Portland State University
Squier Associates, Inc.
Oregon Department of Geology and Mineral Industries
This database of earthquake information is an outgrowth of an earthquake hazard assessment program funded by DOGAMI after the 1989 Loma Prieta earthquake in California. Johnson and Scofield collected earthquake information from a variety of databases covering the Pacific Northwest and combined them, taking care to remove redundant entries. The resultant database was considered complete up through the end of 1990. This database includes the Johnson and Scofield (1990) data updated through the 25 of October, 1993, by the addition of the University of Washington Geophysics Department (UW) catalog for that period. The UW catalog data was edited to remove blasts, suspected blasts, low frequency, teleseismic, and other special events. Many categories of data present in the UW catalog (number of stations reporting, distance to nearest station, RMS residuals etc) were removed in order to conform to the format of the Johnson and Scofield (1990) data. Times in the catalog are expressed in Coordinated Universal Time which is converted to Pacific Standard time by subtracting eight hours.
More complete record of the UW catalog and details of the UW catalog quality classes can be found in the Quarterly Network Reports published by the University of Washington Geophysics Program.