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Science 27 July 1990:
Vol. 249. no. 4967, pp. 397 - 401
DOI: 10.1126/science.249.4967.397
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Articles

Evolution of the Northern Santa Cruz Mountains by Advection of Crust Past a San Andreas Fault Bend

Robert S. Anderson 1

1 Earth Sciences Board, University of California, Santa Cruz, CA 95064

The late Quaternary marine terraces near Santa Cruz, California, reflect uplift associated with the nearby restraining bend on the San Andreas fault. Excellent correspondence of the coseismic vertical displacement field caused by the 17 October 1989 magnitude 7.1 Loma Prieta earthquake and the present elevations of these terraces allows calculation of maximum long-term uplift rates 1 to 2 kilometers west of the San Andreas fault of 0.8 millimeters per year. Over several million years, this uplift, in concert with the right lateral translation of the resulting topography, and with continual attack by geomorphic processes, can account for the general topography of the northern Santa Cruz Mountains.


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