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Journal articles on the topic 'Fluid in the seismogenic process'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

Parry, W. T., and R. L. Bruhn. "Fluid pressure transients on seismogenic normal faults." Tectonophysics 179, no. 3-4 (1990): 335–44. http://dx.doi.org/10.1016/0040-1951(90)90299-n.

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Liao, Chun-Fu, Strong Wen, Chau-Huei Chen, and Ying-Nien Chen. "Exploring the Rheology of a Seismogenic Zone by Applying Seismic Variation." Applied Sciences 11, no. 19 (2021): 8847. http://dx.doi.org/10.3390/app11198847.

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Although the study of spatiotemporal variation of a subsurface velocity structure is a challenging task, it can provide a description of the fault geometry as well as important information on the rheological changes caused by fault rupture. Our main objective is to investigate whether rheological changes of faults can be associated with the seismogenic process before a strong earthquake. For this purpose, a 3D tomographic technique is applied to obtain P- and S-wave velocity structures in central Taiwan using travel time data. The results show that temporal variations in the Vs structure in th

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3

Marchesini, Barbara, Paolo Stefano Garofalo, Luca Menegon, Jussi Mattila, and Giulio Viola. "Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 1: Fluid record and deformation history of fault veins in a nuclear waste repository (Olkiluoto Island, Finland)." Solid Earth 10, no. 3 (2019): 809–38. http://dx.doi.org/10.5194/se-10-809-2019.

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Abstract. The dynamic evolution of fault zones at the seismogenic brittle–ductile transition zone (BDTZ) expresses the delicate interplay between numerous physical and chemical processes. Deformation and fluid flow at the BDTZ are closely related and mutually dependent during repeating and transient cycles of frictional and viscous deformation. Despite numerous studies documenting in detail seismogenic faults exhumed from the BDTZ, uncertainties remain as to the exact role of fluids in facilitating broadly coeval brittle and ductile deformation at that structural level. We combine structural a

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4

Wen, Yangmao, Zhuohui Xiao, Ping He, Jianfei Zang, Yang Liu, and Caijun Xu. "Source Characteristics of the 2020 Mw 7.4 Oaxaca, Mexico, Earthquake Estimated from GPS, InSAR, and Teleseismic Waveforms." Seismological Research Letters 92, no. 3 (2021): 1900–1912. http://dx.doi.org/10.1785/0220200313.

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Abstract On 23 June 2020, an Mw 7.4 earthquake struck offshore Oaxaca, Mexico, providing a unique opportunity to understand the seismogenic tectonics of the Mexican subduction zone. In this study, near-field coseismic deformation caused by the event was retrieved from Global Positioning System (GPS) observations and Interferometric Synthetic Aperture Radar (InSAR) measurements. Given static geodetic measurements, high-rate GPS waveforms, and teleseismic waveforms, the fault geometry and rupture process for the 2020 Oaxaca earthquake were robustly determined by nonlinear joint inversions. The m

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Qu, Rui, Yingfeng Ji, Weiling Zhu, Youjia Zhao, and Ye Zhu. "Fast and Slow Earthquakes in Alaska: Implications from a Three-Dimensional Thermal Regime and Slab Metamorphism." Applied Sciences 12, no. 21 (2022): 11139. http://dx.doi.org/10.3390/app122111139.

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Fast and slow earthquakes are predominantly generated along faults constituting active plate boundaries. Characterized by repeated devastating earthquakes and frequent slow slip events and tremors, the Alaska megathrust presents a chance to understand the complicated dynamics of a subduction system changing from steep to shallow dips associated with enigmatically abundant fast and slow seismic events. Based on three-dimensional thermal modeling, we find that the downgoing metamorphosed oceanic crust containing bound water releases a large amount of fluid and causes the recurrence of fast and s

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Shukla, Matsyendra Kumar, Piyal Halder, Kamlesh Kumar, and Anupam Sharma. "Fluid–rock interaction in the basement granitoids: A plausible answer to recurring seismicity." Journal of Palaeosciences 72, no. 1 (2023): 1–8. http://dx.doi.org/10.54991/jop.2023.1853.

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The Koyna–Warna Seismogenic Region in the western part of the Indian Subcontinent has been recognized as one of the most significant sites of Reservoir–Triggered–Seismicity (RTS) during the last five decades. The basement granitoids, overlain by the porous and vesicular Deccan Trap basalt, contain numerous interconnecting fractures which act as the ascending and descending pathways of fluid flow. As a result of this fluid flow along fractures, the host rock has been subjected to significant chemical alteration along with the subsequent formation of some new minerals at the expense of a few oth

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Petrosino, Simona, and Paola Cusano. "Low frequency seismic source investigation in volcanic environment: the Mt. Vesuvius atypical case." Advances in Geosciences 52 (June 10, 2020): 29–39. http://dx.doi.org/10.5194/adgeo-52-29-2020.

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Abstract. We present a detailed analysis of the low frequency seismicity occurred at Mt. Vesuvius in the time range 2003–2018. This kind of seismicity is atypical for the volcano and poorly studied, therefore we characterized it in terms of spectral analysis, waveform cross-correlation, location and polarization properties. The different decay patterns of the spectra, the existence of both earthquake families as well as single events, the relatively wide seismogenic volume inferred from the locations and polarization features, indicate that the events are caused by distinct source mechanisms:

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Liu, Qinqin, Angelo De Santis, Alessandro Piscini, Gianfranco Cianchini, Guido Ventura, and Xuhui Shen. "Multi-Parametric Climatological Analysis Reveals the Involvement of Fluids in the Preparation Phase of the 2008 Ms 8.0 Wenchuan and 2013 Ms 7.0 Lushan Earthquakes." Remote Sensing 12, no. 10 (2020): 1663. http://dx.doi.org/10.3390/rs12101663.

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A multi-parametric approach was applied to climatological data before the Ms 8.0 2008 Wenchuan and Ms 7.0 2013 Lushan earthquakes (EQs) in order to detect anomalous changes associated to the preparing phase of those large seismic events. A climatological analysis for seismic Precursor Identification (CAPRI) algorithm was used for the detection of anomalies in the time series of four parameters (aerosol optical depth, AOD; skin temperature, SKT; surface latent heat flux, SLHF and total column water vapour, TCWV). Our results show a chain of processes occurred within two months before the EQs: A

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9

Hidayat, Wahyu, David P. Sahara, Sri Widiyantoro, et al. "Testing the Utilization of a Seismic Network Outside the Main Mining Facility Area for Expanding the Microseismic Monitoring Coverage in a Deep Block Caving." Applied Sciences 12, no. 14 (2022): 7265. http://dx.doi.org/10.3390/app12147265.

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In the case of mining in an inclined intrusion using the block caving method, the highest stress is usually concentrated in the seismogenic and abutment zones, especially in the front of the sloping area. In an inclined intrusion of more than 40°, the seismometer network is usually distributed in the facility area where the footwall area is also located. This causes a limitation in microseismic monitoring due to ray coverage. In this study, we conduct a seismometer deployment outside a mining facilities area with borehole seismometers. The study aims to maximize the resolution and minimize the

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Console, Rodolfo, Paola Vannoli, and Roberto Carluccio. "Physics-Based Simulation of Sequences with Foreshocks, Aftershocks and Multiple Main Shocks in Italy." Applied Sciences 12, no. 4 (2022): 2062. http://dx.doi.org/10.3390/app12042062.

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We applied a new version of physics-based earthquake simulator upon a seismogenic model of the Italian seismicity derived from the latest version of the Database of Individual Seismogenic Sources (DISS). We elaborated appropriately for their use within the simulator all fault systems identified in the study area. We obtained synthetic catalogs spanning hundreds of thousands of years. The resulting synthetic seismic catalogs exhibit typical magnitude, space and time features that are comparable to those obtained by real observations. A typical aspect of the observed seismicity is the occurrence

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11

Duan, Yushi, Jingshan Bo, Da Peng, Qi Li, Wei Wan, and Wenhao Qi. "Analysis of Peak Ground Acceleration and Seismogenic Fault Characteristics of the Mw7.8 Earthquake in Turkey." Applied Sciences 13, no. 19 (2023): 10896. http://dx.doi.org/10.3390/app131910896.

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A Mw7.8 earthquake struck Turkey on 6 February 2023, causing severe casualties and economic losses. This paper investigates the characteristics of strong ground motion and seismogenic fault of the earthquake. We collected and processed the strong ground motion records of 379 stations using Matlab, SeismoSignal, and Surfer software: Matlab (Version R2016a), SeismoSignal (Version 5.1.0), and Surfer (Version 23.0.15), and obtained the peak ground acceleration (PGA) contour map. We analyzed the near-fault effect, the fault locking segment effect, and the trampoline effect of the earthquake based o

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12

Si, Kai, Zhendong Cui, Ruidong Peng, Leilei Zhao, and Yan Zhao. "Crack Propagation Process and Seismogenic Mechanisms of Rock Due to the Influence of Freezing and Thawing." Applied Sciences 11, no. 20 (2021): 9601. http://dx.doi.org/10.3390/app11209601.

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A common problem in cold regions is the influence of freeze–thaw damage on the stability of rock engineering. Therefore, a series of uniaxial compression tests of sandstone after freeze–thaw treatment was carried out in this study. The purpose was to express the initial damage of rock after freezing and thawing treatment more quantitatively and to study the influence of freeze–thaw damage on the rock crack growth process to provide some reference for the stability evaluation of rock engineering in cold regions. The results showed that the number of freeze–thaw cycles and the lowest freeze–thaw

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13

Jiménez-Millán, J., I. Abad, P. Hernández-Puentes, and R. Jiménez-Espinosa. "Influence of phyllosilicates and fluid–rock interaction on the deformation style and mechanical behaviour of quartz-rich rocks in the Carboneras and Palomares fault areas (SE Spain)." Clay Minerals 50, no. 5 (2015): 619–38. http://dx.doi.org/10.1180/claymin.2015.050.5.06.

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AbstractDeformed quartzitic rocks from the Carboneras and Palomares fault areas (SE Spain) are enriched in phyllosilicates compared to their respective protoliths. Deformation is mainly localized in highly foliated chlorite-rich bands. Quartz-rich bands show brittle deformation developing dolomite-rich cross-cutting veins re-cementing microcataclasite areas. Undamaged lenses within the cataclastic rocks contain patches of phyllosilicates with randomly oriented chlorite and mica. Mg, Fe, water, As and Zn enrichment of the damaged rocks suggests a process of hydrothermal chloritization associate

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14

Behr, Whitney M., and Roland Bürgmann. "What’s down there? The structures, materials and environment of deep-seated slow slip and tremor." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2193 (2021): 20200218. http://dx.doi.org/10.1098/rsta.2020.0218.

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Deep-seated slow slip and tremor (SST), including slow slip events, episodic tremor and slip, and low-frequency earthquakes, occur downdip of the seismogenic zone of numerous subduction megathrusts and plate boundary strike-slip faults. These events represent a fascinating and perplexing mode of fault failure that has greatly broadened our view of earthquake dynamics. In this contribution, we review constraints on SST deformation processes from both geophysical observations of active subduction zones and geological observations of exhumed field analogues. We first provide an overview of what h

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15

Li, Wei, Yutong Huang, Xiaohang Wang, et al. "Source Model and Seismogenic Environment of the Ms 6.4 Yangbi Earthquake in Yunnan, China—Based on InSAR Observation." Applied Sciences 12, no. 12 (2022): 5908. http://dx.doi.org/10.3390/app12125908.

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On 21 May 2021, an Ms 6.4 earthquake struck Yangbi County, Dali Prefecture, Yunnan Province, China, which is the largest earthquake to hit this area since 1976. In this paper, we obtained the coseismic deformation of the Yangbi earthquake in Yunnan Province based on the interferometric synthetic aperture radar (InSAR) observation. After that, we obtained the fault geometry and slip distribution model of this earthquake via the two-step inversion method. The maximum deformation in the ascending orbit along the line of sight (LOS) direction was 7.3 cm, and the maximum deformation in the descendi

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16

Lobkovsky, Leopold I., Irina S. Vladimirova, Yurii V. Gabsatarov, and Dmitry A. Alekseev. "Keyboard Model of Seismic Cycle of Great Earthquakes in Subduction Zones: Simulation Results and Further Generalization." Applied Sciences 11, no. 19 (2021): 9350. http://dx.doi.org/10.3390/app11199350.

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Catastrophic megaearthquakes (M > 8) occurring in the subduction zones are among the most devastating hazards on the planet. In this paper we discuss the seismic cycles of the megathrust earthquakes and propose a blockwise geomechanical model explaining certain features of the stress-deformation cycle revealed in recent decades from seismological and satellite geodesy (GNSS) observations. Starting with an overview of the so-called keyboard model of the seismic cycle by L. Lobkovsky, we outline mathematical formalism describing the motion of seismogenic block system assuming viscous rheology

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17

Kong, Xiangkui, Daiqin Liu, Ailixiati Yushan, et al. "Crustal Apparent Density Variations in the Middle Segment of the North Tianshan Mountains and Their Tectonic Significance." Applied Sciences 14, no. 5 (2024): 1694. http://dx.doi.org/10.3390/app14051694.

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In this study, we collected mobile gravity observations in the middle segment of the North Tianshan Mountains from August 2016 to July 2022 and carried out classical adjustment calculations under the constraint of the absolute gravity datum to obtain the spatiotemporal variation pattern of the local gravity field. We used equivalent source inversion to obtain the spatiotemporal variation characteristics of crustal apparent density. We also extracted the coseismic deformation field from SAR data, using the 2016 Hutubi earthquake as an example, and constructed a model of the seismogenic fault. T

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18

Villiger, Linus, Valentin Samuel Gischig, Joseph Doetsch, et al. "Influence of reservoir geology on seismic response during decameter-scale hydraulic stimulations in crystalline rock." Solid Earth 11, no. 2 (2020): 627–55. http://dx.doi.org/10.5194/se-11-627-2020.

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Abstract. We performed a series of 12 hydraulic stimulation experiments in a 20m×20m×20m foliated, crystalline rock volume intersected by two distinct fault sets at the Grimsel Test Site, Switzerland. The goal of these experiments was to improve our understanding of stimulation processes associated with high-pressure fluid injection used for reservoir creation in enhanced or engineered geothermal systems. In the first six experiments, pre-existing fractures were stimulated to induce shear dilation and enhance permeability. Two types of shear zones were targeted for these hydroshearing experime

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Li, Aitang, Chaodi Xie, Yingfeng Ji, et al. "Stress Inversion and Fault Instability in the Source Region of the 2021 (MS 5.0) Yingjiang Earthquake." Applied Sciences 13, no. 2 (2023): 957. http://dx.doi.org/10.3390/app13020957.

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On 12 June 2021, an earthquake with MS 5.0 occurred in Yingjiang, adjacent to eastern Myanmar, where seismic activity is frequent due to plate collision. To explore the mechanism of this earthquake, the regional stress field of the Yingjiang zone was inverted using the focal mechanisms of 187 historical earthquakes in this area. Furthermore, based on the obtained orientation of the principal stress axes and the stress shape ratio, the fault slip tendency (Ts) was also estimated to evaluate fault instability in the study area. The stress variation results show that the diffusion and migration o

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Hashimoto, Yoshitaka, Noriaki Doi, and Takeshi Tsuji. "Difference in acoustic properties at seismogenic fault along a subduction interface: Application to estimation of effective pressure and fluid pressure ratio." Tectonophysics 600 (July 2013): 134–41. http://dx.doi.org/10.1016/j.tecto.2013.03.016.

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Xie, Chaodi, Ye Zhu, Yingfeng Ji, et al. "Coseismic Stress Change and Viscoelastic Relaxation after the 2008 Great Sichuan Earthquake." Applied Sciences 12, no. 19 (2022): 9585. http://dx.doi.org/10.3390/app12199585.

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Long-term stress accumulation influenced by coseismic stress changes and postseismic viscoelastic relaxation is considered critical to triggering giant earthquakes. Nevertheless, how the stress increase is interrupted by aftershocks and how it influences the megaseismic cycle remain enigmatic. In this study, based on the Mohr–Coulomb failure criterion at the nucleated segments of the 2008 great Sichuan earthquake, the stress variation associated with four M > 6 aftershocks was calculated for the period from 2010 to 2017. The results show that (1) the spatial distribution of coseismic stress

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Prando, Francesca, Luca Menegon, Mark Anderson, Barbara Marchesini, Jussi Mattila, and Giulio Viola. "Fluid-mediated, brittle–ductile deformation at seismogenic depth – Part 2: Stress history and fluid pressure variations in a shear zone in a nuclear waste repository (Olkiluoto Island, Finland)." Solid Earth 11, no. 2 (2020): 489–511. http://dx.doi.org/10.5194/se-11-489-2020.

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Abstract. The microstructural record of fault rocks active at the brittle–ductile transition zone (BDTZ) may retain information on the rheological parameters driving the switch in deformation mode and on the role of stress and fluid pressure in controlling different fault slip behaviours. In this study we analysed the deformation microstructures of the strike-slip fault zone BFZ045 in Olkiluoto (SW Finland), located in the site of a deep geological repository for nuclear waste. We combined microstructural analysis, electron backscatter diffraction (EBSD), and mineral chemistry data to reconstr

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23

Lima, A., R. J. Bodnar, B. De Vivo, F. J. Spera, and H. E. Belkin. "Interpretation of Recent Unrest Events (Bradyseism) at Campi Flegrei, Napoli (Italy): Comparison of Models Based on Cyclical Hydrothermal Events versus Shallow Magmatic Intrusive Events." Geofluids 2021 (October 14, 2021): 1–16. http://dx.doi.org/10.1155/2021/2000255.

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Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led to the development of a model based on lithological-structural and stratigraphic features that produce anisotropic and heterogeneous permeability features showing large variations both horizontally and vertically; these data are inconsistent with a model in which bradyseism is driven exclusively by shallow magmatic intrusions. CF bradyseism events are driven by cyclical magmatic-hydrothermal activity. Bra

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Lima, A., R. J. Bodnar, B. De Vivo, F. J. Spera, and H. E. Belkin. "Interpretation of Recent Unrest Events (Bradyseism) at Campi Flegrei, Napoli (Italy): Comparison of Models Based on Cyclical Hydrothermal Events versus Shallow Magmatic Intrusive Events." Geofluids 2021 (October 14, 2021): 1–16. http://dx.doi.org/10.1155/2021/2000255.

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Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led to the development of a model based on lithological-structural and stratigraphic features that produce anisotropic and heterogeneous permeability features showing large variations both horizontally and vertically; these data are inconsistent with a model in which bradyseism is driven exclusively by shallow magmatic intrusions. CF bradyseism events are driven by cyclical magmatic-hydrothermal activity. Bra

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25

Cucci, Luigi, and Francesca R. Cinti. "In Search of the 1654 Seismic Source (Central Italy): An Obscure, Strong, Damaging Earthquake Occurred Less than 100 km from Rome and Naples." Applied Sciences 12, no. 3 (2022): 1150. http://dx.doi.org/10.3390/app12031150.

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The M6.3 earthquake that occurred in southern Lazio (Central Italy) in 1654 is the strongest seismic event to have occurred in the area. However, our knowledge about this earthquake is scarce and no study has been devoted to the individuation of its causative source. The main purpose of this study is putting together all of the information available for this shock to provide reliable landmarks to identify its seismic source. To this end, we present and discuss historical, hydrological, geological, and seismological data, both reviewed and newly acquired. An important, novel part of this study

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Movchan, Igor B., Zilya I. Shaygallyamova, Alexandra A. Yakovleva, and Alexander B. Movchan. "Increasing Resolution of Seismic Hazard Mapping on the Example of the North of Middle Russian Highland." Applied Sciences 11, no. 11 (2021): 5298. http://dx.doi.org/10.3390/app11115298.

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The standard problem of engineering geophysics, solved for road and house building and other construction types, is in the localization of areas with increased mobility in the upper part of a geological cross-section and in the parameterization of this mobility in terms of seismic intensity. There is a standard approach, according to which researchers assess the elastic strength characteristics of the core to a depth of about 30 m, implement the accumulation of seismogram observations, simulate accelerograms for particular conditions and, taking into account the data of complex geophysical met

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Che, Yong-Tai, Wu-Zhou Liu, Jin-Zi Yu, and Ji-Hua Wang. "A hypothesis on seismogenic process in a hard interacalary strata in the crust and promoting earthquakes by fluids for intraplate strong earthquake." Acta Seismologica Sinica 13, no. 1 (2000): 105–14. http://dx.doi.org/10.1007/s11589-000-0088-6.

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28

Zhang, Jianlong, Ye Zhu, Yingfeng Ji, et al. "Earthquake Risk Probability Evaluation for Najin Lhasa in Southern Tibet." Applied Sciences 12, no. 18 (2022): 9394. http://dx.doi.org/10.3390/app12189394.

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The probabilistic seismic hazard analysis (PSHA) method is effectively used in an earthquake risk probability evaluation in seismogenic regions with active faults. In this study, by focusing on the potential seismic source area in Najin Lhasa, southern Tibet, and by incorporating the PSHA method, we determined the seismic activity parameters and discussed the relationship of ground motion attenuation, the seismic hazard probability, and the horizontal bedrock ground motion acceleration peak value under different transcendence probabilities in this area. The calculation results show that the PS

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29

Chen, Xiaolin, Guang Hu, and Xiaoli Liu. "Recognition of Earthquake Surface Ruptures Using Deep Learning." Applied Sciences 12, no. 22 (2022): 11638. http://dx.doi.org/10.3390/app122211638.

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Investigating post-earthquake surface ruptures is important for understanding the tectonics of seismogenic faults. The use of unmanned aerial vehicle (UAV) images to identify post-earthquake surface ruptures has the advantages of low cost, fast data acquisition, and high data processing efficiency. With the rapid development of deep learning in recent years, researchers have begun using it for image crack detection. However, due to the complex background and diverse characteristics of the surface ruptures, it remains challenging to quickly train an effective automatic earthquake surface ruptur

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Li, Jun, Ming Hao, and Zijian Cui. "A High-Resolution Aftershock Catalog for the 2014 Ms 6.5 Ludian (China) Earthquake Using Deep Learning Methods." Applied Sciences 14, no. 5 (2024): 1997. http://dx.doi.org/10.3390/app14051997.

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A high-resolution catalog for the 2014 Ms 6.5 Ludian aftershocks was constructed based on the deep learning phase-picking model (CERP) and seismic-phase association technology (PALM). A specific training strategy, which combines the advantages of the conventional short–long window average energy ratio algorithm (STA/LTA) and AI algorithms, is employed to retrain the CERP model. The P- and S-wave phases were accurately detected and picked on continuous seismic waveforms by the retained AI model. Hypoinverse and HypoDD were utilized for the precise location of 3286 events. Compared to the previo

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Bilau, Antonin, Yann Rolland, Stéphane Schwartz, et al. "Extensional reactivation of the Penninic frontal thrust 3 Myr ago as evidenced by U–Pb dating on calcite in fault zone cataclasite." Solid Earth 12, no. 1 (2021): 237–51. http://dx.doi.org/10.5194/se-12-237-2021.

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Abstract. In the Western Alps, the Penninic frontal thrust (PFT) is the main crustal-scale tectonic structure of the belt. This thrust transported the high-pressure metamorphosed internal units over the non-metamorphosed European margin during the Oligocene (34–29 Ma). Following the propagation of the compression toward the European foreland, the PFT was later reactivated as an extensional detachment associated with the development of the High Durance extensional fault system (HDFS). This inversion of tectonic displacement along a major tectonic structure has been widely emphasized as an examp

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Liu, Dong, Jiancheng Li, Zhe Ni, Yufei Zhao, Qiuyue Zheng, and Bin Du. "Correlation of Gravity and Magnetic Field Changes Preceding Strong Earthquakes in Yunnan Province." Applied Sciences 12, no. 5 (2022): 2658. http://dx.doi.org/10.3390/app12052658.

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The annual variation trend of the gravity and lithospheric magnetic field for adjacent periods are analyzed by using the observation of rover gravity and geomagnetic fields in Yunnan from 2011 to 2021, which tend to be consistent every year during the seismogenic process of a strong earthquake. Thus, this study normalizes the annual value of the adjacent periods for the gravity and lithospheric magnetic field. The normalized values are converted into two classifications that can be compared within [−1,1]. In Yunnan Province, a grid of 0.1° × 0.1° was used to compare the data correlation betwee

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Li, Shuai, Lihua Fang, Zhuowei Xiao, Yijian Zhou, Shirong Liao, and Liping Fan. "FocMech-Flow: Automatic Determination of P-Wave First-Motion Polarity and Focal Mechanism Inversion and Application to the 2021 Yangbi Earthquake Sequence." Applied Sciences 13, no. 4 (2023): 2233. http://dx.doi.org/10.3390/app13042233.

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P-wave first-motion polarity is important for the inversion of earthquake focal mechanism solutions. The focal mechanism solution can further contribute to our understanding of the source rupture process, the fault structure, and the regional stress field characteristics. By using the abundant focal mechanism solutions of small and moderate earthquakes, we can deepen our understanding of fault geometry and the seismogenic environment. In this paper, we propose an automatic workflow, FocMech-Flow (Focal Mechanism-Flow), for identifying P-wave first-motion polarity and focal mechanism inversion

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Jiang, Changsheng, Libo Han, Feng Long, et al. "Spatiotemporal heterogeneity of <i>b</i> values revealed by a data-driven approach for the 17 June 2019 <i>M</i><sub>S</sub> 6.0 Changning earthquake sequence, Sichuan, China." Natural Hazards and Earth System Sciences 21, no. 7 (2021): 2233–44. http://dx.doi.org/10.5194/nhess-21-2233-2021.

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Abstract. The spatiotemporal heterogeneity of b values has great potential for helping in understanding the seismogenic process and assessing seismic hazard. However, there is still much controversy about whether it exists or not, and an important reason is that the choice of subjective parameters has eroded the foundations of much research. To overcome this problem, we used a recently developed non-parametric method based on a data-driven concept to calculate b values. The major steps of this method include (1) performing a large number of Voronoi tessellations and Bayesian information criter

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Angiboust, Samuel, Armel Menant, Taras Gerya, and Onno Oncken. "The rise and demise of deep accretionary wedges: A long-term field and numerical modeling perspective." Geosphere 18, no. 1 (2021): 69–103. http://dx.doi.org/10.1130/ges02392.1.

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Abstract Several decades of field, geophysical, analogue, and numerical modeling investigations have enabled documentation of the wide range of tectonic transport processes in accretionary wedges, which constitute some of the most dynamic plate boundary environments on Earth. Active convergent margins can exhibit basal accretion (via underplating) leading to the formation of variably thick duplex structures or tectonic erosion, the latter known to lead to the consumption of the previously accreted material and eventually the forearc continental crust. We herein review natural examples of activ

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Fan, Longwen, Yingxin Hui, Junlv Liu, and Tianyi Zhou. "Analysis of the Effect of Lateral Collision on the Seismic Response of Bridges under Fault Misalignment." Applied Sciences 13, no. 19 (2023): 10662. http://dx.doi.org/10.3390/app131910662.

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Mutual dislocation of seismogenic faults during strong earthquakes will result in a large relative displacement on both sides of the fault. It is of great significance to explore the influence of the collision effect between the main beam and the transverse shear key on the seismic response of the bridge under fault dislocation. In this paper, a series of cross-fault ground motions with different ground permanent displacements are artificially synthesized using a hybrid simulation method. Based on the contact element theory, the Kelvin–Voigt model is used to simulate the lateral collision effe

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Aptikaeva, O. I. "Weak Seismicity and Strongest Earthquakes Against the Background of the Variations of <i>S</i>-wave Attenuation Field." Физика земли 2023, no. 3 (2023): 96–109. http://dx.doi.org/10.31857/s0002333723030018.

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The paper considers the role of relatively weak earthquakes as a tool for studying the environment, including of strong earthquake process. The spatial structure of the attenuation field of several seismically active regions (of the Garm prognostic polygon in Tajikistan, Altai, the Caucasus, Eastern Anatolia, the Western Tien Shan), as well as the epicentral regions of a number of strong earthquakes, and the confinement of deepened seismicity to it are considered. It is shown that the attenuation field obtained from the short-period code of weak earthquakes in seismically active regions is inh

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Rodríguez-Pascua, Miguel Ángel, Raúl Perez-Lopez, María Ángeles Perucha, et al. "Active Faults, Kinematics, and Seismotectonic Evolution during Tajogaite Eruption 2021 (La Palma, Canary Islands, Spain)." Applied Sciences 14, no. 7 (2024): 2745. http://dx.doi.org/10.3390/app14072745.

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During the 2021 La Palma strombolian and fissure eruption, two faults were identified that controlled the spatial distribution of earthquake hypocenters and effusive eruptive vents. One of these faults has a NW-SE trend (Tazacorte Fault: TZF) and the other one shows an ENE-WSW trend (Mazo Fault: MZF). Previous works on fault structural analysis in La Palma indicated that the eruption zone was compatible with an extensional tectonic strain ellipsoid which activated normal-strike-slip directional faults at the confluence of TZF and MZF. These fractures were activated during the 2021 Tajogaite er

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Molli, Giancarlo, Luca Menegon, and Alessandro Malasoma. "Switching deformation mode and mechanisms during subduction of continental crust: a case study from Alpine Corsica." Solid Earth 8, no. 4 (2017): 767–88. http://dx.doi.org/10.5194/se-8-767-2017.

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Abstract. The switching in deformation mode (from distributed to localized) and mechanisms (viscous versus frictional) represent a relevant issue in the frame of crustal deformation, being also connected with the concept of the brittle–ductile transition and seismogenesis. In a subduction environment, switching in deformation mode and mechanisms and scale of localization may be inferred along the subduction interface, in a transition zone between the highly coupled (seismogenic zone) and decoupled deeper aseismic domain (stable slip). However, the role of brittle precursors in nucleating cryst

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Kamali, Zahra, Hamid Nazari, Ahmad Rashidi, Mahmoud Reza Heyhat, Mohammad Mahdi Khatib, and Reza Derakhshani. "Seismotectonics, Geomorphology and Paleoseismology of the Doroud Fault, a Source of Seismic Hazard in Zagros." Applied Sciences 13, no. 6 (2023): 3747. http://dx.doi.org/10.3390/app13063747.

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In this study, the active tectonics, paleoseismicity, and seismic hazards of the Doroud Fault are examined through high-resolution satellite image interpretations, field investigations, outcrop and trench excavations, and the dating of geochronology samples. The Doroud Fault (DF), one of the essential segments of the Main Recent Fault in the northern margin of the Zagros mountain range, has a historical and instrumental background of high seismicity. We present the first constraints from tectonic geomorphology and paleoseismology along the Doroud Fault near the capital city of Dorud. Detailed

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Fan, Caiyuan, Jinfeng Liu, Luuk B. Hunfeld, and Christopher J. Spiers. "Frictional slip weakening and shear-enhanced crystallinity in simulated coal fault gouges at slow slip rates." Solid Earth 11, no. 4 (2020): 1399–422. http://dx.doi.org/10.5194/se-11-1399-2020.

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Abstract. Previous studies show that organic-rich fault patches may play an important role in promoting unstable fault slip. However, the frictional properties of rock materials with nearly 100 % organic content, e.g., coal, and the controlling microscale mechanisms remain unclear. Here, we report seven velocity stepping (VS) experiments and one slide–hold–slide (SHS) friction experiment performed on simulated fault gouges prepared from bituminous coal collected from the upper Silesian Basin of Poland. These experiments were performed at 25–45 MPa effective normal stress and 100 ∘C, employing

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Shapiro, S. A. "Seismogenic Index of Underground Fluid Injections and Productions." Journal of Geophysical Research: Solid Earth 123, no. 9 (2018): 7983–97. http://dx.doi.org/10.1029/2018jb015850.

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An, Zhen-Wen, Lin-Ying Wang, Yao Chen, and Han-Meng Pan. "Exploring nonlinear characteristics in seismogenic process." Acta Seismologica Sinica 6, no. 4 (1993): 923–30. http://dx.doi.org/10.1007/bf02651827.

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Bruhn, Ronald L., William A. Yonkee, and William T. Parry. "Structural and fluid-chemical properties of seismogenic normal faults." Tectonophysics 175, no. 1-3 (1990): 139–57. http://dx.doi.org/10.1016/0040-1951(90)90135-u.

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Raimbourg, Hugues, Vincent Famin, Giulia Palazzin, et al. "Fluid properties and dynamics along the seismogenic plate interface." Geosphere 14, no. 2 (2018): 469–91. http://dx.doi.org/10.1130/ges01504.1.

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Fleischmann, Karl Henry. "Shallow fluid pressure transients caused by seismogenic normal faults." Geophysical Research Letters 20, no. 20 (1993): 2163–66. http://dx.doi.org/10.1029/93gl02413.

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Johnson, H. Paul, Evan A. Solomon, Robert N. Harris, Marie S. Salmi, and Richard D. Berg. "Heat Flow and Fluid Flux in Cascadia's Seismogenic Zone." Eos, Transactions American Geophysical Union 94, no. 48 (2013): 457–58. http://dx.doi.org/10.1002/2013eo480001.

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Kocharyan, G. G., and I. V. Shatunova. "Topical issues in hydrogeology of seismogenic fault zones." Физика земли, no. 4 (August 19, 2024): 182–211. http://dx.doi.org/10.31857/s0002333724040121.

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The hydrogeology of fault zones, especially at considerable depth, is perhaps the most poorly developed area of earthquake source mechanics. This is due both to the insufficient data on the filtration characteristics of the geomaterial at large depths and to the complexity of the processes of mass transfer, fracture formation and healing under high temperatures and pressures. In these conditions, a fluid obviously has a very strong effect of on both the friction characteristics and the stress state in the vicinity of the slip zone. Fluids are carriers of dissolved matter and thermal energy, an

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Douillet, G. A., B. Taisne, È. Tsang-Hin-Sun, S. K. Müller, U. Kueppers, and D. B. Dingwell. "Syn-eruptive, soft-sediment deformation of deposits from dilute pyroclastic density current: triggers from granular shear, dynamic pore pressure, ballistic impacts and shock waves." Solid Earth 6, no. 2 (2015): 553–72. http://dx.doi.org/10.5194/se-6-553-2015.

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Abstract. Soft-sediment deformation structures can provide valuable information about the conditions of parent flows, the sediment state and the surrounding environment. Here, examples of soft-sediment deformation in deposits of dilute pyroclastic density currents are documented and possible syn-eruptive triggers suggested. Outcrops from six different volcanoes have been compiled in order to provide a broad perspective on the variety of structures: Soufrière Hills (Montserrat), Tungurahua (Ecuador), Ubehebe craters (USA), Laacher See (Germany), and Tower Hill and Purrumbete lakes (both Austral

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Sibson, Richard H. "Dual-Driven Fault Failure in the Lower Seismogenic Zone." Bulletin of the Seismological Society of America 110, no. 2 (2020): 850–62. http://dx.doi.org/10.1785/0120190190.

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ABSTRACT Frictional instability leading to fault rupture may be driven by increasing differential stress or by increases in pore-fluid pressure within the rock mass. Geological evidence (from hydrothermal vein systems in exhumed faults) together with geophysical information around active faults support the localized invasion of near lithostatically overpressured hydrothermal fluids, derived from prograde metamorphism at greater depths, into lower portions of the crustal seismogenic zone at depths of about 10–15 km (250°C&lt;T&lt;350°C). This is especially true of compressional–transpre

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