The velocities of Pn and Sn phases are determined for earthquakes originating in the northern California coastal region. The existence of station delays at Shasta, Mineral and Reno seismograph stations is proven for these earthquakes. A method of locating epicenters in this area is described, and epicenters for all large earthquakes since the installation of a station at Corvallis (1950), are found. A crustal structure consistent with observed data from these earthquakes is also presented.

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