S009
Fault Zone Complexity and Earthquake Rupture Dynamics: From Nucleation to Arrest
Session ID#: 251196
Session Description:
Tectonic fault zones are inherently complex systems, rarely conforming to simplistic or homogenous structural models. They are characterized by localized-to-distributed zones of brittle-to-ductile deformation accommodated across architecturally complex shear zones, fault cores, and slip surfaces with variable frictional, rheological and material properties. Such complexities and heterogeneities play a fundamental role in controlling the full spectrum of earthquake rupture processes, including nucleation, propagation, arrest and post-seismic deformation, including afterslip. This session will showcase recent interdisciplinary advances that enhanced our understanding on how fault zone complexity influences earthquake rupture dynamics. We welcome contributions covering a broad range of approaches, including geodetic measurements of fault creep and slow-slip, in-situ field experiments, and seismic field observations. Submissions employing laboratory experiments, theoretical analyses and numerical modeling are encouraged. By bringing together diverse methodologies and perspectives, this session seeks to advance our understanding of the mechanisms governing earthquake initiation and rupture evolution in complex fault zones.
Co-Sponsor(s):
Index Terms:
1207 Transient deformation [GEODESY AND GRAVITY]
7209 Earthquake dynamics [SEISMOLOGY]
7223 Earthquake interaction, forecasting, and prediction [SEISMOLOGY]
7230 Seismicity and tectonics [SEISMOLOGY]
Primary Convener: Patricia Martínez-Garzón, RWTH Aachen University, Aachen, Germany
Conveners: Chas Bolton, University of Texas at Austin, University of Texas Institute for Geophysics, Austin, United States, Camilla Cattania, Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany and Evan Marschall, University of California Riverside, Riverside, United States
Student/Early Career Convener: Evan Marschall, University of California Riverside, Riverside, United States
Strong Ground Motions from Large Earthquakes on the creeping Hayward, Rodgers Creek, and Calaveras Faults, California (1863121)
Ruth Harris1, Michael Barall2, Grace Alexandra Parker1, Evan Hirakawa1 and Michael Barall, USGS, Earthquake Science Center, (1)U.S. Geological Survey, Earthquake Science Center, Moffett Field, United States, (2)US Geological Survey, Earthquake Science Center, Moffett Field, United States
Effects of Plate Interface Roughness and Frictional Heterogeneities on Earthquake Cycle Dynamics in Subduction Zones (1867621)
Sayak Ray1, Abhijit Ghosh2, Bhaskar Kundu1 and Batakrushna Senapati3, (1)National Institute of Technology Rourkela, Earth and Atmospheric Sciences, Rourkela, India, (2)University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, (3)NCU National Central University of Taiwan, Department of Earth Science, Jhongli, Taiwan
Bridging the Gap Between Millions of Years and Milliseconds: Modeling Earthquake Sequences, Slow Slip, and Splay Fault Rupture in Subduction Zones (1878334)
Alexander Koelzer1, Mhina de Vos1, Taras Gerya2 and Ylona van Dinther1, (1)Utrecht University, Department of Earth Sciences, Utrecht, Netherlands, (2)ETH Zurich, Department of Earth and Planetary Sciences, Zurich, Switzerland
Unraveling the run-up to the 2023 MW 7.8 Kahramanmaraş earthquake in Türkiye: Insights from a high-resolution microseismicity catalog (1890832)
Sebastian Nunez1, Patricia Martínez-Garzón1, Francesco Scotto Di Uccio2, Georg Dresen1, Grzegorz Kwiatek3, Yehuda Ben-Zion4, Dirk Becker5, Dino Bindi1, Fabrice Cotton1 and Marco Bohnhoff1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)University of Naples Federico II, Department of Physics, Naples, Italy, (3)GMuG Gesellschaft für Materialprüfung und Geophysik mbH, Bad Nauheim, Germany, (4)University of Southern California, Department of Earth Sciences and Statewide California Earthquake Center, Los Angeles, United States, (5)University of Hamburg, Hamburg, Germany
Tidally triggered seismicity along the Quebrada-Discovery-Gofar oceanic transform fault system (1897083)
Vaibhav Vijay Ingale1, Ross E Parnell-Turner1 and Wenyuan Fan2, (1)Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States, (2)Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States
Can the Complex Dynamic Rupture Behaviour of the 2025 Myanmar Earthquake be Predicted from its Static Slip Distribution Alone? (1901606)
Alice-Agnes Gabriel1, Thomas Ulrich2, Xiaoyu Zou3, Nico Schliwa4, Mathilde Marchandon5, Fengzhou Tan6, Wenyuan Fan1, Peter M Shearer7 and Yuri A Fialko3, (1)Scripps Institution of Oceanography, La Jolla, United States, (2)Ludwig-Maximilians-Universität München, Department of Earth and Environmental Sciences, Munich, Germany, (3)Scripps Institution of Oceanography, University of California, San Diego, Institute of Geophysics and Planetary Physics, La Jolla, United States, (4)Ludwig Maximilians University of Munich, Munich, Germany, (5)Université Côte d’Azur, CNRS, OCA, IRD, Géoazur, Valbonne, France, (6)Geological Survey of Canada Sidney, Sidney, BC, Canada, (7)Univ California San Diego, La Jolla, United States
Geodetic Evidence of Granular Fault-zone Deformation in the 2025 Mw7.7 Myanmar Earthquake (1909903)
Dezheng Zhao1, Huihui Weng2, Xiaoping Jia3, Xin Qiao4 and Qin Wang1, (1)Nanjing University, School of Earth Sciences and Engineering, Nanjing, China, (2)Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Valbonne, France, (3)Université Paris Sciences & Lettres, CNRS, Institut Langevin, École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, Paris, France, (4)China University of Mining and Technology, School of Environment Science and Spatial Informatics, Xuzhou, China
Direct Estimation of Earthquake Source Properties from a Single CCTV Camera (Invited) (1916369)
Francois Passelegue, Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, Valbonne, France, Mathias Lebihain, École Nationale des Ponts et Chaussées, Laboratoire Navier, Paris, France, Harsha Bhat, Ecole Normale Supérieure, PSL, CNRS UMR 8538, Laboratoire de Géologie, Paris, France, Quentin Bletery, Université Côte d'Azur, CNRS, OCA, IRD, Géoazur, Valbonne, France, Kenneth Hudnut, Southern California Edison, Los Angeles, United States, Soumaya Latour, IRAP, Toulouse, France, Cedric Twardzik, Géoazur - Université Nice Sophia Antipolis, Valbonne, France and Soumaya Latour
The influence of pre-existing fault structure and stress heterogeneity on rupture complexity: from strike-slip to subduction systems (Invited) (1927378)
Zhe Jia1, Wangwang Gu2, Dunyu Liu3, Hongbo Han4, Jingyi Chen5, Risheng Chu2, Sidao Ni2, Yu Jiang6, Alice-Agnes Gabriel7 and Wenyuan Fan8, (1)University of Texas at Austin, UT Institute for Geophysics, Austin, United States, (2)Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China, (3)University of Texas at Austin, Institute for Geophysics, Austin, United States, (4)USTC University of Science and Technology of China, Hefei, China, (5)The University of Texas at Austin, Aerospace Engineering & Engineering Mechanics, Austin, United States, (6)University of Nevada Reno, Reno, United States, (7)Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States, (8)Scripps Institution of Oceanography, La Jolla, United States
The complex rupture dynamics of an oceanic transform fault: supershear rupture and deep slip during the 2024 Mw7.0 Cape Mendocino Earthquake (1931424)
Yohai Magen1, Thomas Ulrich2 and Alice-Agnes Gabriel2,3, (1)Scripps Institution of Oceanography, University of California San Diego, La Jolla, United States, (2)Ludwig-Maximilians-Universität München, Department of Earth and Environmental Sciences, Munich, Germany, (3)University of California San Diego, Scripps Institution of Oceanography, La Jolla, United States
Rupture dynamics of fluid-induced microearthquakes controlled by 3D fault roughness (1941833)
Francesco Mosconi1, Elisa Tinti1, Alice-Agnes Gabriel2, Thomas Ulrich2, Emanuele Casarotti3, Antonio Pio Rinaldi4 and Massimo Cocco5, (1)Sapienza University of Rome, Rome, Italy, (2)Ludwig-Maximilians-Universität München, Department of Earth and Environmental Sciences, Munich, Germany, (3)National Institute of Geophysics and Volcanology, Rome, Italy, (4)Swiss Federal Institute of Technology (ETH), Zurich, Switzerland, (5)Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Transient Slip Rates as a Key Control on Laboratory- and Natural-Earthquake Nucleation (1946354)
Barnaby Fryer, Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Valbonne, France, Dmitry Garagash, Dalhousie University, Department of Civil and Resource Engineering, Halifax, NS, Canada, Mathias Lebihain, École Nationale des Ponts et Chaussées, Laboratoire Navier, Paris, France and Francois Passelegue, Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Anisotropic kilometer-scale structures facilitate earthquakes on the subduction zone plate interface (1949062)
Yihe Huang, University of Michigan Ann Arbor, Department of Earth and Environmental Sciences, Ann Arbor, United States, Satoshi Ide, The University of Tokyo, Department of Earth and Planetary Science, Bunkyo-ku, Japan, Aitaro Kato, University of Tokyo, Bunkyo-ku, Japan, Keisuke Yoshida, Tohoku University, Graduate School of Science, Sendai, Japan, Chengxin Jiang, Australian National University, Canberra, ACT, Australia and Peng Zhai, Earth and Environmental Sciences Department, University of Michigan, Ann Arbor, United States
The Generation of Large and Small Earthquakes due to Weak Fault Zone Deformation (1953153)
Peng Zhai, University of Michigan Ann Arbor, Ann Arbor, MI, United States, Yihe Huang, Earth and Environmental Sciences Department, University of Michigan, Ann Arbor, United States and Jean-Paul Ampuero, Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Valbonne, France
The influence of inelastic yielding on dynamic rupture termination and ground deformation at fault bends (1956569)
Evan Marschall1,2, Roby Douilly2 and Alice-Agnes Gabriel3, (1)Scripps Institution of Oceanography, La Jolla, United States, (2)University of California Riverside, Riverside, United States, (3)University of California San Diego, Scripps Institution of Oceanography, La Jolla, United States
Mechanisms of dynamic Segmentation along the Sagaing fault (1962076)
Mingqi Liu1, Binhao Wang1, Sezim Guvercin2, Zhen Li3, Teng Wang4, Chuanjin Liu5, Lingyun Ji5 and Sylvain Barbot1, (1)University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, (2)University of Southern California, Los Angeles, CA, United States, (3)Peking University, ITAG Institute of Theoretical and Applied Geophysics, Beijing, China, (4)School of Earth and Space Sciences, Peking University, Beijing, China, (5)China Earthquake Administration, The Second Monitoring and Application Center, Xi'an, China
The Effects of Bulk Friction and Cohesion in 2D Dynamic Models of the 1971 San Fernando Earthquake (1962281)
Guadalupe Bravo1, David Douglas Oglesby2, Élyse Gaudreau3, Gareth Funning4, Edwin Nissen3 and James Hollingsworth5, (1)University of California Riverside, Riverside, CA, United States, (2)University of California, Riverside, Department of Earth and Planetary Sciences, Riverside, United States, (3)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada, (4)University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, (5)Université Grenoble Alpes, ISTerre, Saint Martin d'Hères, France
Dynamic models of branching faults and surface rupture in the Signal Hill Stepover on the Newport-Inglewood Fault, Southern California (1971074)
David Douglas Oglesby1, Natasha Toghramadjian2, Andreas Plesch3, John H Shaw3 and Wenqiang Zhang4, (1)University of California Riverside, Department of Earth and Planetary Sciences, Riverside, United States, (2)Harvard University, Earth and Planetary Sciences, Cambridge, United States, (3)Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, (4)Stanford University, Department of Geophysics, Stanford, United States
