Significant creep is observed over a 25 km zone north of Santa Rosa, but not further south - in our dataset or by other workers, raising the question of the cause of this along-strike change in fault behavior. One potential factor is fault geometry - if slip were transferred eastwards to the Maacama fault, north of Santa Rosa, there would be a $\sim8$ km releasing stepover consistent with an unclamping of the Rodgers Creek fault. Further targeted PS-InSAR and GPS studies may allow us to determine where this slip transfer occurs, and thus to quantify the importance of this effect.

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