气候变化领域集成服务门户(CCPortal): Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes

CCPortal

DOI	10.1016/j.epsl.2020.116582
	Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes
	Huang H.; Meng L.; Bürgmann R.; Wang W.; Wang K.
发表日期	2020
ISSN	0012821X
卷号	551
英文摘要	The 2019 M 6.4 and M 7.1 Ridgecrest, California earthquake sequence provides an ideal opportunity to study the seismicity evolution and interaction among multiple complex fault structures. Here, we apply the matched-filter detection method to obtain a relatively complete (magnitude of completeness ≈ 0.9) and precisely relocated earthquake catalog. The results show a short-duration (∼ 31 minutes) foreshock sequence with 28 events, before the M 6.4 earthquake. The foreshock sequence started with a M 4.0 event and was aligned along the NW-SE direction. This implies that the M 6.4 rupture initiated on a NW trending fault segment, before rupturing the primary SW trending fault. Repeating earthquakes before and after the M 7.1 event are separated in space and bound the areas of large coseismic slip in the M 6.4 and M 7.1 events. This might reflect local slow slip acceleration near the edges of coseismic rupture asperities. The NW-striking fault zones illuminated by seismicity are separated into several sub-regions with distinct pre-M7.1 seismicity rate evolutions. The M 7.1 event nucleated in a region of local seismicity concentration which intensified ∼ 3 hr before the M 7.1 mainshock. The M 7.1 nucleation zone is characterized by a significantly low b value of events that occurred since the M 6.4 event, which might indicate local failure conditions approaching a critical state. © 2020 Elsevier B.V.
关键词	2019 Ridgecrest earthquake sequence b-value analysis foreshock detection and relocation spatio-temporal foreshock evolution
英文关键词	Critical current density (superconductivity); Faulting; Matched filters; Earthquake catalogs; Earthquake sequences; Filter detections; Foreshock sequences; Nucleation zone; Repeating earthquake; Short durations; Spatio temporal; Earthquakes; coseismic process; detection method; earthquake event; earthquake rupture; fault zone; foreshock; relocation; spatiotemporal analysis; California; United States
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202659
作者单位	Earth Planetary and Space Sciences, University of California, Los Angeles, CA 90025, United States; Berkeley Seismological Laboratory, Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States
推荐引用方式 GB/T 7714	Huang H.,Meng L.,Bürgmann R.,et al. Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes[J],2020,551.
APA	Huang H.,Meng L.,Bürgmann R.,Wang W.,&Wang K..(2020).Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes.Earth and Planetary Science Letters,551.
MLA	Huang H.,et al."Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes".Earth and Planetary Science Letters 551(2020).