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  • Title: Lateral P-Velocity Gradients near Major Strike-Slip Faults in California.
    Author: Stierman DJ, Zappe SO.
    Journal: Science; 1981 Jul 10; 213(4504):207-9. PubMed ID: 17782784.
    Abstract:
    The P-wave velocity in shallow crystalline rock decreases systematically from a normal value of about 5.5 kilometers per second 20 kilometers or more from the Garlock and San Andreas faults to less than 3 kilometers per second at distances of less than 2 kilometers from these faults. This lateral velocity gradient closely resembles the shear stress profile. It is proposed that the velocity gradient results from increased fracturing nearer these major strike-slip faults and that this fracturing dominates the response of the shallow crust to tectonic stress.
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