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DOI10.1029/2020JB020820
Characteristics of Frequent Dynamic Triggering of Microearthquakes in Southern California
Fan W.; Barbour A.J.; Cochran E.S.; Lin G.
发表日期2021
ISSN21699313
卷号126期号:1
英文摘要Dynamic triggering of earthquakes has been reported at various fault systems. The triggered earthquakes are thought to be caused either directly by dynamic stress changes due to the passing seismic waves, or indirectly by other nonlinear processes that are initiated by the passing waves. Distinguishing these physical mechanisms is difficult because of the general lack of high-resolution earthquake catalogs and robust means to quantitatively evaluate triggering responses, particularly, delayed responses. Here we use the high-resolution Quake Template Matching catalog in Southern California to systematically evaluate teleseismic dynamic triggering patterns in the San Jacinto Fault Zone and the Salton Sea Geothermal Field from 2008 to 2017. We develop a new statistical approach to identify triggered cases, finding that approximately 1 out of every 5 global Mw ≥ 6 earthquakes dynamically trigger microearthquakes in Southern California. The triggering responses include both instantaneous and delayed triggering, showing a highly heterogeneous pattern and indicating possible evolving triggering thresholds. We do not observe a clear peak ground velocity triggering threshold that can differentiate triggering earthquakes from nontriggering events, but there are subtle differences in the frequency content of the ground motion that may differentiate the earthquakes. In contrast to the depth distribution of background seismicity, the identified triggered earthquakes tend to concentrate at the edges of the seismogenic zones. Although instantaneously triggered earthquakes are likely a result of dynamic Coulomb stress changes, the cases of delayed-dynamic triggering are best explained by nonlinear triggering processes, including cyclic material fatigue, accelerated transient creep, and stochastic frictional heterogeneities. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词dynamic triggering; earthquakes; Salton Sea Geothermal Field; San Jacinto Fault Zone; Southern California
语种英语
来源期刊Journal of Geophysical Research: Solid Earth
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/187420
作者单位Scripps Institution of Oceanography, U.C. San Diego, La Jolla, CA, United States; Earthquake Science Center, U.S. Geological Survey, Moffett Field, CA, United States; Earthquake Science Center, U.S. Geological Survey, Pasadena, CA, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
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Fan W.,Barbour A.J.,Cochran E.S.,et al. Characteristics of Frequent Dynamic Triggering of Microearthquakes in Southern California[J],2021,126(1).
APA Fan W.,Barbour A.J.,Cochran E.S.,&Lin G..(2021).Characteristics of Frequent Dynamic Triggering of Microearthquakes in Southern California.Journal of Geophysical Research: Solid Earth,126(1).
MLA Fan W.,et al."Characteristics of Frequent Dynamic Triggering of Microearthquakes in Southern California".Journal of Geophysical Research: Solid Earth 126.1(2021).
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