Slip correlations on a creeping fault

Details Slip correlations on a creeping fault Slip correlations on a creeping fault

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2137p&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 10, p. 2137-2140

Physics

2

Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Seismology: Earthquake Dynamics And Mechanics, Seismology: Theory And Modeling

Scientific paper

Using a quasi-static three dimensional fault model which accounts for long range elastic interactions, we examine the influence of spatial heterogeneities of frictional strength on the slip distribution along a creeping fault. Slip fluctuates spatially because of pinning on local asperities. We show that three regimes of slip correlations exist. The first regime results in a uniform slip as in an homogeneous medium. On the contrary, slip in the second regime highly fluctuates and is controlled by heterogeneities of frictional strength. The third regime is intermediate and develops areas of high slip that are much bigger than the local asperity size (self-affine properties of the slip distribution). This particular regime illustrates the possible misinterpretation of low frequency slip data (e.g. interferometric and GPS data) in terms of structural or compositional properties along the fault.

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