The 2020 Westmorland, California Earthquake Swarm as Aftershocks of a Slow Slip Event Sustained by Fluid Flow
نویسندگان
چکیده
Swarms are bursts of earthquakes without an obvious mainshock. Some have been observed to be associated with transient aseismic fault slip, while others thought related fluids. However, the association is rarely quantitative due insufficient data quality. We use high-quality GPS/GNSS, InSAR, and relocated seismicity study a swarm >2,000 which occurred between 30 September 6 October 2020, near Westmorland, California. Using 5 min sampled Global Positioning System (GPS) supplemented we document spontaneous shallow Mw 5.2 slow slip event that preceded by 2–15 hr. The in early phase were predominantly non-interacting driven primarily resulting nonlinear expansion. A stress-driven model based on rate-and-state friction successfully explains overall spatial temporal evolution earthquakes, including time lag onset swarm. Later, distinct back front square root expansion clustered en-echelon structures suggest fluids helped sustain Static stress triggering analysis using Coulomb statistics interevent times 45%–65% was event, 10%–35% inter-earthquake interactions, 10%–30% Our also provides constraints parameter pore pressure suggests this behaved like aftershock sequence but mainshock replaced event.
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Solid Earth
سال: 2022
ISSN: ['2169-9356', '2169-9313']
DOI: https://doi.org/10.1029/2022jb024693