气候变化领域集成服务门户(CCPortal): Detailed Investigation of the Foreshock Sequence of the 2010 Mw7.2 El Mayor-Cucapah Earthquake

CCPortal

DOI	10.1029/2019JB019076
	Detailed Investigation of the Foreshock Sequence of the 2010 Mw7.2 El Mayor-Cucapah Earthquake
	Yao D.; Huang Y.; Peng Z.; Castro R.R.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	Foreshocks can provide valuable information about possible nucleation process of a mainshock. However, their physical mechanisms are still under debate. In this study, we present a comprehensive analysis of the earthquake sequence preceding the 2010 Mw7.2 El Mayor-Cucapah mainshock, including waveform detection of missing smaller events, relative relocation, and source parameter analysis. Based on a template matching method, we find a tenfold increase in the number of earthquakes than reported in the Southern California Seismic Network catalog. The entire sequence exhibits nearly continuous episodes of foreshocks that can be loosely separated into two active clusters. Relocated foreshocks show several seismicity streaks at depth, with a consistently active cluster at depths between 14 and 16 km where the mainshock was nucleated. Stress drop measurements from a spectral ratio approach based on empirical Green's functions show a range between 3.8 and 41.7 MPa with a median of 13.0 MPa and no clear temporal variations. The relocation results, together with the source patches estimated from earthquake corner frequencies, revealed a migration front toward the mainshock hypocenter within last 8 hr and a chain of active burst immediately 6 min prior to the mainshock. Our results support combined effects of aseismic slip and cascading failure on the evolution of foreshocks. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	earthquake detection/relocation; El Mayor-Cucapah earthquake; foreshock and mainshock nucleation; stress drop
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/187803
作者单位	Earth and Environmental Sciences, College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, MI, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Centro de Investigación Científica y de la Educación Superior de Ensenada Baja California, Ensenada, Mexico
推荐引用方式 GB/T 7714	Yao D.,Huang Y.,Peng Z.,et al. Detailed Investigation of the Foreshock Sequence of the 2010 Mw7.2 El Mayor-Cucapah Earthquake[J],2020,125(6).
APA	Yao D.,Huang Y.,Peng Z.,&Castro R.R..(2020).Detailed Investigation of the Foreshock Sequence of the 2010 Mw7.2 El Mayor-Cucapah Earthquake.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Yao D.,et al."Detailed Investigation of the Foreshock Sequence of the 2010 Mw7.2 El Mayor-Cucapah Earthquake".Journal of Geophysical Research: Solid Earth 125.6(2020).