The results suggest that the velocity structure in the SCV basins is slower than modeled in the USGS v2 velocity model. Additional tests showed that the inversion is stable and the final model is obtained in 3-4 iterations (Dolenc et al., 2007). We started to test a more recent version of the USGS 3D velocity model (SF06) (Jachens et al., 2006). We are also testing the stability of the inversion with additional free parameters that will enable us to model the velocity structure within the basins with a few layers with individual velocity gradients. We will also increase the grid spacing in our modeling to include slower velocities in the shallow parts of the basins.

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