Report

Role of Fluids in Faulting Inferred from Stress Field Signatures

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Science  09 Jul 1999:
Vol. 285, Issue 5425, pp. 236-239
DOI: 10.1126/science.285.5425.236

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Abstract

The stress orientation signature of weak faults containing high-pressure fluids has been observed for segments of the San Andreas fault system in southern California. The inferred lithostatic fluid pressures extend into the surrounding relatively intact rock in a zone scaling with the width of the interseismic strain accumulation. Repeated strain-related fracturing and crack sealing may have created low-permeability barriers that seal fluids into the network of currently active fractures.

  • * To whom correspondence should be addressed. E-mail: jlh{at}gps.caltech.edu

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