Model sensitivities

An important means of evaluating a modeled velocity field involves comparing the short-term slip rates on major faults implied by the model with the average long-term slip rates derived from geologic data. In some settings, these comparisons show that the continuum approach to estimating velocity fields explains most of the observed displacements. For example, Savage et al. (2004a) showed that a uniform velocity field involving distributed right lateral shear within a 120-km-wide zone in the Coast Ranges (Fig. 8.18) matches the vector sum of all the average slip rates determined independently for all major faults across the zone. Their approx-

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