Articles | Volume 7, issue 5
https://doi.org/10.5194/se-7-1405-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/se-7-1405-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
19 Oct 2016
Research article |
| 19 Oct 2016
Ionospheric influence on the seismo-telluric current related to electromagnetic signals observed before the Wenchuan MS 8.0 earthquake
China Earthquake Networks Center, China Earthquake Administration, No. 5,
Sanlihe Nanheng Street, Xicheng District, 100045 Beijing, China
China University of Geosciences, No. 29, Xueyuan Road, Haidian District,
100083 Beijing, China
Handong Tan
China University of Geosciences, No. 29, Xueyuan Road, Haidian District,
100083 Beijing, China
Meng Cao
China University of Geosciences, No. 29, Xueyuan Road, Haidian District,
100083 Beijing, China
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In order to check the relationship between ground-based electromagnetic anomaly and ionospheric effect before the famous Wenchuan MS 8.0 earthquake, three physical models have been established to simulate the communication process of electromagnetic energy from the Wenchuan hypocenter to the Earth’s surface, via the atmosphere to the ionosphere to cause ionospheric variations.
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A statistical method is tentatively utilized to study distribution properties of aftershocks of the Wenchuan sequence in the view of energy release. The results show that the events in the Wenchuan sequence are not independent but have mutual attraction, their spatio–temporal distribution tends to be nonrandom but definite and deterministic, and imply it is possible for energy release to be predicted, although we cannot accurately predict the occurrence time and locations of the imminent event.
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In order to check the relationship between ground-based electromagnetic anomaly and ionospheric effect before the famous Wenchuan MS 8.0 earthquake, three physical models have been established to simulate the communication process of electromagnetic energy from the Wenchuan hypocenter to the Earth’s surface, via the atmosphere to the ionosphere to cause ionospheric variations.
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A statistical method is tentatively utilized to study distribution properties of aftershocks of the Wenchuan sequence in the view of energy release. The results show that the events in the Wenchuan sequence are not independent but have mutual attraction, their spatio–temporal distribution tends to be nonrandom but definite and deterministic, and imply it is possible for energy release to be predicted, although we cannot accurately predict the occurrence time and locations of the imminent event.
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Martin Peter Lipus, Felix Schölderle, Thomas Reinsch, Christopher Wollin, Charlotte Krawczyk, Daniela Pfrang, and Kai Zosseder
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Jean-Baptiste P. Koehl, Craig Magee, and Ingrid M. Anell
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Andrei Maksymowicz, Daniela Montecinos-Cuadros, Daniel Díaz, María José Segovia, and Tomás Reyes
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This work analyses the density structure of the continental forearc in the northern segment of the 1960 Mw 9.6 Valdivia earthquake. Results show a segmentation of the continental wedge along and perpendicular to the margin. The extension of the less rigid basement units conforming the marine wedge and Coastal Cordillera domain could modify the process of stress loading during the interseismic periods. This analysis highlights the role of the overriding plate on the seismotectonic process.
Hossein Hassani, Felix Hloušek, Stefan Buske, and Olaf Wallner
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Passive seismic imaging methods use natural earthquakes as seismic sources, while in active seismic imaging methods, artificial sources (e.g. explosives) are used to generate seismic waves. We imaged some structures related to a major fault plane through a passive seismic imaging approach using microearthquakes with magnitudes smaller than 0.9 (Mw). These structures have not been illuminated by a previously conducted 3D active seismic survey due to their large dip angles.
Maximilian O. Kottwitz, Anton A. Popov, Steffen Abe, and Boris J. P. Kaus
Solid Earth, 12, 2235–2254, https://doi.org/10.5194/se-12-2235-2021, https://doi.org/10.5194/se-12-2235-2021, 2021
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Klaus Regenauer-Lieb, Manman Hu, Christoph Schrank, Xiao Chen, Santiago Peña Clavijo, Ulrich Kelka, Ali Karrech, Oliver Gaede, Tomasz Blach, Hamid Roshan, Antoine B. Jacquey, Piotr Szymczak, and Qingpei Sun
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Yinshuai Ding and Alireza Malehmir
Solid Earth, 12, 1707–1718, https://doi.org/10.5194/se-12-1707-2021, https://doi.org/10.5194/se-12-1707-2021, 2021
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In this article, we investigate the potential of reverse time migration (RTM) for deep targeting iron oxide deposits and the possible AVO effect that is potentially seen in the common image gathers from this migration algorithm. The results are promising and help to delineate the deposits and host rock structures using a 2D dataset from the Ludvika mines of central Sweden.
Nikita Afonin, Elena Kozlovskaya, Suvi Heinonen, and Stefan Buske
Solid Earth, 12, 1563–1579, https://doi.org/10.5194/se-12-1563-2021, https://doi.org/10.5194/se-12-1563-2021, 2021
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In our study, we show the results of a passive seismic interferometry application for mapping the uppermost crust in the area of active mineral exploration in northern Finland. The obtained velocity models agree well with geological data and complement the results of reflection seismic data interpretation.
Puy Ayarza, José Ramón Martínez Catalán, Ana Martínez García, Juan Alcalde, Juvenal Andrés, José Fernando Simancas, Immaculada Palomeras, David Martí, Irene DeFelipe, Chris Juhlin, and Ramón Carbonell
Solid Earth, 12, 1515–1547, https://doi.org/10.5194/se-12-1515-2021, https://doi.org/10.5194/se-12-1515-2021, 2021
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Vertical incidence seismic profiling on the Iberian Massif images a mid-crustal-scale discontinuity at the top of the reflective lower crust. This feature shows that upper- and lower-crustal reflections merge into it, suggesting that it has often behaved as a detachment. The orogen-scale extension of this discontinuity, present in Gondwanan and Avalonian affinity terranes into the Iberian Massif, demonstrates its relevance, leading us to interpret it as the Conrad discontinuity.
Peter-Lasse Giertzuch, Joseph Doetsch, Alexis Shakas, Mohammadreza Jalali, Bernard Brixel, and Hansruedi Maurer
Solid Earth, 12, 1497–1513, https://doi.org/10.5194/se-12-1497-2021, https://doi.org/10.5194/se-12-1497-2021, 2021
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Two time-lapse borehole ground penetrating radar (GPR) surveys were conducted during saline tracer experiments in weakly fractured crystalline rock with sub-millimeter fractures apertures, targeting electrical conductivity changes. The combination of time-lapse reflection and transmission GPR surveys from different boreholes allowed monitoring the tracer flow and reconstructing the flow path and its temporal evolution in 3D and provided a realistic visualization of the hydrological processes.
Irene Bianchi, Elmer Ruigrok, Anne Obermann, and Edi Kissling
Solid Earth, 12, 1185–1196, https://doi.org/10.5194/se-12-1185-2021, https://doi.org/10.5194/se-12-1185-2021, 2021
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The European Alps formed during collision between the European and Adriatic plates and are one of the most studied orogens for understanding the dynamics of mountain building. In the Eastern Alps, the contact between the colliding plates is still a matter of debate. We have used the records from distant earthquakes to highlight the geometries of the crust–mantle boundary in the Eastern Alpine area; our results suggest a complex and faulted internal crustal structure beneath the higher crests.
Saeid Cheraghi, Alireza Malehmir, Mostafa Naghizadeh, David Snyder, Lucie Mathieu, and Pierre Bedeaux
Solid Earth, 12, 1143–1164, https://doi.org/10.5194/se-12-1143-2021, https://doi.org/10.5194/se-12-1143-2021, 2021
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High-resolution seismic profiles in 2D are acquired in the north and south of the Chibougamau area, Quebec, Canada located in the northeast of the Abitibi Greenstone belt. The area mostly includes volcanic rocks, and both profiles cross over several fault zones. The seismic method is acquired to image the subsurface down to depth of 12 km. The main aim of this study is to image major fault zones and the geological formations connected to those faults to investigate metal endowment in the area.
Jean-Baptiste P. Koehl
Solid Earth, 12, 1025–1049, https://doi.org/10.5194/se-12-1025-2021, https://doi.org/10.5194/se-12-1025-2021, 2021
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By using seismic data and fieldwork, this contribution shows that soft, coal-rich sedimentary rocks absorbed most of early Cenozoic, Eurekan, contractional deformation in central Spitsbergen, thus suggesting that no contractional deformation event is needed in the Late Devonian to explain the deformation differences among late Paleozoic sedimentary rocks. It also shows that the Billefjorden Fault Zone, a major crack in the Earth's crust in Svalbard, is probably segmented.
Gilda Currenti, Philippe Jousset, Rosalba Napoli, Charlotte Krawczyk, and Michael Weber
Solid Earth, 12, 993–1003, https://doi.org/10.5194/se-12-993-2021, https://doi.org/10.5194/se-12-993-2021, 2021
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We investigate the capability of distributed acoustic sensing (DAS) to record dynamic strain changes related to Etna volcano activity in 2019. To validate the DAS measurements, we compute strain estimates from seismic signals recorded by a dense broadband array. A general good agreement is found between array-derived strain and DAS measurements along the fibre optic cable. Localised short wavelength discrepancies highlight small-scale structural heterogeneities in the investigated area.
Klaus Regenauer-Lieb, Manman Hu, Christoph Schrank, Xiao Chen, Santiago Peña Clavijo, Ulrich Kelka, Ali Karrech, Oliver Gaede, Tomasz Blach, Hamid Roshan, and Antoine B. Jacquey
Solid Earth, 12, 869–883, https://doi.org/10.5194/se-12-869-2021, https://doi.org/10.5194/se-12-869-2021, 2021
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In this paper we expand on a recent discovery of slow cross-diffusion hydromechanical waves cast into a new concise reaction–diffusion equation for THMC coupling. If waves are excited through the THMC reaction terms unbounded reactions can be captured by inclusion of statistical information from the lower scale through nonlocal reaction–diffusion equations. These cross-diffusion coefficients regularize extreme earthquake-like events (rogue waves) through a new form of quasi-soliton wave.
Christian Emile Nyaban, Théophile Ndougsa-Mbarga, Marcelin Bikoro-Bi-Alou, Stella Amina Manekeng Tadjouteu, and Stephane Patrick Assembe
Solid Earth, 12, 785–800, https://doi.org/10.5194/se-12-785-2021, https://doi.org/10.5194/se-12-785-2021, 2021
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A multi-scale analysis of aeromagnetic data combining tilt derivative, Euler deconvolution, upward continuation, and 2.75D modelling was applied over Cameroon between the latitudes 5°30'–6° N and the longitudes 13°30'–14°45' E. Major families of faults oriented ENE–WSW, E–W, NW–SE, and N–S with a NE–SW prevalence were mapped. Depths of interpreted faults range from 1000 to 3400 m, mylonitic veins were identified, and 2.75D modelling revealed fault depths greater than 1200 m.
Jennifer E. Cunningham, Nestor Cardozo, Chris Townsend, and Richard H. T. Callow
Solid Earth, 12, 741–764, https://doi.org/10.5194/se-12-741-2021, https://doi.org/10.5194/se-12-741-2021, 2021
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This work investigates the impact of commonly used seismic interpretation methods on the analysis of faults. Fault analysis refers to fault length, displacement, and the impact these factors have on geological modelling and hydrocarbon volume calculation workflows. This research was conducted to give geoscientists a better understanding of the importance of interpretation methods and the impact of unsuitable methology on geological analyses.
Jan Henninges, Evgeniia Martuganova, Manfred Stiller, Ben Norden, and Charlotte M. Krawczyk
Solid Earth, 12, 521–537, https://doi.org/10.5194/se-12-521-2021, https://doi.org/10.5194/se-12-521-2021, 2021
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We performed a seismic survey in two 4.3 km deep geothermal research wells using the novel method of distributed acoustic sensing and wireline cables. The characteristics of the acquired data, methods for data processing and quality improvement, and interpretations on the geometry and structure of the sedimentary and volcanic reservoir rocks are presented. The method enables measurements at high temperatures and reduced cost compared to conventional sensors.
Matthias Bücker, Adrián Flores Orozco, Jakob Gallistl, Matthias Steiner, Lukas Aigner, Johannes Hoppenbrock, Ruth Glebe, Wendy Morales Barrera, Carlos Pita de la Paz, César Emilio García García, José Alberto Razo Pérez, Johannes Buckel, Andreas Hördt, Antje Schwalb, and Liseth Pérez
Solid Earth, 12, 439–461, https://doi.org/10.5194/se-12-439-2021, https://doi.org/10.5194/se-12-439-2021, 2021
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We use seismic, electromagnetic, and geoelectrical methods to assess sediment thickness and lake-bottom geology of two karst lakes. An unexpected drainage event provided us with the unusual opportunity to compare water-borne measurements with measurements carried out on the dry lake floor. The resulting data set does not only provide insight into the specific lake-bottom geology of the studied lakes but also evidences the potential and limitations of the employed field methods.
Alireza Malehmir, Magdalena Markovic, Paul Marsden, Alba Gil, Stefan Buske, Lukasz Sito, Emma Bäckström, Martiya Sadeghi, and Stefan Luth
Solid Earth, 12, 483–502, https://doi.org/10.5194/se-12-483-2021, https://doi.org/10.5194/se-12-483-2021, 2021
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A smooth transition toward decarbonization demands access to more minerals of critical importance. Europe has a good geology for many of these mineral deposits, but at a depth requiring sensitive, environmentally friendly, and cost-effective methods for their exploration. In this context, we present a sparse 3D seismic dataset that allowed identification of potential iron oxide resources at depth and helped to characterise key geological structures and a historical tailing in central Sweden.
Alba Zappone, Antonio Pio Rinaldi, Melchior Grab, Quinn C. Wenning, Clément Roques, Claudio Madonna, Anne C. Obermann, Stefano M. Bernasconi, Matthias S. Brennwald, Rolf Kipfer, Florian Soom, Paul Cook, Yves Guglielmi, Christophe Nussbaum, Domenico Giardini, Marco Mazzotti, and Stefan Wiemer
Solid Earth, 12, 319–343, https://doi.org/10.5194/se-12-319-2021, https://doi.org/10.5194/se-12-319-2021, 2021
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The success of the geological storage of carbon dioxide is linked to the availability at depth of a capable reservoir and an impermeable caprock. The sealing capacity of the caprock is a key parameter for long-term CO2 containment. Faults crosscutting the caprock might represent preferential pathways for CO2 to escape. A decameter-scale experiment on injection in a fault, monitored by an integrated network of multiparamerter sensors, sheds light on the mobility of fluids within the fault.
Juvenal Andrés, Puy Ayarza, Martin Schimmel, Imma Palomeras, Mario Ruiz, and Ramon Carbonell
Solid Earth, 11, 2499–2513, https://doi.org/10.5194/se-11-2499-2020, https://doi.org/10.5194/se-11-2499-2020, 2020
Yi Zhang, Xinglin Lei, Tsutomu Hashimoto, and Ziqiu Xue
Solid Earth, 11, 2487–2497, https://doi.org/10.5194/se-11-2487-2020, https://doi.org/10.5194/se-11-2487-2020, 2020
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Spatially continuous strain responses in two monitoring wells induced by a well-drilling process were monitored using high-resolution fiber-optic distributed strain sensing (DSS). The modeling results suggest that the strain polarities and magnitudes along the wellbores may be indicative of the layered-permeability structure or heterogeneous formation damage. The performance and value of DSS as a novel hydrogeophysical tool for in situ subsurface monitoring are emphasized.
Benjamin Schwarz and Charlotte M. Krawczyk
Solid Earth, 11, 1891–1907, https://doi.org/10.5194/se-11-1891-2020, https://doi.org/10.5194/se-11-1891-2020, 2020
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Intricate fault and fracture networks cut through the upper crust, and their detailed delineation and characterization play an important role in the Earth sciences. While conventional geophysical sounding techniques only provide indirect means of detection, we present scale-spanning field data examples, in which coherent diffraction imaging – a framework inspired by optics and visual perception – enables the direct imaging of these crustal features at an unprecedented spatial resolution.
Laurent Guillou-Frottier, Hugo Duwiquet, Gaëtan Launay, Audrey Taillefer, Vincent Roche, and Gaétan Link
Solid Earth, 11, 1571–1595, https://doi.org/10.5194/se-11-1571-2020, https://doi.org/10.5194/se-11-1571-2020, 2020
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In the first kilometers of the subsurface, temperature anomalies due to heat conduction rarely exceed 20–30°C. However, when deep hot fluids in the shallow crust flow upwards, for example through permeable fault zones, hydrothermal convection can form high-temperature geothermal reservoirs. Numerical modeling of hydrothermal convection shows that vertical fault zones may host funnel-shaped, kilometer-sized geothermal reservoirs whose exploitation would not need drilling at depths below 2–3 km.
Joseph Doetsch, Hannes Krietsch, Cedric Schmelzbach, Mohammadreza Jalali, Valentin Gischig, Linus Villiger, Florian Amann, and Hansruedi Maurer
Solid Earth, 11, 1441–1455, https://doi.org/10.5194/se-11-1441-2020, https://doi.org/10.5194/se-11-1441-2020, 2020
Laura Petrescu, Silvia Pondrelli, Simone Salimbeni, Manuele Faccenda, and the AlpArray Working Group
Solid Earth, 11, 1275–1290, https://doi.org/10.5194/se-11-1275-2020, https://doi.org/10.5194/se-11-1275-2020, 2020
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To place constraints on the mantle deformation beneath the Central Alps and the greater Alpine region, we analysed the appropriate seismic signal recorded by more than 100 stations, belonging to AlpArray and to other permanent networks. We took a picture of the imprinting that Alpine orogen history and related subductions left at depth, with a mainly orogen-parallel mantle deformation from Western Alps to Eastern Alps, but also N to S from the Po Plain to the Rhine Graben.
Cited articles
Akhoondzadeh, M., Parrot, M., and Saradjian, M. R.: Electron and ion density variations before strong earthquakes (M > 6.0) using DEMETER and GPS data, Nat. Hazards Earth Syst. Sci., 10, 7–18, https://doi.org/10.5194/nhess-10-7-2010, 2010.
Bernardi, A., Fraser–Smith, A. C., McGill, P. R., and Villard Jr., O. G.: Magnetic field measurements near the epicenter of the MS7.1 Loma Prieta earthquake, Phys. Earth Planet Interiors, 68, 45–63, 1991.
Bortnik, J., Bleier, T. E., Dunson, C., and Freund, F.: Estimating the seismotelluric current required for observable electromagnetic ground signals, Ann. Geophys., 28, 1615–1624, https://doi.org/10.5194/angeo-28-1615-2010, 2010.
Cummer, S. A.: Modeling Electromagnetic Propagation in the Earth–Ionosphere Waveguide, IEEE T. Antenn. Propag., 48, 2–12, 2000.
Draganov, A. B., Inan, U. S., and Taranenko, Y. N.: ULF magnetic signatures at the Earth due to groundwater flow: a possible precursor to earthquakes, Geophys. Res. Lett., 18, 1127–1130, 1991.
Eftaxias, K., Kapiris, P., Polygiannakis, J., Peratzakis, A., Kopanas, J., Antonopoulos, G., and Rigas, D.: Experience of short term earthquake precursors with VLF-VHF electromagnetic emissions, Nat. Hazards Earth Syst. Sci., 3, 217–228, https://doi.org/10.5194/nhess-3-217-2003, 2003.
Egbert, G. D.: On the generation of ULF magnetic variations by conductivity fluctuations in a fault zone, Pure Appl. Geophys., 159, 1205–1227, 2002.
Fenoglio, M. A., Johnston, M. J. S., and Byerlee J. D.: Magnetic and electric fields associated with changes in high pore pressure in fault zones: application to the Loma Prieta ULF emissions, J. Geophys. Res., 100, 951–958, 1995.
Fraser-Smith, A. C., Bernardi, A., McGill, P. R., Ladd, M. E., Helliwell, R. A., and Villard Jr., O. G.: Low–frequency magnetic measurements near the epicenter of the MS7.1 Loma Prieta earthquake, Geophys. Res. Lett., 17, 1465–1468, 1990.
Freund, F.: Charge generation and propagation in igneous rocks, J. Geodynamics, 33, 543–570, 2002.
Freund, F.: Stress-activated positive hole charge carriers in rocks and the generation of pre-earthquake signals, in: Electromagnetic Phenomena Associated with Earthquakes, edited by: Hayakawa, M., Transworld Research Network, Trivandrum, India, 3, 41–96, 2009.
Freund, F.: Toward a unified solid state theory for pre–earthquake signals, Acta Geophys., 58, 719–766, 2010.
Freund, F. and Wengeler, H.: The infrared spectrum of OH−compensated defect sites in C–doped MgO and CaO single crystals, J. Phys. Chem. Solids, 43, 129–145, 1982.
Freund, F. and Sornette, D.: Electro–magnetic earthquake bursts and critical rupture of peroxy bond networks in rocks, Tectonophysics, 431, 33–47, 2007.
Fu, C. M., Di, Q. Y., Xu, C., and Wang, M. Y.: Electromagnetic fields for different type sources with effect of the ionosphere, Chinese J. Geophys., 55, 3958–3968, https://doi.org/10.6038/j.issn.0001-5733.2012.12.008, 2012 (in Chinese with English abstract).
Guan, H. P., Han, F. Y., Xiao, W. J., and Chen, Z. Y.: ULF electromagnetic observation and data processing methods, Earthquake, 23, 5–93, 2003 (in Chinese with English abstract).
Hayakawa, M. and Molchanov, O. A. (Eds.): Seismo–Electromagnetics: Lithosphere-Atmosphere-Ionosphere Coupling, Tokyo, Japan: TERRAPUB, 2002.
Hao, J., Qian, S., Zhou, J., and Zhu, T.: ULF electric and magnetic anomalies accompanying the cracking of rock sample, Acta Seismol. Sin., 25, 102–111, 2003 (in Chinese with English abstract).
Kamogawa, M.: Pre-seismic lithosphere-atmosphere-ionosphere coupling, Eos, 87, 417–424, 2006.
Key, K.: 1-D inversion of multicomponent, multi–frequency marine CSEM data: Methodology and synthetic studies for resolving thin resistive layers, Geophysics, 74, F9–F20, 2009.
Kopytenko, Y. A., Matiashvili, T. G., Voronov, P. M., Kopytenko, E. A., and Molchanov, O. A.: Detection of ultra–low frequency emissions connected with the Spitak earthquake and its aftershock activity, based on geomagnetic pulsations data at Dusheti and Vardzia observatories, Phys. Earth Planet. Interiors, 77, 85–95, 1993.
Kuo, C. L., Huba, J. D., Joyce, G., and Lee, L. C.: Ionosphere plasma bubbles and density variations induced by pre–earthquake rock currents and associated surface charges, J. Geophys. Res., 116, A10317, https://doi.org/10.1029/2011JA016628, 2011.
Kuo, C. L., Lee, L. C., and Huba, J. D.: An improved coupling model for the lithosphere-atmosphere-ionosphere system, J. Geophys. Res.-Space, 119, 3189–3205, 2014.
Li, M., Lu, J., Parrot, M., Tan, H., Chang, Y., Zhang, X., and Wang, Y.: Review of unprecedented ULF electromagnetic anomalous emissions possibly related to the Wenchuan MS = 8.0 earthquake, on 12 May 2008, Nat. Hazards Earth Syst. Sci., 13, 279–286, https://doi.org/10.5194/nhess-13-279-2013, 2013.
Li, D., Di, Q. Y., and Wang, M. Y.: One-dimensional electromagnetic fields forward modeling for “Earth-ionosphere” mode, Chinese J. Geophys., 54, 2375–2388, https://doi.org/10.3969/j.issn.0001–5733.2011.09.021, 2011 (in Chinese with English abstract).
Li, Y., Lin, P. R., Zheng, C. J., Shi, F. S., Xu, B. L., and Guo, P.: The electromagnetic response modeling of the ELF method and the influence of the ionosphere, Geophysical & Geochemical Exploration, 34, 332–339, 2010a (in Chinese with English abstract).
Li, D. Q., Di, Q. Y., and Wang, M. Y.: Study of large scale large power control source electromagnetic with “Earth–ionosphere” mode, Chinese J. Geophys., 53, 411–420, https://doi.org/10.3969/j.issn.0001-5733.2010.02.019, 2010b (in Chinese with English abstract).
Molchanov, O., Fedorov, E., Schekotov, A., Gordeev, E., Chebrov, V., Surkov, V., Rozhnoi, A., Andreevsky, S., Iudin, D., Yunga, S., Lutikov, A., Hayakawa, M., and Biagi, P. F.: Lithosphere-atmosphere-ionosphere coupling as governing mechanism for preseismic short-term events in atmosphere and ionosphere, Nat. Hazards Earth Syst. Sci., 4, 757–767, https://doi.org/10.5194/nhess-4-757-2004, 2004.
Molchanov, O. A., Kopytenko, Y. A., Voronov, P. M., Kopytenko, E. A., Matiashvili, T. G., Fraser-Smith, A. C., and Bernardi, A.: Results of ULF Magnetic field measurements near the epicenters of the Spitak (MS6.9) and Loma Prieta (MS7.1) earthquakes: comparative analysis, Geophys. Res. Lett., 19, 1495–1498, 1992.
Namgaladze, A. A., Zolotov, O. V., Karpov, M. I., and Romanovskaya, Y. V.: Manifestations of the earthquake preparations in the ionosphere total electron content variations, Nat. Sci., 4, 848–855, 2012.
Ohta, K., Umeda, K., Watanabe, M., and Hayakawa, M.: Relationship between ELF magnetic field and Taiwan earthquake, in: Lithosphere–Atmosphere–Ionosphere Coupling, edited by: Hayakawa, M. and Molchanov, O. A., Terra Science Publishers, Tokyo, 233–237, 2002.
Park, S. K.: Precursors to earthquakes: seismo–electromagnetic signals, Surv. Geophys., 17, 493–516, 1996.
Pulinets, S. A. and Ouzounov, D.: Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) model–An unified concept for earthquake precursors validation, J. Southeast Asian Earth Sci., 41, 371–382, 2011.
Pulinets, S. A. and Davidenko, D.: Ionospheric precursors of earthquakes and Global Electric Circuit, Adv. Space Res., 53, 709–723, 2014.
Pulinets, S. A., Legen'ka, A. D., and Alekseev, V. A.: Pre-earthquakes effects and their possible mechanisms. In: Dusty and Dirty Plasmas, Noise and Chaos in Space and in the Laboratory, Plenum Publishing, New York, 545–557, 1994.
Pulinets, S. A., Boyarchuk, K. A., Hegai, V. V., Kim, V. P., and Lomonosov, A. M.: Quasielectrostatical model of atmosphere-thermosphere-ionosphere coupling, Adv. Space Res., 26, 1209–1218, 2000.
Qian, S., Ren K., and Lü, Z.: Experimental study on VLF, MF, HF and VHF electromagnetic radiation characteristics with the rock breaking, Earthquake Science, 18, 346–351, 1996 (in Chinese with English abstract).
Qian, S., Hao, J., Zhou, J., and Gao, J.: Simulating experimental study on ULF electromagnetic precursors before Jiji MS = 7.4 earthquake, in: Lithosphere-Atmosphere-Ionosphere Coupling, edited by: Hayakawa, M. and Molchanov, O. A., Terra Science Publishers, Tokyo, 49–53, 2002.
Qian, S., Hao, J., Zhou, J., and Gao, J.: Precursory Electric and Magnetic Signals at ULF and LF Bands during the Fracture of Rocks under Pressure, Earthquake Research in China, 19, 109–116, 2003 (in Chinese with English abstract).
Sarlis, N., Lazaridou, M., Kapiris, P., and Varotsos, P.: Numerical model of the selectivity effect and the V/L criterion, Geophys. Res. Lett., 26, 3245–3248, 1999.
Scoville, J., Sornette, J., and Freund, F.: Paradox of peroxy defects and positive holes in rocks Part II: Outflow of electric currents from stressed rocks, J. Asian Earth Sci., 114, 338–351, 2015.
Simpson, J. J. and Taflove, A.: Electrokinetic effect of the Loma Prieta earthquake calculated by an entire–Earth FDTD solution of Maxwell's equations, Geophys. Res. Lett., 32, L09302, https://doi.org/10.1029/2005GL022601, 2005.
Sorokin, V. M. and Hayakawa, M.: Generation of Seismic–Related DC Electric Fields and Lithosphere–Atmosphere–Ionosphere Coupling, Modern Appl. Sci., 7, 1–25, 2013.
Sorokin, V. M. and Hayakawa, M.: Plasma and Electromagnetic Effects Caused by the Seismic–Related Disturbances of Electric Current in the Global Circuit, Modern Appl. Sci., 8, 61–83, 2014.
Uyeda, S., Nagao, T., Orihara, Y., Yamaguchi, T., and Takahashi I.: Geoelectric potential changes: Possible precursors to earthquakes in Japan, P. Natl. Acad. Sci. USA, 97, 4561–4566, 2000.
Varotsos, P. and Lazaridou, M.: Latest aspects of earthquake prediction in Greece based on seismic electric signals, Tectonophysics, 188, 321–347, 1991.
Varotsos, P., Sarlis, N., and Lazaridou, M.: Transmission of stress induced electric signals in dielectric media, Part II, Acta Geophys., 48, 141–177, 2000.
Varotsos, P., Sarlis, N., Skordas, E., Tanaka, H., and Lazaridou, M.: Additional evidence on some relationship between seismic electric signals and earthquake source parameters, Acta Geophys., 53, 293–298, 2005.
Wait, J. R.: Geo–electromagnetism: Academic Press, 1982.
Wait, J. R.: Some Factors Concerning Electromagnetic Wave Propagation in the Earth's Crust, Proc. IEEE, 54, August 1966.
Xu, C., Di, Q. Y., Fu, C. M., and Wang, M. Y.: The contrast of response characteristics between large power long dipole and circle source, Chinese J. Geophys., 55, 2097–2104, https://doi.org/10.6038/j.issn.0001-5733.2012.06.03, 2012 (in Chinese with English abstract).
Xu, T., Hu, Y., Wu, J., Wu, Z., Suo, Y., and Feng, J.: Giant disturbance in the ionospheric F2 region prior to the M8.0 Wenchuan earthquake on 12 May 2008, Ann. Geophys., 28, 1533–1538, 2010.
Xu, X. W.: Album of 5.12 Wenchuan 8.0 earthquake surface ruptures, Seismological press, 2009 (in Chinese with English abstract).
Yu, T., Mao, T., Wang, Y. G., and Wang, J. S.: Study of the ionospheric anomaly before the Wenchuan earthquake, Chinese Sci. Bull., 54, 1086–1092, https://doi.org/10.1007/s11434-008-0587-8, 2009 (in Chinese with English abstract).
Zeng, Z. C., Zhang, B., Fang, G. Y., Wang, D. F., and Yin, H. J.: The analysis of ionospheric variations before Wenchuan earthquake with DEMETER data, Chinese J. Geophys., 52, 11–19, 2009 (in Chinese with English abstract).
Zhang, Y., Feng, W. P., Xu, L. S., Zhou, C. H., and Chen, Y. T.: Spatio–temporal rupture process of the 2008 great Wenchuan earthquake, Science China Ser. D, 52, 145–154, 2009a.
Zhang, X., Shen, X., Liu, J., Ouyang, X., Qian, J., and Zhao, S.: Analysis of ionospheric plasma perturbations before Wenchuan earthquake, Nat. Hazards Earth Syst. Sci., 9, 1259–1266, https://doi.org/10.5194/nhess-9-1259-2009, 2009b.
Zhuang, J., Vere-Jones, D., Guan, H., Ogata, Y., and Ma, L.: Preliminary analysis of observations on the ultra-low frequency electric field in the Beijing region, Pure Appl. Geophys., 162, 1367–1396, 2005.
Zhu, Y. T., Wang, X. B., Yu, N., Gao, S. Q., Li, K., and Shi, Y. J.: Longmenshan magnetotelluric deep structure and the Wenchuan earthquake (MS8.0), Acta Geologica Sinica, 82, 1769–777, 2008 (in Chinese with English abstract).
Zolotov, O. V.: Ionosphere Quasistatic Electric Fields Disturbances over Seismically Active Regions as Inferred from Satellite–Based Observations: A Review, Russian Journal of Physical Chemistry B, 9, 85–788, 2015.
Zolotov, O. V., Namgaladze, A. A., Zakharenkova, I. E., Martynenko, O. V., and Shagimuratov, I. I.: Physical Interpretation and Mathematical Simulation of Ionospheric Precursors of Earthquakes at Midlatitudes, Geomagnetism Aeronomy, 52, 390–397, 2012.
Short summary
The paper focuses on the enhancement of the electromagnetic signal in the
waveguide between the surface of the Earth and ionosphere. The ionosphere can facilitate the electromagnetic wave propagation, as if the detectability of the observing system is improved effectively, which makes it reasonable that sometimes electromagnetic signals are recorded at a seemingly unreasonable distance.
The paper focuses on the enhancement of the electromagnetic signal in the
waveguide between the...
