Localized and distributed creep along the southern San Andreas Fault

DOI Web Site Web Site 被引用文献2件
  • Eric O. Lindsey
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Yuri Fialko
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Yehuda Bock
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • David T. Sandwell
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • Roger Bilham
    Department of Geological Sciences University of Colorado Boulder Boulder Colorado USA

書誌事項

公開日
2014-10
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2014jb011275
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We investigate the spatial pattern of surface creep and off‐fault deformation along the southern segment of the San Andreas Fault using a combination of multiple interferometric synthetic aperture radar viewing geometries and survey‐mode GPS occupations of a dense array crossing the fault. Radar observations from Envisat during the period 2003–2010 were used to separate the pattern of horizontal and vertical motion, providing a high‐resolution image of uplift and shallow creep along the fault trace. The data reveal pervasive shallow creep along the southernmost 50 km of the fault. Creep is localized on a well‐defined fault trace only in the Mecca Hills and Durmid Hill areas, while elsewhere creep appears to be distributed over a 1–2 km wide zone surrounding the fault. The degree of strain localization is correlated with variations in the local fault strike. Using a two‐dimensional boundary element model, we show that stresses resulting from slip on a curved fault can promote or inhibit inelastic failure within the fault zone in a pattern matching the observations. The occurrence of shallow, localized interseismic fault creep within mature fault zones may thus be partly controlled by the local fault geometry and normal stress, with implications for models of fault zone evolution, shallow coseismic slip deficit, and geologic estimates of long‐term slip rates.</jats:p>

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