Seismic profiles in northwestern Utah: Pilot Range and Grouse Creek Range Area

Abstract

Two seismic refraction profiles were established in northwestern Utah. The first, which extended along the area lying east of the Pilot Range, was about 55 km in total length and extended south from about 10 km southeast of Lucin, Utah, to about 13 km north of Wendover, Utah. The second, which extended north into the area west of the Grouse Creek Range, was about 95 km in total length and extended north from a point about 15 km north of Wendover to the vicinity of the town of Grouse Creek, Utah. The two profiles were reversed for about 47 km of the distance. Commercial seismic prospecting equipment, modified to pass frequencies between about 3 and 50 cps, was used. Results of this study showed that materials having velocities of about 2.0, 5.5, 6.2, and 7.4(?) km/sec exist at depths of about 0, 0.8, 4, and 24 km, respectively. The apparent dips of the 5.5- and 6.2-km/sec horizons were about ¼°N and 2½°N, respectively. Reflections from the horizon at an approximate depth of 24 km were identified on seismograms taken at five of the recording locations. A second reflection, which could result from a reflecting horizon at a depth of about 27 km, was identified on four of the five seismograms.