Geological-Seismological Evaluation of Earthquake Hazards at Blackfoot Dam, Idaho.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
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Blackfoot Dam and Reservoir are situated in southeast Idaho in an area of active tectonism which includes recent volcanism,hot springs, and active faults. Three earthquakes were postulated for design purposes with horizontal motions as follows dur 65 sec 1 Local Distance 0 Ms 6.5 accel j- 0.68 g, vel 60 cmsec, dur 10 ces. 2 Near field Distance 30 km Ms 7.5 accel 0.68 g, vel 60 cmsec, dur 10 sec. 3 Far field Distance 80 km Ms 7.5 accel 0.25 g, vel 48 cmsec. Accelerograms were recommended for use with these parameters. An operating basis earthquake was based on motions for the severest shaking believed to have occurred at the damsite over the past 100 years. The dam and reservoir are situated on a series of lava flows that could be interbedded with loess. Keywords Earthquake resistant design ground motion Geologic faults Liquefaction Seismic data.
- Geology, Geochemistry and Mineralogy