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Strain accumulation across the Carrizo segment of the San Andreas Fault, California: Impact of laterally varying crustal properties

Schmalzle, G., T.H. Dixon, R. Malservisi, and R. Govers (2006), Strain accumulation across the Carrizo segment of the San Andreas Fault, California: Impact of laterally varying crustal properties, J. Geopys. Res., 111, B05403, doi:10.1029/2005JB003843.

Abstract
Major strike slip faults juxtapose geologically dissimilar terrain which may vary in mechanical properties, leading to an
asymmetric pattern of strain accumulation. We present new GPS data on the Carrizo segment of the San Andreas Fault, separating
the Salinian block southwest of the fault from Franciscan terrane northeast of the fault, to better quantify asymmetric strain
accumulation. We also present a series of finite element models to investigate the possible role of variable elastic layer
thickness and material properties of the upper crust. The geodetic data are well fit with a simple model comprising a weak
upper crustal zone 10–25 km wide northeast of the fault. This model is also consistent with geologic data on the distribution
of major rock types and corresponding laboratory data on their material properties, as well as paleoseismic, seismic and magnetotelluric
data. Using this model, we estimate a “long-term” (average over several seismic cycles) slip rate for the San Andreas Fault
of 36−1.5

+2 mm/yr in agreement with the known Holocene rate within uncertainties, and a viscosity for the combined lower crust/upper
mantle of 2–5 × 1019 Pa s.
Further information
BibTeX
@article{id69,
  author = {G. Schmalzle and T.H. Dixon and R.  Malservisi and R.  Govers},
  journal = {J. Geopys. Res.},
  month = {may},
  title = {{Strain accumulation across the Carrizo segment of the San Andreas Fault, California: Impact of laterally varying crustal properties}},
  volume = {111},
  year = {2006},
  language = {en},
  url = {http://venus.geophysik.uni-muenchen.de/~malservisi/papers/SchmalzleCarrizo{\_}2006.pdf},
  doi = {10.1029/2005JB003843},
  eid = {B05403},
}
EndNote
%0 Journal Article
%A Schmalzle, G.
%A Dixon, T.H.
%A Malservisi, R. 
%A Govers, R. 
%D 2006
%V 111
%J J. Geopys. Res.
%T Strain accumulation across the Carrizo segment of the San Andreas Fault, California: Impact of laterally varying crustal properties
%U http://venus.geophysik.uni-muenchen.de/~malservisi/papers/SchmalzleCarrizo_2006.pdf
%8 may
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Printed 31. Oct 2020 03:19