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The SCEC/USGS community stress drop validation study using the 2019 Ridgecrest earthquake sequence

May 22, 2024

We introduce a community stress drop validation study using the 2019 Ridgecrest, California, earthquake sequence, in which researchers are invited to use a common dataset to independently estimate comparable measurements using a variety of methods. Stress drop is the change in average shear stress on a fault during earthquake rupture, and as such is a key parameter in many ground motion, rupture simulation, and source physics problems in earthquake science. Spectral stress drop is commonly estimated by fitting the shape of the radiated energy spectrum, yet estimates for an individual earthquake made by different studies can vary hugely. In this community study, sponsored jointly by the U. S. Geological Survey and Southern/Statewide California Earthquake Center, we seek to understand the sources of variability and uncertainty in earthquake stress drop through quantitative comparison of submitted stress drops. The publicly available dataset consists of nearly 13,000 earthquakes of M1 to 7 from two weeks of the 2019 Ridgecrest sequence recorded on stations within 1-degree. As a community study, findings are shared through workshops and meetings and all are invited to join at any time, at any interest level.

Publication Year 2024
Title The SCEC/USGS community stress drop validation study using the 2019 Ridgecrest earthquake sequence
DOI 10.26443/seismica.v3i1.1009
Authors Annemarie S. Baltay Sundstrom, Rachel E Abercrombie, Shanna Xianhui Chu, Taka'aki Taira
Publication Type Article
Publication Subtype Journal Article
Series Title Seismica
Index ID 70254632
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center
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