气候变化领域集成服务门户(CCPortal): Optimally Oriented Remote Triggering in the Coso Geothermal Region

CCPortal

DOI	10.1029/2019JB019131
	Optimally Oriented Remote Triggering in the Coso Geothermal Region
	Alfaro-Diaz R.; Velasco A.A.; Pankow K.L.; Kilb D.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Defining the nature of faulting, the stress needed to trigger earthquakes, and the stress state of faults remains fundamental to understanding the earthquake cycle. Studying remote dynamic triggering allows us to probe faults to systemically address the fundamental physical mechanisms of faulting. Using 13 years of data (2004–2016) from the EarthScope USArray Transportable Array and the Southern California Seismic Network, we search for remotely triggered seismicity in an extended region encompassing the Coso Geothermal Field (CGF+), California. We first apply a short term to long-term average ratio detector to high-pass (5 Hz) filtered waveforms spanning ±5 hr encompassing 211 M ≥ 7 global earthquakes. We visually inspect these waveforms to identify uncatalogued local earthquakes. We use the augmented local earthquake catalog to investigate remote earthquake triggering in the CGF+ region. Of the 211 remote mainshocks, we find 32 (15%) produce a statistically significant increase in seismicity following the P wave arrival in CGF+. An additional nine mainshocks had local earthquakes coincident with the surface waves passage but lacked a significant rate increase. Of the 41 (19%) triggering mainshocks, 28 and 13 exhibit instantaneous and delayed triggering, respectively. We find no correlation between triggering and mainshock depth, peak dynamic stress, nor mainshock focal mechanism type. Instead, results suggest the CGF+ may be optimally oriented for remote triggering from mainshocks in the West Pacific and South America and propose the reason for this is that the transient dynamic stresses align favorably with the local stress field (most compressive horizontal stress, SHmax) to promote triggering. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Coso Geothermal Field; dynamic; earthquakes; triggered
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/187695
作者单位	EES-17 (Geophysics), Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Geological Sciences, University of Texas at El Paso, El Paso, TX, United States; University of Utah Seismograph Stations, University of Utah, Salt Lake City, UT, United States; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
推荐引用方式 GB/T 7714	Alfaro-Diaz R.,Velasco A.A.,Pankow K.L.,et al. Optimally Oriented Remote Triggering in the Coso Geothermal Region[J],2020,125(8).
APA	Alfaro-Diaz R.,Velasco A.A.,Pankow K.L.,&Kilb D..(2020).Optimally Oriented Remote Triggering in the Coso Geothermal Region.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Alfaro-Diaz R.,et al."Optimally Oriented Remote Triggering in the Coso Geothermal Region".Journal of Geophysical Research: Solid Earth 125.8(2020).