Category: "Earthquake Catalogue"

NCEDC Catalogs snapshot available on Github

June 6th, 2017
The NCEDC is pleased to announce the availability of daily snapshots for the earthquake parameters catalog of the Northern California Seismic System through GitHub. This means that at any time the catalog can be retrieved as it was on a given date. 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 »

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 »

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 »

Changes to the NCSN/NCEDC catalog

July 18th, 2008
July 18th, 2008 The NCEDC has migrated all NCSN phase, catalog, and waveform information from ASCII files into the CISN database. This migration necessitated the following changes. Formerly the catalog referenced historic events without waveforms for… more »

PG&E seismic data available at the NCEDC

October 20th, 2006
October 16th, 2006 The NCEDC is pleased to announce the availability of seismic phase and waveform data from the Pacific Gas and Electric seismic network that monitors seismicity in the vicinity of the Diablo Canyon nuclear powerplant. The phase data,… more »

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