Southern California Seismographic Network Data

Processing of aftershocks for the Northridge earthquake is complete. Therefore magnitudes for these events are still preliminary and subject to change Catalog data in the Caltech format is stored in yearly ascii *.cat files. Beginning with 1977, these files cover a time period of one year.

Events from 1932 to 1959 are listed in 193259.cat; 1960 to 1976 events in 196076.cat. The SCEC_DC catalog consists of hypocentral information for the following time periods. July 1, 1981 - January 31, 1983 July 13, 1983 - present These time periods represent the time periods for which "digital" waveform and phase arrival data are available from the SCEC_DC.

The catalog is complete for all local events greater than or equal to M3.0. Between 1981 and April 23, 1992, and February 7, 1994 to the present, the catalog is complete for events down to M1.8. The catalog is expected to be complete for all events recorded between April 23, 1992 and December 31, 1992 (the Joshua Tree-Landers- Big Bear sequence) by the middle of 1995.

Processing of the Northridge sequence aftershocks has been completed - except for magnitude calibrations. Be aware that some of the magnitudes are therefore still preliminary.