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Science 26 October 1979:
Vol. 206. no. 4417, pp. 445 - 447
DOI: 10.1126/science.206.4417.445
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Articles

Magnitude of Shear Stress on the San Andreas Fault: Implications of a Stress Measurement Profile at Shallow Depth

MARK D. ZOBACK 1 and JOHN C. ROLLER 1

1 U.S. Geological Survey, Menlo Park, California 94025

A profile of measurements of shear stress perpendicular to the San Andreas fault near Palmdale, California, shows a marked increase in stress with distance from the fault. The pattern suggests that shear stress on the fault increases slowly with depth and reaches a value on the order of the average stress released during earthquakes. This result has important implications for both long- and shortterm prediction of large earthquakes.

Submitted on February 4, 1979
Revised on May 24, 1979


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