Category: "Earthquake Catalogue"

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 »

2015 wildfires take a toll on seismic monitoring

October 1st, 2015
November 1st, 2015 Figure 1: Map of stations in Northern and Central California, including NC (orange), BK (blue), CI (yellow), NP (white), and BG (pink). Not all stations of the California Integrated Seismic Network are shown. The… more »

Timing problem at Mammoth analog stations 01/22/2015 - 01/27/2015

January 30th, 2015
January 30th, 2015 The Northern California Earthquake Data Center (NCEDC) archives seismic waveform data from the Northern California Seismic Network (network code NC). This announcement refers to network NC seismic waveform data (both continuously… more »

EGS Catalog Geysers Magnitude Errors

January 3rd, 2015
January 3rd, 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… more »

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