The Cape Mendocino earthquakes of April 25 and 26, 1992

Abstract

40.368N. 124.316W. 15km 6.3mb (GS),7.1Ms (GS) 07 41 39.7 40.415N. 124.603W. 20km 5.9mb(GS),6.6Ms (GS) 11 18 25.7 40.378N. 124.575W. 22km 6.5mb(GS),6.6Ms(GS) A postmaster questionnaire canvass was made to determine intensities and the extent of the felt area for the 1st and 3rd earthquakes (the 2nd earthquake was not canvassed). Tables 1 and 2 (pp. 10-26) list the preliminary intensities that were determined from these postmaster questionnaire canvasses. Also, a USGS field team was dispatched to the epicentral area to conduct a damage survey in the communities that were most affected by the earthquakes. In the course of the survey, damage information was collected through observations and by interviews with residents. The following newspaper sources were used to collate additional damage information: