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  4. 中国科学院地球与行星物理重点实验室
Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence

文献类型：期刊论文

作者Cheng, Yifang5; Wang, Xin1,3,4; Zhan, Zhongwen3; Ben-Zion, Yehuda2,5
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2021-09-28
卷号48期号:18页码:12
ISSN号0094-8276
DOI10.1029/2021GL094515
英文摘要We investigate the non-double-couple components of 224 M >= 3.0 earthquakes in the 2019 M(w)7.1 Ridgecrest sequence, which occurred on a complex fault system in the Eastern California Shear Zone. Full moment tensors are derived using waveform data from near-fault and regional stations with a generalized cut-and-paste inversion and 3-D velocity and attenuation models. The results show limited Compensated Linear Vector Dipole components, but considerable explosive isotropic components (5%-15% of the total moments) for approximately 50 earthquakes. Most of these events occur between the M(w)6.4 foreshock and 1 day after the M(w)7.1 mainshock and are mainly distributed around the rupture ends and fault intersections. The percentage of isotropic components is reduced considerably when data recorded by near-fault stations are not included in the inversions, highlighting the importance of near-fault data. The results suggest that high-frequency damage-related radiation and other local dilatational processes are responsible for the observed isotropic source terms. Plain Language Summary Earthquakes occur when rocks below the surface break and move rapidly. Deriving earthquake source mechanisms provides information on the involved physical processes. We examine source mechanisms of M >= 3.0 earthquakes in the 2019 M(w)7.1 Ridgecrest sequence, using waveforms from 39 near-fault and regional stations. Many earthquakes are found to have considerable isotropic radiation that is not expected for pure slip motion along faults. The isotropic radiation reflects motions normal to the faults that may be caused by complex fault geometry, transient fluid pressure effects, and generation of microcracks in the rupture zones. We systematically investigate the possibility of each mechanism by analyzing the spatiotemporal variations of events with considerable isotropic components. The results suggest that rock damage in the rupture zone likely provides a major contribution to the isotropic radiation.
WOS关键词DOUBLE-COUPLE EARTHQUAKES ; SEISMIC RADIATION ; MOMENT TENSOR ; ROCK DAMAGE ; FAULT ZONE ; AFTERSHOCKS ; MECHANISMS ; INVERSION ; EXPLOSIONS ; ANISOTROPY
资助项目Young Elite Scientists Sponsorship Program by CAST[2020QNRC001] ; Southern California Earthquake Center (NSF)[EAR-1600087] ; Southern California Earthquake Center (USGS)[G17AC00047]
WOS研究方向Geology
语种英语
WOS记录号WOS:000703685100069
出版者AMER GEOPHYSICAL UNION
资助机构Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Young Elite Scientists Sponsorship Program by CAST ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (NSF) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS) ; Southern California Earthquake Center (USGS)
源URL[http://ir.iggcas.ac.cn/handle/132A11/102706]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Wang, Xin
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Univ Southern Calif, Southern Calif Earthquake Ctr, Los Angeles, CA 90007 USA
3.CALTECH, Seismol Lab, Pasadena, CA 91125 USA
4.CAS Ctr Excellence Deep Earth Sci, Beijing, Peoples R China
5.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 USA
推荐引用方式
GB/T 7714		 Cheng, Yifang,Wang, Xin,Zhan, Zhongwen,et al. Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence[J]. GEOPHYSICAL RESEARCH LETTERS,2021,48(18):12.
APA Cheng, Yifang,Wang, Xin,Zhan, Zhongwen,&Ben-Zion, Yehuda.(2021).Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence.GEOPHYSICAL RESEARCH LETTERS,48(18),12.
MLA Cheng, Yifang,et al."Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence".GEOPHYSICAL RESEARCH LETTERS 48.18(2021):12.

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来源：地质与地球物理研究所

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