West Flank Coso FORGE: Refined Earthquake Focal Mechanism Catalog for Southern California (1981-2010)


A refined earthquake mechanism catalog for southern Califiornia using the HASH method and locations derived from waveform cross-correlation. Each focal mechanism is obtained from grid searching for the best-fitting double-couple focal mechanism solution to both the P-wave first motion polarity records that were picked by network analysts, and the S/P amplitude ratios computed from three-component seismograms. This dataset includes around 179,000 focal mechanisms for earthquakes occurring 1981 through 2010 in southern California region. Updated datasets (through 9/30/2016) are included at the bottom of the linked page.

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Additional Info

DOE Project Name: Frontier Observatory for Research in Geothermal Energy: Coso, CA
DOE Project Number: EE0007156
DOE Project Lead: Lauren Boyd
Last Updated: over a year ago
Data from December, 2014
Submitted Apr 7, 2016


Sandia National Laboratories


Publicly accessible License 


Doug Blankenship
Sandia National Laboratories


geothermal, FORGE, EGS, focal mechanism, earthquake catalog, West Flank, Coso, earthquake focal mechanism, earthquake, catalog, California


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