The 2008 Wells, Nevada earthquake sequence: Source constraints using calibrated multiple event relocation and InSAR

Bulletin of the Seismological Society of America
By: , and 

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Abstract

The 2008 Wells, NV earthquake represents the largest domestic event in the conterminous U.S. outside of California since the October 1983 Borah Peak earthquake in southern Idaho. We present an improved catalog, magnitude complete to 1.6, of the foreshock-aftershock sequence, supplementing the current U.S. Geological Survey (USGS) Preliminary Determination of Epicenters (PDE) catalog with 1,928 well-located events. In order to create this catalog, both subspace and kurtosis detectors are used to obtain an initial set of earthquakes and associated locations. The latter are then calibrated through the implementation of the hypocentroidal decomposition method and relocated using the BayesLoc relocation technique. We additionally perform a finite fault slip analysis of the mainshock using InSAR observations. By combining the relocated sequence with the finite fault analysis, we show that the aftershocks occur primarily updip and along the southwestern edge of the zone of maximum slip. The aftershock locations illuminate areas of post-mainshock strain increase; aftershock depths, ranging from 5 to 16 km, are consistent with InSAR imaging, which shows that the Wells earthquake was a buried source with no observable near-surface offset.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The 2008 Wells, Nevada earthquake sequence: Source constraints using calibrated multiple event relocation and InSAR
Series title Bulletin of the Seismological Society of America
DOI 10.1785/0120160298
Volume 107
Issue 3
Year Published 2017
Language English
Publisher Seismological Society of America
Contributing office(s) Geologic Hazards Science Center
Description 11 p.
First page 1107
Last page 1117
Country United States
State Nevada
City Wells