OFR 97–464: Page [2]
includes improved hypocentral parameters and magnitudes for earthquakes with duration magnitude >= 3.0. They argued that duration gives more reliable magnitudes than amplitudes measured from analog traces converted to equivalent Wood-Anderson traces (the method used for their earlier contribution to the DNAG catalog). This catalog contains 111 records from 1962 to 1994.
National Center for Earthquake Engineering Research (NCEER)
The NCEER catalog (Seeber and Armbruster, 1991) covers the central and eastern United States and southeastern Canada, roughly east of -105o longitude. In our version each record contains a single mb-like magnitude (or Mn or mblg); there is apparently no lower magnitude cutoff. This catalog contains approximately 3,500 records from 1626 to February 1985.
Seismicity of the United States (USHIS)
We downloaded the entire USHIS catalog (Stover and Coffman, 1993) from the NEIC computer in Golden using NEIC's catalog-search software. It lists United States earthquakes with Modified Mercalli Intensity >= 6 or magnitude >= 4.5 (magnitude >= 5.5 in offshore areas of California, Oregon, and Washington). Earthquakes in Mexico, Canada, or offshore regions are included if they caused damage in the United States. The USHIS catalog is primarily a compilation of published seismicity studies and other catalogs. In our version each record contains zero to four magnitude entries: mb and/or Ms determined by NEIC and/or up to two magnitude values (of any type) contributed by other agencies. For contributed magnitudes the magnitude type and contributing agency are listed. There are approximately 450 contributed moment magnitudes. The contiguous-48-states part of this catalog contains approximately 2,700 records from 1568 to December 1989.
Stover, Reagor, Algermissen (SRA)
We downloaded the entire SRA catalog (Stover et al, 1984) from the NEIC computer in Golden using NEIC's catalog-search software. Like USHIS, SRA lists United States earthquakes, and is primarily a compilation of published seismicity studies and other catalogs. SRA is much larger than USHIS because it lists smaller events, but it is less consistent in completeness and coverage, especially west of -117o longitude. In many cases SRA includes valuable data from local networks. For example, data from the University of Utah network contributes prominently to the Utah part of the SRA catalog. In our version each record contains zero to four magnitude entries: mb and/or Ms determined by NEIC and/or up to two magnitude values (of any type) contributed by other agencies. For contributed magnitudes the magnitude type and contributing...>>NEXT
Last Update: Thursday, February 16, 2006 9:58
