The Caltech/USGS Southern California catalog archived and distributed by the SCEDC does not account for local variations in the seismic velocity structure, which limits the accuracy of event locations. By applying various techniques in postprocessing of the data, researchers have been able to improve location accuracy, and some of these improved catalogs are available at the SCEDC.

SCEC has recently added two catalogs (Shearer et al., 2003; Hauksson et al., 2004) that use results from a SCEC-sponsored project that applies waveform cross-correlation to make precise differential times between nearby events. These times can then be used to greatly...

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