S038-0008
Environmental Triggering of Seismicity in California

Friday, 11 December 2020
Poster
Bruce Zhou, University of Southern California, Los Angeles, CA, United States, Ilya V Zaliapin, University of Nevada, Reno, Reno, NV, United States, Christopher W Johnson, Los Alamos National Laboratory, Los Alamos, NM, United States, Yuning Fu, Jet Propulsion Laboratory, Pasadena, CA, United States; Bowling Green State University, School of Earth, Environment and Society, Bowling Green, OH, United States, Kristel Chanard, California Institute of Technology, Pasadena, United States; Université de Paris, Institut de Physique du Globe de Paris (IPGP), UMR 7154, Paris, France and Yehuda Ben-Zion, University of Southern California, Department of Earth Sciences and Southern California Earthquake Center, Los Angeles, CA, United States
Abstract:
Exploring the potential triggering of earthquakes by environmental forcing terms, such as water mass loading and surface temperature changes, contributes to the understanding of crustal mechanics and dynamics of seismicity. The various geological and geomorphic settings in California provide the opportunity to perform a comparative study of nontectonic modulation of seismicity under different conditions. Here we use 14 years of water storage changes estimated from global positioning system (GPS) vertical elastic loading deformation time series, water levels in aquifers, and a declustered version of the ANSS Comprehensive Earthquake Catalog (ComCat) to analyze correlations between background seismicity rate variations and different possible forcing terms in various sub regions in California. Preliminary results show a variety of correlations that suggest different possible dominant forcing terms in different locations. Significant detected correlations will be modeled with poroelastic and thermoelastic frameworks.
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