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Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake

Science

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Abstract

The 1989 Loma Prieta, California, earthquake perturbed the static stress field over a large area of central California. The pattern of stress changes on major faults in the region predicted by models of the earthquake's dislocation agrees closely with changes in the regional seismicity rate after the earthquake. The agreement is best for models with low values of the coefficient of friction (0.1 ??? ?? ??? 0.3) on Bay Area faults. Both the stress models and measurements suggest that stresses were increased on the San Andreas fault north of the Loma Prieta rupture, but decreased slightly on the Hayward fault. This relaxation does not warrant lower probability estimates for large earthquakes on the Hayward fault in the next 30 years, however.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake
Series title:
Science
Volume
255
Issue:
5052
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1687
Last page:
1690
Number of Pages:
4