Hierarchical interlocked orthogonal faulting in the 2019 Ridgecrest earthquake sequence

被引：342

作者：

Ross, Zachary E. ^{[1
]}

Idini, Benjamin ^{[1
]}

Jia, Zhe ^{[1
]}

Stephenson, Oliver L. ^{[1
]}

Zhong, Minyan ^{[1
]}

Wang, Xin ^{[1
]}

Zhan, Zhongwen ^{[1
]}

Simons, Mark ^{[1
]}

Fielding, Eric J. ^{[2
]}

Yun, Sang-Ho ^{[2
]}

Hauksson, Egill ^{[1
]}

Moore, Angelyn W. ^{[2
]}

Liu, Zhen ^{[2
]}

Jung, Jungkyo ^{[2
]}

机构：

[1] CALTECH, Seismol Lab, Pasadena, CA 91125 USA

[2] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

来源：

SCIENCE | 2019年 / 366卷 / 6463期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

GARLOCK FAULT; SURFACE DEFORMATION; CRUSTAL STRUCTURE; SEISMICITY; CALIFORNIA; SLIP; INVERSION; RUPTURE; LANDERS; INSAR;

D O I：

10.1126/science.aaz0109

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A nearly 20-year hiatus in major seismic activity in southern California ended on 4 July 2019 with a sequence of intersecting earthquakes near the city of Ridgecrest, California. This sequence included a foreshock with a moment magnitude (M-w) of 6.4 followed by a M-w 7.1 mainshock nearly 34 hours later. Geodetic, seismic, and seismicity data provided an integrative view of this sequence, which ruptured an unmapped multiscale network of interlaced orthogonal faults. This complex fault geometry persists over the entire seismogenic depth range. The rupture of the mainshock terminated only a few kilometers from the major regional Garlock fault, triggering shallow creep and a substantial earthquake swarm. The repeated occurrence of multifault ruptures, as revealed by modern instrumentation and analysis techniques, poses a formidable challenge in quantifying regional seismic hazards.

引用

页码：346 / +

页数：41

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