S011
How Do Earthquakes Start?
Session ID#: 159780
Session Description:
While a number of physical processes and properties, such as fault frictional/structural heterogeneity, the presence of fluids, thermal effects, aseismic deformation, as well as static and dynamic stress changes, have been proposed to play a role in the nucleation and triggering of earthquakes, their relative significance and relevant spatial and temporal scales remain uncertain. We welcome experimental, theoretical and observational studies that explore and document the conditions of ruptures initiation, including but not limited to the following questions: (1) What are signatures of earthquake nucleation? (2) To what degree and at what spatio-temporal scales does heterogeneity impact nucleation? (3) Under what conditions do fluids induce unstable slip? (4) What role do static/dynamic stress changes play in promoting seismicity? (5) What is the relationship between aseismic deformation and earthquake nucleation? (6) Why do some ruptures accelerate and become large dynamic events while others remain small or aseismic?
Index Terms:
1242 Seismic cycle related deformations [GEODESY AND GRAVITY]
7209 Earthquake dynamics [SEISMOLOGY]
7230 Seismicity and tectonics [SEISMOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
Primary Convener: Kelian Dascher-Cousineau, University of California Santa Cruz, Santa Cruz, CA, United States and Daniel trugman
Conveners: Valere Lambert, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Daniel T Trugman, Los Alamos National Laboratory, Los Alamos, United States, Alexis L Cartwright-Taylor, University College London, London, United Kingdom and Daniel trugman
Earthquake Nucleation on Reactivated Faults with Velocity-Strengthening Friction (1081088)
Meng Li1, Andre Niemeijer2, Femke C Vossepoel3 and Ylona van Dinther1, (1)Utrecht University, Department of Earth Sciences, Utrecht, Netherlands, (2)Utrecht University, Utrecht, Netherlands, (3)Delft University of Technology, Geoscience and Engineering, Delft, Netherlands
Hypocenter depth variation on a vertical strike-slip fault in a damage zone governed by rate and state friction (1085676)
Deng Shuai1, Chao Liang1, Jean-Paul Ampuero2 and Kaoshan Dai1, (1)Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, China, (2)Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Géoazur, Seismology, Valbonne, France
Sea level changes can trigger earthquake sequences in a hydrothermal system near Istanbul (1092720)
Patricia Martínez-Garzón1, Gregory C Beroza2, Gian Maria Bocchini3 and Marco Bohnhoff1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Stanford University, Department of Geophysics, Stanford, CA, United States, (3)Ruhr-Universitat Bochum, Institute of Geology, Mineralogy and Geophysics, Bochum, Germany
Coupled Interaction between Fluid Pressure Perturbation, Aseismic slip, and Seismic Rupture in Injection-Induced Earthquakes (1110063)
SeongJu Jeong, University of Toronto, Earth Sciences, Toronto, ON, Canada, Xinyu Tan, University of Toronto Mississauga, Chemical and Physical Sciences, Mississauga, ON, Canada and Semechah K. Y. Lui, Caltech, Pasadena, CA, United States
A struggled initiation of the Mw 6.1 2009 L’Aquila earthquake (1110602)
Piero Poli, CNRS, Université Grenoble Alpes, Institut des Sciences de la Terre (ISTerre), St Martin D'Hères, France and Leoncio Cabrera, Université Grenoble Alpes, CNRS, Institut des Sciences de la Terre (ISTerre), St Martin D'Hères, France
DAS Signatures of Aseismic Slip During Hydraulic Fracturing: Field Observations and Modeling (1113729)
Chaoyi Wang1, Chaoyi Wang2, Yuanyuan MA2, Rebecca Olivia Salvage2 and David W S Eaton2, (1)Pennsylvania State University Main Campus, University Park, PA, United States, (2)University of Calgary, Geoscience, Calgary, AB, Canada
What prevented the Instantaneous Dynamic Triggering of the 2019 Mw 7.1 Ridgecrest Mainshock by the Mw 5.4 Foreshock? (1122767)
Jeena Yun1, Yuri A Fialko1 and Alice-Agnes Gabriel2, (1)Scripps Institution of Oceanography, University of California, San Diego, Institute of Geophysics and Planetary Physics, La Jolla, United States, (2)Ludwig-Maximilians-Universität, Earth and Environmental Sciences, Munich, Germany
The 2020 Westmorland, California earthquake swarm as aftershocks of a slow slip event sustained by fluid flow (1139083)
Krittanon Sirorattanakul, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Zachary E. Ross, California Institute of Technology, Seismological Laboratory, Pasadena, United States, Mostafa Khoshmanesh, Arizona State University, Tempe, AZ, United States, Elizabeth S Cochran, U.S. Geological Survey, Earthquake Science Center, Pasadena, United States, Mateo Acosta, Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland and Jean-Philippe Avouac, California Institute of Technology, Geological and Planetary Sciences, Pasadena, CA, United States
Data-Driven Identification of Governing Equations for Aseismic Fault Slip and Frictional Heterogeneities (1150820)
Pulak Biswas, Indian Institute of Technology Roorkee, Earthquake Engineering, Roorkee, India and Sohom Ray, Indian Institute of Technology Roorkee, Earthquake Engineering, Mehta Family School of DS & AI, IIT Roorkee, Roorkee, India
Influence of viscous fluids in the nucleation of spontaneous frictional ruptures. (1166268)
Federica Paglialunga1, Francois Passelegue2, Mathias Lebihain3, Alisson Gounon4, Soumaya Latour4 and Marie Violay1, (1)Swiss Federal Institute of Technology Lausanne, LEMR, Lausanne, Switzerland, (2)Géoazur, Université de Côte d'Azur, Nice, France, (3)École Nationale des Ponts et Chaussées, Laboratoire Navier, Paris, France, (4)IRAP, Toulouse, France
Duration and dynamic stress drop during the initial rupture “breakaway” stage of crustal earthquakes (1178959)
Chen Ji, University of California Santa Barbara, Santa Barbara, CA, United States, Ralph J Archuleta, Univ California Santa Barbara, Santa Barbara, CA, United States, Brin Bailey, University of California Santa Barbara, Santa Barbara, United States and Aaron Peyton, university of California Santa Barbara, Department of Earth Science, Santa Barbara, United States
Fault roughness’s influence on experimental fault mechanical behavior (1182044)
Barnaby Fryer, EPFL Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland, Carolina Giorgetti, EPFL Swiss Federal Institute of Technology Lausanne, ENAC IIC LEMR, Lausanne, Switzerland, Francois Passelegue, Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland, Seyyedmaalek Momeni, École polytechnique fédérale de Lausanne (EPFL), Institute of Civil Engineering, Gaznat chair on Geo-Energy, Lausanne, Switzerland, Brice T Lecampion, École Polytechnique Fédérale de Lausanne (EPFL), Institute of Civil Engineering, Gaznat chair on Geo-Energy, Lausanne, Switzerland and Marie Violay, Swiss Federal Institute of Technology Lausanne, LEMR, Lausanne, Switzerland
The Tidal Stress Triggering of Microearthquakes in the Decade Preceding the 2019 M7.1 Ridgecrest Earthquake (1183213)
Eric Beauce, Lamont–Doherty Earth Observatory, Columbia University, New York City, United States, Piero Poli, CNRS, Université Grenoble Alpes, Institut des Sciences de la Terre (ISTerre), St Martin D'Hères, France, Benjamin K Holtzman, Lamont Doherty Earth Observatory, Columbia Univ., Palisades, NY, United States and Felix Waldhauser, Columbia University, Lamont-Doherty Earth Observatory, Palisades, United States
What can Glacier Beds tell us about Earthquake Nucleation? (1188271)
Dominik Gräff1,2, Fabian Walter3 and Bradley Paul Lipovsky2, (1)ETH Zurich, Laboratory of Hydraulics, Hydrology and Glaciology (VAW), Zurich, Switzerland, (2)University of Washington, Department of Earth and Space Sciences, Seattle, United States, (3)WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland
Mechanism of Dynamic Triggering for Slab-related Fluid-induced Tremors Occurred in Nanao, Taiwan (1198081)
Yi-Hsuan Wu1, Wu-Cheng Chi1, Liam Chai2 and Chin-Jen Lin1, (1)Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan, (2)Taipei American School, Taipei, Taiwan
