DOI: 10.1016/j.epsl.2021.117066
论文题名: The 2019 Ridgecrest, California earthquake sequence: Evolution of seismic and aseismic slip on an orthogonal fault system
作者: Yue H. ; Sun J. ; Wang M. ; Shen Z. ; Li M. ; Xue L. ; Lu W. ; Zhou Y. ; Ren C. ; Lay T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 570 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165739
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Earth and Planetary Science Letters,2021-01-01,570