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Using Crust-Mantle Coupling to Study the Behavior of Faults Near the Earth’s Surface

Moder, Christoph, and Sara Carena (2008), Using Crust-Mantle Coupling to Study the Behavior of Faults Near the Earth’s Surface, in AGU Fall Meeting 2008, pp. C1878+.

Abstract
Faults at plate boundaries accommodate the velocity gradient between adjacent plates, so their behavior is directly linked to the coupling between the crust, where these faults reside, and the mantle below. This coupling can be then exploited to study specific characteristics of faults. One example is fault strength: there is mounting evidence that at least the major faults have low effective friction. Other issues concerning fault strength are the possible variability of strength within a fault population, the strength and downward extension of both major and secondary faults below the upper crust, and the acceptable range of strength values. We approach these questions with a numerical model of the faults in California where we integrate detailed 3-D fault geometry into a global grid to obtain self-consistent boundary conditions around the area of interest. The computation is done with the 2-D finite element program SHELLS, using mantle circulation models as the driving mechanism. We then compare the results of the calculations with observed fault slip-rates, measured GPS velocities, and directions of maximum compression from the world stress map. The simulations yield low effective friction coefficients in the brittle crust for all faults, and indicate that major faults are the weakest of all and must continue downward into the ductile crust as zones of weakness.
Further information
BibTeX
@inproceedings{id1674,
  author = {Christoph Moder and Sara Carena},
  booktitle = {AGU Fall Meeting 2008},
  month = {dec},
  pages = {C1878+},
  title = {{Using Crust-Mantle Coupling to Study the Behavior of Faults Near the Earth{'}s Surface}},
  year = {2008},
  language = {en},
  url = {http://adsabs.harvard.edu/abs/2008AGUFM.T11C1878M},
}
EndNote
%A Moder, Christoph
%A Carena, Sara
%D 2008
%P C1878+
%T Using Crust-Mantle Coupling to Study the Behavior of Faults Near the Earth’s Surface
%U http://adsabs.harvard.edu/abs/2008AGUFM.T11C1878M
%8 dec
%B AGU Fall Meeting 2008
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Printed 30. Oct 2020 20:56