The purpose of the GPS survey, funded by the U.S. Geological Survey's Volcano Hazards and Geothermal Studies Program, was to establish baseline measurements to detect crustal deformation that might be related to tectonic or volcanic processes. By establishing baseline measurements we hope to detect future crustal deformation that might lead to a better understand of the mechanism that creates subduction zone volcanism and tectonism in this portion of northern California and to assess the potential for future eruptions in the Cascade Range of the western United States.
The purpose of this report is to provide a field guide for future researchers who may have a need to re-occupy the listed sites. It contains photographs and descriptions of the bench marks. The network consists of 16 stations (figure 1) located between the towns of Redding, Calif. to the west, Susanville, Calif. to the east, MacArthur, Calif. to the north, and Chester, Calif. to the south. All of the stations were occupied for two consecutive days with each day's session consisting of 6 hours of observation. Station HAT CREEK, a "Very Long Baseline Interferometer" (VLBI) station, was occupied each day, and was used as a fiducial site. The data were initially processed using broadcast orbits and Ashtech's GPS Post Processing System (GPPS) software. We intend to process all the data using geodetic grade software (BERNESE), precise orbits, and tracking data for greater accuracy.
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