Catalog of locations of U.S.G.S. instruments recording low-frequency data in California

During the past few years, the U.S. Geological Survey has installed many different types of instrumentation for the observation and detection of crustal deformation within the San Andreas fault system. In order to have an effective earthquake prediction program, it is important to have continuous data from these instruments collected at a central site. A second prerequisite is to provide adequate coverage throughout the large region of active faulting in this system.