Figure S1. Figure S1. Vs search range, model parameterization, and example sensitivity kernels. a) A uniform prior Vs distribution was used within search range indicated by gray shading. b) The shape of the 7 b-spline functions used to parameterize the middle to upper crust is shown with solid black lines. The plots in a and b use a depth to half-space of 21 km. That depth was allowed to vary from 20-23 km in the inversion. C) Phase velocity sensitivity to Vs structure at periods of 3, 5, 7, and 9s calculated from the mean Vs profile (Figure 3) using SensKernel-1.0 (Levshin et al., 1989). Note that the BMMC inversion does not use these kernels; it accounts for nonlinearity by repeated forward modeling. The example kernels are shown here to help illustrate the typical sensi tivity of the phase velocity measurements.