Regional tectonic stress near the San Andreas fault in central and southern California

J. Townend; M. D. Zoback

doi:10.1029/2003gl018918

journal article Jul 29, 2004

Regional tectonic stress near the San Andreas fault in central and southern California

J. Townend M. D. Zoback

Geophysical Research Letters Vol. 31 No. 15 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/2003gl018918

Abstract

Throughout central and southern California, a uniform NNE‐SSW direction of maximum horizontal compressive stress is observed that is remarkably consistent with the superposition of stresses arising from lateral variations in lithospheric buoyancy in the western United States, and far‐field Pacific‐North America plate interaction. In central California, the axis of maximum horizontal compressive stress lies at a high angle to the San Andreas fault (SAF). Despite relatively few observations near (±10 km) the fault, observations in the greater San Francisco Bay area indicate an angle of as much as 85°, implying extremely low fault strength. In southern California, observations of stress orientations near the SAF are rotated slightly counter‐clockwise with respect to the regional field. Nevertheless, we observe an approximately constant angle between the SAF and the maximum horizontal stress direction of 68 ± 7° along ∼400 km of the fault, indicating that the SAF has moderately low frictional strength in southern California.

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References

Details

Published: Jul 29, 2004
Vol/Issue: 31(15)
License: View

Authors

J

J. Townend

School of Earth Sciences Victoria University of Wellington Wellington New Zealand

M

M. D. Zoback

Department of Geophysics Stanford University Stanford California USA

Cite This Article

J. Townend, M. D. Zoback (2004). Regional tectonic stress near the San Andreas fault in central and southern California. Geophysical Research Letters, 31(15). https://doi.org/10.1029/2003gl018918

Regional tectonic stress near the San Andreas fault in central and southern California

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