Objective 1. Obtain pertinent geophysical observations and attempt to predict great or very damaging earthquakes.Operate seismic networks and analyze data to determine character of seismicity preceding major earthquakes.Measure and interpret geodetic strain and elevation changes in regions of high seismic potential, especially in seismic gaps.
Geophysical monitoring instruments operated by the U. S. Geological Survey and its contractors under the Earthquake Hazards Reduction program are compiled in this report. This open-file report provides information on the type, the location, the frequency of measurement and the principal investigators monitoring these sites. This report supersedes U. S. Geological Survey Open-file 81-955. Each map is preceded by a table listing the principal scientists for each instrument system and the coordinates for each site. The coordinates were provided by each principal scientist for their particular sites. (Catherine Breckenridge provided coordinates for many of the low-frequency instruments operated by the U.S.G.S. The maps were compiled using a plotting program that maps the locations of instruments using a mercator conformal projection (written by E. Cranswick, U. S. Geological Survey). The digitization of the faults and the California borders were supplied by Frederick Lester (U. S. Geological Survey). All station coordinates are available on magnetic tape.
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