Figure 6. One-dimensional velocity model used for earthquake relocation and other representative velocity models. (a) Velocities for the uppermost layers were chosen based on local refraction experiments. Refraction velocities are from a compilation presented by Carbonell et al. [1998, and references therein]. (b) Velocities at greater depths were chosen to lie close to PM2 . Jefferys-Bullen and IASPEI91 models are shown for reference.