We define our blocks as rigid entities on a spherical earth bounded by dislocations in an elastic halfspace and invert for poles and rates of rotation that minimize the misfit to the GPS velocities using the block modeling code by Meade and Hager (2005). Because our inversion combines rigid block rotation with elastic strain accumulation effects, the parameterization of the block boundary geometry is critical. Geometry of the block boundaries is based heavily on seismicity and adopted from plate reconstructions (Replumaz and Tapponnier, 2003) and prior analyses (Socquet et al., 2006a; Reilinger et al., 2006; Simons et al., 2007; Meade, 2007; Thatcher, 2007) or adjusted as indicated by the geodetic data.
Berkeley Seismological Laboratory
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