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Fault zone amplified waves as a possible seismic hazard along the Calaveras fault in central California

Geophysical Research Letters

By:
and
DOI: 10.1029/2000GL011902

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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.

Additional Publication Details

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
Number of Pages:
4