New evidence on the state of stress of the San Andreas fault system

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Authors:Zoback, Mark D.; Zoback, Mary Lou; Mount, Van S.; Suppe, John; Eaton, Jerry P.; Healy, John H.; Oppenheimer, David H.; Reasenberg, Paul A.; Jones, Lucile M.; Raleigh, C. Barry; Wong, Ivan G.; Scotti, Oona; Wentworth, Carl M.
Author Affiliations:Primary:
Stanford Univ., Dep. Geophys., Stanford, CA, United States
Other:
U. S. Geol. Surv., United States
Princeton Univ., United States
Lamont-Doherty Geol. Obs., United States
Woodward-Clyde Consult., United States
Volume Title:Science
Source:Science, 238(4830), p.1105-1111. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075
Publication Date:1987
Note:In English. 64 refs.; illus. incl. geol. sketch map
Summary:Contemporary in situ tectonic stress indicators 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.—Modified journal abstract. [K.F.]
Subjects:Active faults; Compression; Crust; Deformation; Displacements; Earthquakes; Faults; Field studies; Movement; North American Plate; Pacific Plate; Plate convergence; Plate tectonics; Prediction; Shear strength; Shear stress; Stress; Strike-slip faults; Tectonophysics; Uplifts; California; Central California; Coast Ranges; Kern County California; San Andreas Fault; San Bernardino County California; Santa Clara County California; Southern California; United States
Abstract Numbers:88M/4791
Record ID:1988009190
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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