Travel Time Curves at Small Distances, and Wave Velocities in Southern California

The system of seismological stations in California now makes it possible to study local shocks with considerable accuracy in many cases. Records of the following stations were available for this purpose: Pasadena, Seismological Laboratory, maintained and operated by the Carnegie Institution of Washington and the California Institute of Technology as a co-operative undertaking, and its six auxiliary stations at Mt. Wilson, Riverside, Santa Barbara, La Jolla, Tinemaha and Haiwee. The stations at Berkeley and Lick Observatory (Mt. Hamilton) operated by the University of California.