Article
Geochemistry & Geophysics
Yojiro Yamamoto, Dogan Kalafat, Ali Pinar, Narumi Takahashi, Remzi Polat, Yoshiyuki Kaneda, Haluk Ozener
Summary: The study used ocean bottom seismometer observations to assess the location of possible asperities for future large earthquakes, finding that offshore observations are more accurate and can detect more microearthquakes compared to land-based observations. Results from 2014 to 2017 show that the seismic activity pattern along the North Anatolian Fault beneath the Marmara Sea has remained unchanged.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
S. Baize, S. Amoroso, N. Belic, L. Benedetti, P. Boncio, M. Budic, F. R. Cinti, M. Henriquet, P. Jamsek Rupnik, B. Kordic, S. Markusic, L. Minarelli, D. Pantosti, S. Pucci, M. Spelic, A. Testa, S. Valkaniotis, M. Vukovski, J. Atanackov, J. Barbaca, M. Bavec, R. Brajkovic, V Brcic, M. Caciagli, B. Celarc, R. Civico, P. M. De Martini, R. Filjak, F. Iezzi, A. Moulin, T. Kurecic, M. Metois, R. Nappi, A. Novak, M. Novak, B. Pace, D. Palenik, T. Ricci
Summary: On 29 December 2020, a shallow earthquake of magnitude M-w 6.4 struck northern Croatia, causing significant coseismic environmental effects such as surface deformation, liquefaction, and slope failures. The surface rupture, named the Petrinja-Pokupsko Fault, is discontinuous and shows evidence of slip on a right lateral fault. Liquefaction extends over an area of nearly 600 km(2) around the epicentre. The environmental effects of the earthquake are consistent with the usual scaling relationships.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
G. Rojo Limon, E. Kissling, G. Ouillon, D. Sornette
Summary: The study outlines the process of pairing M4+ earthquakes reported in the routine catalogues of two seismic networks in Turkey. By analyzing data from the Kandilli Observatory and the National Earthquake Department, a total of 1145 paired events were identified and a minimum 1-D velocity model with station delays was established for all seismic stations. The new magnitude frequency distribution is consistent with those of AFAD and KOERI for M4+ events, with an epicentre uncertainty of 3 km and a depth uncertainty of 4 km.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Farnaz Bayat, Milad Kowsari, Benedikt Halldorsson
Summary: This study proposes a new 3-D finite-fault model of the Southwest Iceland bookshelf transform zone. The model is calibrated on the basis of first principles and constrained by the salient features of the fault system geometry. By subdividing the seismogenic potential along the zone into six distinct zones, the model provides a comprehensive assessment of seismic risk.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Rong Zhao, Jing Xue, Kai Deng
Summary: Abnormal seismic activities near reservoirs are strongly correlated with the water filling history. These seismic activities are caused by changes in crustal pore pressure and stress due to water impounded behind the dams. This study presents a numerical investigation of the seismicity rate evolution of reservoir-induced earthquakes using a fully coupled 2-D poroelastic model. The results show that shallow earthquakes are mainly caused by pore pressure increase, while poroelastic stress transfer dominates at depth. The temporal evolution of reservoir-induced earthquakes is primarily controlled by tectonic environment.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Thystere Matondo Bantidi
Summary: Earthquake hazard assessment is the first step towards reducing the risk of seismic disasters. This study provides a comprehensive analysis of present-day seismicity in Africa and investigates the impact of previous earthquakes on the probability of future events. The results suggest a high likelihood of future earthquakes in the study region, and highlight the importance of considering uncertainties in the assessment of conditional probabilities.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Onur Tan, Ozlem Karagoz, Semih Ergintav, Kemal Duran
Summary: This study focuses on the recent and future potential impacts of earthquakes in Istanbul, Turkey. By relocating 386 earthquakes from 2006 to 2016 and investigating two moderate earthquakes in 1923 and 1929, the study reveals the effects of these earthquakes on the region and the stress regime. Using numerical ground motion simulations, it is found that a moderate event (M-w 5) in Istanbul can potentially cause damage to mid-rise buildings due to resonance phenomena and poor construction quality.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Aisling O'Kane, Alex Copley
Summary: Rapid urban growth has increased population density in foreland basins, leading to higher earthquake risk. Seismic wave propagation in these areas is mainly controlled by source depth and basin structure. Matching basin depth with dominant wavelength results in maximum ground motion.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Min Wang, Fan Wang, Xin Jiang, Jianbo Tian, Yu Li, Jiaobao Sun, Zheng-Kang Shen
Summary: This study discusses the characteristics and potential earthquake risks associated with the M(w)7.4 Maduo earthquake that occurred in the eastern Tibetan region in 2021.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Xiaodong Yang, Qiang Qiu, Wanpeng Feng, Jian Lin, Jinchang Zhang, Zhiyuan Zhou, Fan Zhang
Summary: The Makran subduction zone is an active area with uncertain earthquake and tsunami characteristics. By studying the characteristics of a recent earthquake in 2017, we have identified some key features and suggested the possibility of future earthquakes.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Hongli Li, You Tian, Dapeng Zhao, Dong Yan
Summary: In this study, detailed 3-D velocity images and velocity azimuthal anisotropy in source areas of 26 large crustal earthquakes in North China from 1966 to 2021 are presented. Most of the earthquakes occurred in high-velocity zones or near the boundary between low-velocity and high-velocity anomalies. Prominent low-velocity and high Poisson's ratio anomalies are observed in the middle and lower crust, indicating the presence of crustal fluids.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Eutizio Vittori, Anna Maria Blumetti, Valerio Comerci, Pio Di Manna, Luigi Piccardi, Dashamir Gega, Ismail Hoxha
Summary: The earthquake that occurred on November 26, 2019 was the strongest in Albania in recent decades, causing damage with a intensity of VIII to IX EMS around Durres. The main environmental effects included uplift and liquefaction, with the rupture parameters indicating a reverse slip on a NW-SE trending plane. Historical earthquakes and the regional tectonic setting suggest that the last earthquake may not represent the actual maximum seismic and surface faulting hazards in northwestern Albania, calling for further detailed studies in the area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
M. Laporte, L. Bollinger, H. Lyon-Caen, R. Hoste-Colomer, C. Duverger, J. Letort, M. Riesner, B. P. Koirala, M. Bhattarai, T. Kandel, C. Timsina, L. B. Adhikari
Summary: The study focuses on seismic tectonics in the Himalayan range, revealing the close relationship between mid-crustal seismic activity and the geometry of the Main Himalayan Thrust system. The seismic activity is influenced by deep fault behavior, fluids, and may control the rupture extension of different earthquakes, providing insights into the distribution and nature of seismic activity.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Edwin Nissen, Musavver Didem Cambaz, Elyse Gaudreau, Andrew Howell, Ezgi Karasozen, Elena Savidge
Summary: This study investigates the active tectonics in southwestern Turkey and reveals the dominant normal faulting orientation in the region. It also highlights the discrepancy between fault orientations in topography and actual faulting activity. The research provides valuable insights into the earthquake hazards in the area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Ping He, Yangmao Wen, Shuiping Li, Kaihua Ding, Zhicai Li, Caijun Xu
Summary: The Tien Shan is the largest and most active intracontinental orogenic belt on Earth, providing a natural laboratory for understanding Cenozoic orogenic processes driven by the India-Asia collision. A Mw 6.1 earthquake that struck the Kalpin region on January 19, 2020 has highlighted the ongoing orogenic processes and potential seismic hazard in the area. Analysis of geodetic observations has revealed a nearly subhorizontal decollement plane in the region, indicating a risk of frequent moderate earthquakes in the future.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Federica Lanza, Tobias Diehl, Nicholas Deichmann, Toni Kraft, Christophe Nussbaum, Senecio Schefer, Stefan Wiemer
Summary: The interpretation of seismotectonic processes in the uppermost layers of the Earth's crust is challenging due to uncertainties in hypocenter locations and focal mechanisms of shallow seismicity. A study on the Saint-Ursanne seismic sequence in 2000 suggests that it is likely related to a backthrust fault within the sedimentary cover. These findings shed new light on the seismotectonic processes of the Jura fold-and-thrust belt in northern Switzerland.
SWISS JOURNAL OF GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Jannes Munchmeyer, Jack Woollam, Andreas Rietbrock, Frederik Tilmann, Dietrich Lange, Thomas Bornstein, Tobias Diehl, Carlo Giunchi, Florian Haslinger, Dario Jozinovic, Alberto Michelini, Joachim Saul, Hugo Soto
Summary: Deep learning models, such as EQTransformer, GPD, and PhaseNet, have shown the best performance in seismic event detection and phase picking. The study also reveals that models can be effectively transferred across regions with similar distances. The results and trained models are made accessible to end-users through the SeisBench framework for easy application.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Peidong Shi, Francesco Grigoli, Federica Lanza, Gregory C. Beroza, Luca Scarabello, Stefan Wiemer
Summary: Robust automatic event detection and location is crucial for real-time earthquake monitoring. ML-based classical workflows face challenges when analyzing microseismic data. To leverage the advantages of both full waveform methods and ML techniques, a new workflow called MALMI is proposed, which integrates ML and waveform migration for automated event detection and location.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Jack Woollam, Jannes Muenchmeyer, Frederik Tilmann, Andreas Rietbrock, Dietrich Lange, Thomas Bornstein, Tobias Diehl, Carlo Giunchi, Florian Haslinger, Dario Jozinovi, Alberto Michelini, Joachim Saul, Hugo Soto
Summary: Machine-learning methods have been widely used in seismology, but the current process of accessing benchmark datasets and models is time-consuming, which hinders the further development of machine learning techniques. To address this issue, we introduce SeisBench, an open-source framework that standardizes access to models and datasets and provides common processing and data augmentation operations. With SeisBench, seismologists can easily access various machine learning models and benchmark datasets.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Francesco Grigoli, John F. Clinton, Tobias Diehl, Philipp Kaestli, Luca Scarabello, Thorbjorg Agustsdottir, Sigridur Kristjansdottir, Rognvaldur Magnusson, Christopher J. Bean, Marco Broccardo, Simone Cesca, Torsten Dahm, Vala Hjorleifsdottir, Banu Mena Cabrera, Claus Milkereit, Nima Nooshiri, Anne Obermann, Roman Racine, Antonio Pio Rinaldi, Vanille Ritz, Pilar Sanchez-Pastor, Stefan Wiemer
Summary: Induced seismicity is a major factor affecting the acceptance of deep geothermal energy exploitation activities, and this paper presents a valuable dataset obtained from a project aimed at real-time monitoring and forecasting of induced seismicity, which can be widely used in seismological research.
Article
Geochemistry & Geophysics
M. Bagagli, I Molinari, T. Diehl, E. Kissling, D. Giardini
Summary: With the use of the AlpArray Seismic Network, a consistent seismicity-catalogue for the greater Alpine region has been established, providing high-precision hypocentre locations and consistent magnitude estimation. These findings serve as a foundation for future seismic hazard studies and improvements in the region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Leila Mizrahi, Shyam Nandan, William Savran, Stefan Wiemer, Yehuda Ben-Zion
Summary: This paper proposes a question-driven ensemble (QDE) modeling approach to address the goals of gaining new insights into earthquake physics and producing improved forecasts. Through pseudoprospective forecasting experiments in southern California and Italy, it is found that certain QDE models outperform standard ETAS and ingredient models, effectively addressing the issues in both regions.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Tobias Diehl, Herfried Madritsch, Michael Schnellmann, Thomas Spillmann, Elmar Brockmann, Stefan Wiemer
Summary: This study presents a seismotectonic analysis of the Miocene-aged Hegau-Bodensee Graben, revealing the seismic activity and kinematics of the bounding faults. The results suggest that the bounding faults are likely to be reactivated in the present-day stress field. Comparison with historical seismicity indicates the potential for generating moderate earthquakes in this fault zone.
Article
Geosciences, Multidisciplinary
Anne Obermann, Sin-Mei Wu, Thorbjorg Agustsdottir, Alejandro Duran, Tobias Diehl, Pilar Sanchez-Pastor, Sigridur Kristjansdottir, Vala Hjorleifsdottir, Stefan Wiemer, Gylfi Pall Hersir
Summary: In this study, we investigate the shallow crustal structures and seismicity patterns in the Hengill high-enthalpy geothermal area in SW Iceland. Our results show that seismicity in the area is clustered and associated with injection and production activities. Furthermore, we analyze the spatial distribution of rock properties and geophysical anomalies.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Sandro Truttmann, Tobias Diehl, Marco Herwegh
Summary: This study presents a novel method for imaging the detailed 3D architectures of seismically active faults based on high-precision hypocenter catalogs using nearest neighbor learning and principal component analysis. The method was applied to the St. Leonard and Anzere microearthquake sequences in the Southwestern Swiss Alps, revealing strike-slip fault systems with interconnecting stepovers at depths of 3-7 km and lengths ranging from 0.5 to 2 km. The proposed method has broad potential applications in monitoring hydraulic fracture stimulations or geothermal exploration of natural, fluid-bearing faults.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Luca Dal Zilio, Domenico Giardini, Ramon Carbonell, Stefan Wiemer
Summary: Digital twins, as virtual replicas of natural systems, are promising tools for assessing seismic hazard, aiding disaster decision-making, and earthquake rapid response. However, the challenges of exascale computing need to be tackled to create adaptable systems capable of meeting evolving earthquake dynamics.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Vanille A. Ritz, Antonio P. Rinaldi, Stefan Wiemer
Summary: This article investigates the hazards caused by induced earthquakes in enhanced geothermal systems and reveals the importance of the relative size distribution of earthquakes, or the b-value, in controlling seismic risks. By comparing field observations and model results, the study demonstrates the systematic evolution of the b-value and resulting hazard during the injection cycle, which is influenced by site conditions, proximity to faults, and injection strategy. The findings provide new insights for assessing and mitigating seismic hazards and risks in geothermal projects.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)