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EGS Catalog Geysers Magnitude Errors
Categories: Magnitude Errors | Northern California Earthquake Data Center (NCEDC) | The Geysers | Earthquake Catalogue | Enhanced Geothermal Systems catalog (EGS) | Catalogs
January 3, 2015
The Northern California Earthquake Data Center hosts several earthquake catalogs, including the the northern California earthquake catalogs of the USGS and BSL, the worldwide earthquake catalog of the ANSS, and the Enhanced Geothermal Systems (EGS) catalog. Below please see an announcement regarding magnitude errors for four Geysers-area earthquakes in the EGS catalog:
In reviewing Geysers data, the 4 events listed below had incorrect amplitudes from one station (DEB) that had a large amount of transient electronic noise. These amplitudes were previously included in the moment magnitude calculations for the events listed below, resulting in greatly exaggerated moment magnitude estimates. The corrected magnitude estimates, computed without the erroneous DEB amplitudes, are:
Date Time Lat Lon Depth Mag Magt Nst Gap Clo RMS SRC Event ID ---------------------------------------------------------------------------------------------- 2014/04/05 19:30:20.53 38.84790 -122.83538 2.543 0.43 (formerly 4.92) ML 0 0 0 0.05 LBL 3383465 2014/04/05 19:52:57.37 38.84423 -122.82652 2.857 1.12 (formerly 4.87) ML 0 0 0 0.01 LBL 3383466 2014/04/05 20:04:52.30 38.80133 -122.82338 1.035 0.45 (formerly 5.06) ML 0 0 0 0.03 LBL 3383470 2014/04/07 01:18:36.17 38.83748 -122.78598 0.851 0.51 (formerly 4.65) ML 0 0 0 0.04 LBL 3383663 ----------------------------------------------------------------------------------------------
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