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Earthquake Spectra 27, pp. 293-313 (2011); doi:http://dx.doi.org/10.1193/1.3574226

Probabilistic Fault Displacement Hazards for the Southern San Andreas Fault Using Scenarios and Empirical Slips

Rui Chen1 and Mark D. Petersen2

1California Geological Survey, 801 K Street, MS 12-32, Sacramento, CA 95814
2U.S. Geological Survey, 1711 Illinois Street, Golden, CO 80401

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We apply a probabilistic method to develop fault displacement hazard maps and profiles for the southern San Andreas Fault. Two slip models are applied: (1) scenario slip, defined by the ShakeOut rupture model, and (2) empirical slip, calculated using regression equations relating global slip to earthquake magnitude and distance along the fault. The hazard is assessed using a range of magnitudes defined by the Uniform California Earthquake Rupture Forecast and the ShakeOut. For hazard mapping we develop a methodology to partition displacement among multiple fault branches based on geological observations. Estimated displacement hazard extends a few kilometers wide in areas of multiple mapped fault branches and poor mapping accuracy. Scenario and empirical displacement hazard differs by a factor of two or three, particularly along the southernmost section of the San Andreas Fault. We recommend the empirical slip model with site-specific geological data to constrain uncertainties for engineering applications.

© 2011 Earthquake Engineering Research Institute

KEYWORDS and PACS

PACS

  • 89.60.Gg

    Impact of natural and man-made disasters

  • 89.60.Ec

    Environmental safety

  • 81.40.Np

    Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

  • 02.50.-r

    Probability theory, stochastic processes, and statistics

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ARTICLE DATA

History
Received 30 January 2010
Accepted 02 August 2010

PUBLICATION DATA

ISSN

8755-2930 (print)  

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