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New Evidence on the State of Stress of the San Andreas Fault System

Zoback, Mark D., Zoback, Mary Lou, Mount, Van S., Suppe, John, Eaton, Jerry P., Healy, John H., Oppenheimer, David, Reasenberg, Paul, Jones, Lucile, Raleigh, C. Barry, Wong, Ivan G., Scotti, Oona, Wentworth, Carl·1987·Science

Abstract

Contemporary in situ tectonic stress indicators along the San Andreas fault system in central California show northeast-directed horizontal compression that is nearly perpendicular to the strike of the fault. Such compression explains recent uplift of the Coast Ranges and the numerous active reverse faults and folds that trend nearly parallel to the San Andreas and that are otherwise unexplainable in terms of strike-slip deformation. Fault-normal crustal compression in central California is proposed to result from the extremely low shear strength of the San Andreas and the slightly convergent relative motion between the Pacific and North American plates. Preliminary in situ stress data from the Cajon Pass scientific drill hole (located 3.6 kilometers northeast of the San Andreas in southern California near San Bernardino, California) are also consistent with a weak fault, as they show no right-lateral shear stress at ∼2-kilometer depth on planes parallel to the San Andreas fault.

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Crossref · 10.1126/science.238.4830.1105

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Metadata

Authors
Zoback, M. D., Zoback, M. L., Mount, V. S., Suppe, J., Eaton, J. P., Healy, J. H., Oppenheimer, D., Reasenberg, P., Jones, L., Raleigh, C. B., Wong, I. G., Scotti, O., & Wentworth, C.
Venue
Science
Published
1987-11-20
Volume
238
Issue
4830
Pages
1105-1111
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2047516202
Cited by
1,003
References
1
FWCI
25.78
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: New Evidence on the State of Stress of the San Andreas Fault System. https://app.cochat.ai/papers/10.1126/science.238.4830.1105
The paper
Zoback, M. D., Zoback, M. L., Mount, V. S., Suppe, J., Eaton, J. P., Healy, J. H., Oppenheimer, D., Reasenberg, P., Jones, L., Raleigh, C. B., Wong, I. G., Scotti, O., & Wentworth, C. (1987). New Evidence on the State of Stress of the San Andreas Fault System. Science. https://doi.org/10.1126/science.238.4830.1105

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.