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Science 20 November 1992:
Vol. 258. no. 5086, pp. 1325 - 1328
DOI: 10.1126/science.258.5086.1325
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Articles

Changes in State of Stress on the Southern San Andreas Fault Resulting from the California Earthquake Sequence of April to June 1992

Steven C. Jaumé 1 and Lynn R. Sykes 1

1 Lamont-Doherty Geological Observatory and Department of Geological Sciences, Columbia University, Palisades, NY 10964

The April to June 1992 Landers earthquake sequence in southern California modified the state of stress along nearby segments of the San Andreas fault, causing a 50-kilometer segment of the fault to move significantly closer to failure where it passes through a compressional bend near San Gorgonio Pass. The decrease in compressive normal stress may also have reduced fluid pressures along that fault segment. As pressures are reequilibrated by diffusion, that fault segment should move closer to failure with time. That fault segment and another to the southeast probably have not ruptured in a great earthquake in about 300 years.

Submitted on August 10, 1992
Accepted on October 23, 1992


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