气候变化领域集成服务门户(CCPortal): The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system

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DOI	10.1016/j.epsl.2021.117066
	The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system
	Yue H.; Sun J.; Wang M.; Shen Z.; Li M.; Xue L.; Lu W.; Zhou Y.; Ren C.; Lay T.
发表日期	2021
ISSN	0012821X
卷号	570
英文摘要	Cascade-up and/or slow-slip processes are commonly believed to control interactions between foreshocks, mainshocks and aftershocks, but their relative contributions remain poorly resolved. Discrimination between these processes will shed light on the understanding of earthquake physics, which requires exceptional observations of earthquake sequences. The well-recorded July 2019 Ridgecrest, California foreshock-mainshock-aftershock earthquake sequence provides such an opportunity. We perform simultaneous inversion of the July 4th MW 6.4 foreshock and July 5th MW 7.1 mainshock kinematic rupture models using SAR, strong motion, and GPS data. We also invert for afterslip models following the MW 6.4 foreshock and the mainshock, respectively, by developing an inversion method that utilizes strainmeter, SAR and daily GPS time series. The inversion results show that the overall sequence involves no less than six fault segments, which include a main northwest-trending fault and secondary faults with sub-parallel and orthogonal geometry to the main fault. Co-seismic slip and afterslip have complementary patterns on the faults. During the early post-seismic period following the MW 6.4 foreshock and the mainshock, moment release on the southwest-trending fault is dominated by aseismic slip, in contrast to the predominantly seismic slip on the northwest-trending fault. The mainshock appears to be triggered by a cascade migration of foreshocks on a northwest-trending fault. Slip on the southwest-trending fault migrates from the fault junction at the northeast end (following the MW 6.4 foreshock) to the southwest end (following the mainshock) during the afterslip interval. The dual-mode (seismic versus aseismic) slip phenomena appear to be driven by co-seismic stress changes produced by the major events. © 2021 Elsevier B.V.
关键词	co-seismic/afterslip models Ridgecrest Earthquake seismic and aseismic slip
英文关键词	Fault slips; California; Co-seismic/afterslip model; Earthquake physics; Earthquake sequences; Fault system; Mainshock; Relative contribution; Ridgecrest earthquake; Seismic and aseismic slip; Seismic slips; Earthquakes; aftershock; earthquake event; fault geometry; fault slip; foreshock; GPS; strong motion; synthetic aperture radar; 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/203361
作者单位	School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Hongshan Geophysical National Observation and Research Station, Peking University, Beijing, 100871, China; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China; University of California, Los Angeles, CA 90095-1567, United States; University of California Santa Cruz, Santa Cruz, CA 95064, United States
推荐引用方式 GB/T 7714	Yue H.,Sun J.,Wang M.,et al. The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system[J],2021,570.
APA	Yue H..,Sun J..,Wang M..,Shen Z..,Li M..,...&Lay T..(2021).The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system.Earth and Planetary Science Letters,570.
MLA	Yue H.,et al."The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system".Earth and Planetary Science Letters 570(2021).