We will conduct a seismic imaging investigation across the Napa Valley to determine the basin depth and velocities. There will be two related seismic investigations. One will be in Napa and another along the Hayward Fault in Hayward, California. The Hayward Seismic Investigation will be called: East Bay Seismic Investigation 2016 (EBSI-16), and it will be a joint effort between the California State University, East Bay (Hayward, CA) and the USGS.