Accession Number : ADA181076

Title :   Geological-Seismological Evaluation of Earthquake Hazards at Blackfoot Dam, Idaho.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Personal Author(s) : Krinitzsky,E L

PDF Url : ADA181076

Report Date : Mar 1987

Pagination or Media Count : 89

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 dur = 65 sec: (1) Local: Distance = 0; Ms = 6.5; accel j- 0.68 g, vel = 60 cm/sec, dur = 10 ces. (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. 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.

Descriptors :   *EARTHQUAKES, *HAZARDS, *EARTH DAMS, FAULTS, RESISTANCE, GEOLOGY, IDAHO, SEISMIC DATA, MOTION, FAR FIELD, HORIZONTAL ORIENTATION, NEAR FIELD, EXTRUSION, MELTING, ROCK, VOLCANOES, TECTONICS, STRUCTURAL GEOLOGY

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE