Borehole velocity measurements at five sites that recorded the Cape Mendocino, California earthquake of 25 April, 1992
Open-File Report
2002-203
By: James F. Gibbs, John C. Tinsley III, and David M. Boore
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Abstract
The U.S. Geological Survey (USGS), as part of an ongoing program to acquire seismic velocity and geologic data at locations that recorded strong-ground motions during earthquakes, has investigated five sites in the Fortuna, California region (Figure 1). We selected drill sites at strong-motion stations that recorded high accelerations (Table 1) from the Cape Mendocino earthquake (M 7.0) of 25 April 1992 (Oppenheimer et al., 1993). The boreholes were drilled to a nominal depth of 95 meters (310 ft) and cased with schedule 80 pvc-casing grouted in place at each location. S-wave and P-wave data were acquired at each site using a surface source and a borehole three-component geophone. This report contains the velocity models interpreted from the borehole data and gives reference to locations and peak accelerations at the selected strong-motion stations.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Borehole velocity measurements at five sites that recorded the Cape Mendocino, California earthquake of 25 April, 1992 |
| Series title | Open-File Report |
| Series number | 2002-203 |
| DOI | 10.3133/ofr02203 |
| Year Published | 2002 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center |
| Description | 48 p. |
| Country | United States |
| State | California |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |