Catalogs

For the WUS, except for California, we used the Stover and Coffman (1993), Stover, Reagor, and Algermissen (1984), PDE, and DNAG catalogs (with the addition of Alan Sanford's catalog for New Mexico). For California, we used a catalog compiled by Mark Petersen of California Division of Mines and Geology (CDMG). Mueller et al. (1996) describes the processing of the catalogs, the removal of aftershocks, and the assignment of magnitudes. We removed Utah coal-mining events from the catalog (see Mueller et al., 1996). Explosions at NTS and their aftershocks were also removed from the catalog.

As in the CEUS, the treatment of magnitudes is crucial to the hazard maps and is somewhat problematic. The magnitudes in the catalogs were converted to moment magnitudes using the scheme described in Mueller et al. (1996).