Category: "Catalogs"

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 »

Availability of Parkfield data

September 28th, 2004
The NCEDC is gathering data related to the 2004 Parkfield earthquake and making them available for researchers. Data are coming in now and will continue to be collected over the next few days and weeks. Information about the available data is here: more »

Discrepancy in magnitude from database search

June 14th, 2004
We have discovered an inconsistency between the magnitudes reported in the new database search of the UC Berkeley earthquake catalogs ( http://www.ncedc.org/db/Search/PI/dbselect.html) and the older, flat file search (… more »

BSL earthquake catalog available in database

December 19th, 2003
The NCEDC is gradually converting the Northern California earthquake catalogs from "flat files" to a database structure. At present, the BSL BDSN catalog is transferred from 1984-present and the information is accessible through a search interface here:… more »

Earthquake Catalog Search and Map

January 8th, 2003
January 8, 2003 In response to requests from many teachers, the NCEDC has created an experimental earthquake catalog search which provides seismicity maps as well as lists of earthquakes. The simplified search allows a user to select a catalog and one… more »

Changes to Northern California earthquake catalog search

November 21st, 2002
November 21, 2002 Today the NCEDC implemented modifications to eqselect and catlist, programs which search and reformat earthquake catalogs. These programs are used by the Web catalog search as well as by users with research accounts. The changes will… more »

NCSN Data Y2K Compliant

October 21st, 1999
October 21, 1999 The traditional formats used for archiving and distributing the NCSN earthquake catalog, phase, and focal mechanism data at the NCEDC were not Y2K compliant, as they contained only a 2 digit years. On October 21, 1999 the NCEDC started… more »

Revision of NCSN Catalog

April 20th, 1997
April 29, 1997 On April 29, 1997, the USGS Northern California Seismic Network (NCSN) revised the format and relocated the entire earthquake catalog at the Northern California Earthquake Data Center. We undertook the catalog revision for the following… more »

Magnitude change in UC Berkeley Earthquake Catalog

January 23rd, 1996
The UC Berkeley Seismological Laboratory recently recomputed the station adjustments used to calculate local magnitude. Using a data set of over 1000 events, Dr. Robert Uhrhammer has estimated new station adjustments for the stations of the Berkeley… more »

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