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|Title:||Geological-seismological evaluation of earthquake hazards at Blackfoot Dam, Idaho|
|Authors:||United States. Army. Corps of Engineers. Walla Walla District.|
Krinitzsky, E. L.
Blackfoot Dam, Idaho
Blackfoot Reservoir, Idaho
Earthquake resistant dams
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-87-4.|
Abstract: 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 : (1) Local: Distance = 0; Ms = 6.5; accel = 0.68 g; vel = 60 cm/sec; dur = 10 sec. (2) Near Field: Distance = 30 km; Ms = 7. 5; accel = 0.68 g; vel = 60 cm/sec, dur = 10 sec. (3) Far Field : Distance = 80 km; Ms = 7.5; accel = 0.25 g; vel = 48 cm/sec, dur - 65 sec. 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.
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