Category: "Northern California Seismic System (NCSS)"

NCSS monitoring returned to normal after Butte and Valley fires

November 19th, 2015
November 19th, 2015 The dataflow into the Northern California Seismic Network (NCSN, netowrk code NC) has nearly returned to normal, following significant infrastructure damage from the Valley and Butte fires. This figure shows the… more »

The NCSS now reports earthquake depth relative to the geoid (sea level)

October 7th, 2015
Starting 2015/10/07, the Northern California Seismic System (NCSS) is reporting earthquake depths relative to the earth geoid surface (which is approximately mean sea level) instead of the previously used surface of the velocity model used to locate the… more »

Geoid Depth FAQ

October 7th, 2015
What is Geoid depth? The depth of an earthquake location can be reported relative to the mathematical geoid surface within the earth, which is very close to sea level. In simplified terms, the geoid is an imaginary surface within the earth… more »

Double Difference Locations Now Available

June 2nd, 2014
June 2nd, 2014 The NCEDC is pleased to announce the availability of double difference (DD) hypocenter solutions from 1984 to the present for earthquakes recorded by the Northern California Seismic System (NCSS). The NCSS catalog can be searched via… more »

NCSS event review threshold change

May 27th, 2013
The Northern California Seismic System (NCSS), operated by the US Geological Survey in Menlo Park and UC Berkeley Seismological Laboratory, locates ~20,000 earthquakes per year in the Geysers geothermal region (Figure 1). Since 2007/07/23, when data… more »

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