., Rust, S., and Weber, K.: Development of microcracks in granites
during cooling and uplift: examples from the Variscan basement in NE-Bavaria
(FRG), J. Struct. Geol., 13, 787–799, 1991.
Vollbrecht, A., Dürrast, H., Kraus, J., and Weber, K.: Paleostress directions
deduced from microcrack fabrics in KTB core samples and granites from the
surrounding area, Sci. Drill., 4, 233–241, 1994.
Vollbrecht, A., Stipp, M., and Olesen, N. Ø.: Crystallographic orientation
of microcracks in quartz and inferred deformation processes: a study on
gneisses from the German Continental Deep Drilling Project (KTB),
Tectonophysics, 303, 279–297, 1999.
Von Dreele, R. B.: Quantitative texture analysis by rietveld refinement, J.
Appl. Cryst., 30, 517–525, 1997.
Walsh, J. B.: The effect of cracks on the compressibility of rock, J. Geophys. Res., 70, 381–389, 1965.
Wehrens, P., Baumberger, R., Berger, A., and Herwegh, M.: How is strain
localized in a meta-granitoid, mid-crustal basement section?, Spatial
distribution of deformation in the central Aar massif (Switzerland), J. Struct. Geol., 94, 47–67, https://doi.org/10.1016/j.jsg.2016.11.004, 2016.
Weiss, T., Siegesmund, S., Rabbel, W., Bohlen, T., and Pohl, M.: Seismic
Velocities and Anisotropy of the Lower Continental Crust: A Review, Pure
Appl. Geophys., 156, 97–122, 1999.
Wenk, H.-R., Lutterotti, L., and Vogel, S. C.: Rietveld texture analysis from
TOF neutron diffraction data, Powder Diffraction, 25, 283–296, 2010.
Wenk, H.-R., Matthies, S., Donovan, J., and Chateignier, D.: BEARTEX, a
Windows-based program system for quantitative texture analysis, J. Appl.
Cryst., 31, 262–269, 1998.
Worthington, J. R., Hacker, B. R., and Zandt, G.: Distinguishing eclogite from
peridotite: EBSD-based calculations of seismic velocitites, Geophys. J. Int.
Seism., 193, 489–505,
https://doi.org/10.1093/gji/ggt004, 2013.
Yan, Z., Clayton, R. W., and Saleeby, J.: Seismic refraction evidence for
steep faults cutting highly attenuated continental basement in the central
transverse ranges, California, Geophys. J. Int., 160, 651–666, 2005.
Zappone, A., Fernàndez, M., García-Duenas, V., and Burlini, L.:
Laboratorymeasurements of seismic P-wave velocities on rocks from the Betic
chain (southern Iberian Peninsula), Tectonophysics 317, 259–272, 2000.
Zel, I. Y., Ivankina, T. I., Levin, D. M., and Lokajicek, T.: P-wave ray velocities
and the inverse acoustic problem for anisotropic media, Crystallography
Reports, 61, 623–629, 2016.
Zertani, S., John, T., Tilmann, F., Motra, H. B., Keppler, R., Andersen, T.
B., and Labrousse, L.: Modification of the seismic properties of subducting
continental crust by eclogitization and deformation processes, J. Geophys. Res.-Sol. Ea., 124, 9731–9754, 2019.
Zertani, S., Vrijmoed, J. C., Tilmann, F., John, T., Andersen, T. B., and
Labrousse, L.: P wave anisotropy caused by partial eclogitiation of
descending crust demonstrated by modeling effective petrophysical
properties, Geochem. Geophys. Geosys., 21, e2019GC008906, https://doi.org/10.1029/2019GC008906, 2020.
Zhang, J. F., Wang, Y. F., and Jin, Z. M.: CPO-induced seismic anisotropy in
UHP eclogites, Sci. China Ser D-Earth Sci., 51, 11–21, 2008.
Zhang, J. J., Santosh, M., Wang, X. X., Guo, L., Yang, X. G., and Zhang, B.:
Tectonics of the northern Himalaya since the India–Asia collision, Gondwana
Res., 21, 939–960, 2012.
Short summary
Rocks in mountain belts have been deformed during continental collision causing a certain alignment of the minerals referred to as crystallographic preferred orientation (CPO). Minerals have anisotropic properties: the velocity of seismic waves travelling through them is direction dependent. This leads to anisotropy of the rocks. We measured the CPO of common rocks within the Alps. With this data and known anisotropic properties of the minerals we calculated the seismic anisotropy of the rocks.
Rocks in mountain belts have been deformed during continental collision causing a certain...
