Cascading and pulse-like ruptures during the 2019 Ridgecrest earthquakes in the Eastern California Shear Zone

Kejie Chen; Jean Philippe Avouac; Saif Aati; Chris Milliner; Fu Zheng; Chuang Shi

doi:10.1038/s41467-019-13750-w

Cascading and pulse-like ruptures during the 2019 Ridgecrest earthquakes in the Eastern California Shear Zone

Kejie Chen
, Jean Philippe Avouac
, Saif Aati
, Chris Milliner
, Fu Zheng
, Chuang Shi

School of Geog & Environmental Scs

Research output: Contribution to journal › Article › peer-review

127 Citations (Scopus)

112 Downloads (Pure)

Abstract

On July 4 2019, a M_w 6.5 earthquake, followed 34 h later by a M_w 7.1 event, struck Searles Valley, California. These events are part of a long-lived cluster of historical earthquakes along the Eastern California Shear Zone (ECSZ) which started in 1872 and are associated with temporarily elevated strain rates. We find that the M_w 6.5 event initiated on a right-lateral NW striking fault and then ruptured a left-lateral fault to the surface. This event triggered right-lateral slip during the M_w 7.1 earthquake. It started as a bilateral, crack-like rupture on a segment brought closer to failure by the M_w 6.5 event. The rupture evolved to pulse-like as it propagated at a relatively slow velocity (2 km/s) along a segment that was unloaded by the M_w 6.5 event. It stopped abruptly at the Coso volcanic area and at the Garlock Fault and brought some neighbouring faults closer to failure.

Original language	English
Article number	22
Journal	Nature Communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-13750-w
Publication status	Published (in print/issue) - 7 Jan 2020

Funding

This work was partially supported by the National Science Foundation through grant EAR-182185. Part of this research was also supported by the National Aeronautics and Space Administration, and performed at the Jet Propulsion Laboratory, California Institute of Technology. We are grateful to ARIA project of the Jet Propulsion Laboratory for making their ALOS-2 and Sentinel-1 displacements publicly available and Cunren Liang for discussions of the InSAR data processing.

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Cascading and pulse_like ruptures_Final Published VersionFinal published version, 2.4 MBLicence: CC BY

Cite this

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title = "Cascading and pulse-like ruptures during the 2019 Ridgecrest earthquakes in the Eastern California Shear Zone",

abstract = "On July 4 2019, a Mw 6.5 earthquake, followed 34 h later by a Mw 7.1 event, struck Searles Valley, California. These events are part of a long-lived cluster of historical earthquakes along the Eastern California Shear Zone (ECSZ) which started in 1872 and are associated with temporarily elevated strain rates. We find that the Mw 6.5 event initiated on a right-lateral NW striking fault and then ruptured a left-lateral fault to the surface. This event triggered right-lateral slip during the Mw 7.1 earthquake. It started as a bilateral, crack-like rupture on a segment brought closer to failure by the Mw 6.5 event. The rupture evolved to pulse-like as it propagated at a relatively slow velocity (2 km/s) along a segment that was unloaded by the Mw 6.5 event. It stopped abruptly at the Coso volcanic area and at the Garlock Fault and brought some neighbouring faults closer to failure.",

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AU - Zheng, Fu

AU - Shi, Chuang

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AB - On July 4 2019, a Mw 6.5 earthquake, followed 34 h later by a Mw 7.1 event, struck Searles Valley, California. These events are part of a long-lived cluster of historical earthquakes along the Eastern California Shear Zone (ECSZ) which started in 1872 and are associated with temporarily elevated strain rates. We find that the Mw 6.5 event initiated on a right-lateral NW striking fault and then ruptured a left-lateral fault to the surface. This event triggered right-lateral slip during the Mw 7.1 earthquake. It started as a bilateral, crack-like rupture on a segment brought closer to failure by the Mw 6.5 event. The rupture evolved to pulse-like as it propagated at a relatively slow velocity (2 km/s) along a segment that was unloaded by the Mw 6.5 event. It stopped abruptly at the Coso volcanic area and at the Garlock Fault and brought some neighbouring faults closer to failure.

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Cascading and pulse-like ruptures during the 2019 Ridgecrest earthquakes in the Eastern California Shear Zone

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