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Science 6 October 1967:
Vol. 158. no. 3797, pp. 116 - 118
DOI: 10.1126/science.158.3797.116
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Articles

Local Geomagnetic Events Associated with Displacements on the San Andreas Fault

Sheldon Breiner 1 and Robert L. Kovach 1

1 Department of Geophysics, Stanford University, Stanford, California 94305

The piezomagnetic properties of rock suggest that a change in subsurface stress will manifest itself as a change in the magnetic susceptibility and remanent magnetization and hence the local geomagnetic field. A differential array of magnetometers has been operating since late 1965 on the San Andreas fault in the search for piezomagnetic signals under conditions involving active fault stress. Local changes in the geomagnetic field have been observed near Hollister, California, some tens of hours preceding the onset of abrupt creep displacement on the San Andreas fault.


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