## Exploration Activity: Numerical Modeling At Coso Geothermal Area (1999)

To determine three-dimensional P and S waves velocity structures

High precision P and S wave travel times for 2104 microearthquakes with focus <6 km are used in a non-linear inversion to derive high-resolution 3-D compressional and shear velocity structures at the Coso Geothermal Area. Block size for the inversion is 0.2 km horizontally and 0.5 km vertically and inversions are investigated in the upper 5 km of the geothermal area. Spatial resolution, calculated by synthetic modeling of a cross model at critical locations, is estimated to be 0.35 km for V

_{p} and 0.5 km for V

_{s} . In the 2 km southwest Sugarloaf region, we found low V

_{p} and high V

_{s} at geothermal production depths from 1 to 2.5 km. Combined with attenuation results, this may represent a hot, fluid-depleted center of magmatic activity.

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