Fault zone amplified waves as a possible seismic hazard along the Calaveras fault in central California
Geophysical Research Letters
By: P. Spudich and K.B. Olsen
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Abstract
The Calaveras fault lies within a low velocity zone (LVZ) 1-2 km wide near Gilroy, California. Accelerographs G06, located in the LVZ 1.2 km from the Calaveras fault, and G07, 4 km from G06, recorded both the M 6.2 1984 Morgan Hill and the M 6.9 1989 Loma Prieta earthquakes. Comparison of the ground motions shows that a large 0.6-1.0 Hz velocity pulse observed at G06 during the Morgan Hill event may be amplified by focussing caused by the LVZ. Such amplified waves might be a mappable seismic hazard, and the zone of increased hazard can extend as much as 1.2 km from the surface trace of the fault. Finite-difference simulations of ground motions in a simplified LVZ model show a zone of amplified motion similar to the observations.
Suggested Citation
Spudich, P., Olsen, K., 2001, Fault zone amplified waves as a possible seismic hazard along the Calaveras fault in central California: Geophysical Research Letters, v. 28, no. 13, p. 2533-2536, https://doi.org/10.1029/2000GL011902.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Fault zone amplified waves as a possible seismic hazard along the Calaveras fault in central California |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2000GL011902 |
| Volume | 28 |
| Issue | 13 |
| Year Published | 2001 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 2533 |
| Last page | 2536 |