During 1980 and 1981, the U.S. Geological Survey collected seismic refraction data in the western Mojave Desert (fig. 1). The seismic refraction data extends from north of the Garlock Fault, south through the Mojave Desert, and across the San Andreas Fault into the San Gabriel Mountains. This report describes and documents the recorded data, which was collected over three field sessions. In total thirteen shots were fired at 11 different shotpoints (Table 1). The experiment consisted of five deployments of a set of 100 portable seismic recorders, during which seismic energy from one or more shots was recorded. The data set was acquired with five deployments of a set of 100 portable seismic recorders.