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Title: In situ seismic investigation of Coyote Dam
Authors: United States. Army. Corps of Engineers. San Francisco District.
Wahl, Ronald E.
Llopis, José L.
Ballard, Robert F.
Keywords: Coyote Dam
Russian River
Seismic surveys
Elastic waves
Seismic investigations
Seismic refraction
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-81-1.
Description: Miscellaneous Paper
Abstract: An in situ seismic investigation consisting of surface refraction seismic, downhole, and crosshole tests was conducted at Coyote Dam, near Ukiah, California. Compression- and shear-wave (P- and S-wave) velocities as a function of depth were determined at two cross sections of the dam (sta 118+00 and 126+00). P- and S-wave velocity profiles were also determined for the materials which comprise the left abutment. The profiles constructed for the dam showed that P- wave velocities in the core increased from 2100 to 4000 fps with depth. The random fill section of the dam was determined to have a velocity of 3600 fps. A horizontal gravel blanket drain underlying the random section was determined to have a velocity of 4800 fps. The P- wave velocity of the dam's foundation materials had velocities ranging between 4100 and 7600 fps. The S-wave velocity profiles showed that velocities in the dam's core increased from 850 to 1250 fps except at sta 126+00 where a velocity of 950 fps was noted for the lower 50 ft of core material. The random fill section of the dam had a velocity of 1400 fps, with its underlying horizontal fravel drain having a velocity of 1600 fps. The foundation materials were determines to have velocities between 1450 and 2650 fps. The materials on the left abutment displayed P-wave velocities ranging between 1600 and 5500 fps. The S-wave velocities for these materials ranged between 850 and 1950 fps.
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