Abstract
Preliminary stress sensitivities of NRM of two rocks from along the San Andreas fault, California, have been investigated using a cryogenic magnetometer and uniaxial pressure vessel. Of particular interest has been the irreversible behavior in response to cycling in the stress range 0–500 bars. The effect of hydrostatic pressure has also been examined. Sensitivities parallel to the compression axis behave as predicted by simple theory and show irreversible behavior during initial stress cycles. In contrast, transverse sensitivities show significant deviations from simple theory. Stress sensitivities of NRM do not appear to be appreciably affected by increase in hydrostatic pressure up to 0.5 kb.
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