Category: "Earthquake Catalogue"

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 »

Change in NCSN Earthquake Catalog

August 1st, 1995
The USGS Northern California Seismic Network (NCSN) has implemented a new policy regarding the archival of automatically timed (RTP) earthquake data in their catalog at the NCEDC. The RTP is an automated system that automatically picks seismic phases,… more »

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