Preliminary geologic map of the Idaho National Engineering Laboratory and adjoining areas, Idaho

Idaho National Laboratory Cultural Resource Management Plan

“…INL is located in the northeastern portion of the Snake River Plain near the foothills of the Lost River, Lemhi, and Bitterroot mountains in southeastern Idaho (Bonnichsen and Breckenridge 1982;Kuntz et al 1984;Link and Hackett 1988;Nace et al 1972;Nace et al 1975). The general region is a high altitude "cold desert" or, more accurately, a sagebrush-grassland steppe, with minimal precipitation of 23 cm (9 in.)…”

Site-specific probabilistic seismic hazard analyses for the Idaho National Engineering Laboratory. Volume 1: Final report

“…Three rupture scenarios were selected to -resent reasonable possibilities for the southern rupture t e e t i o n of the k c 0 segment (Figure 4-8). In scenario 1, the rupture terminates less than 1 km southeast of k c o , coincident with the southern end of the Lost River Range a n i la& Pleistocene mge-front scarps (Scott, 1982;Kuntz et al, 1994). We weighted this scenario highest (0.5) because the nearly continuous late Pleistocene fault scarps at the base of the Lost River Range indicate that ruptures have most recently and persistently extended at least this fhr south to create the topographic and structural relief of the range, although fault scarps have been modified by palmchannels of the Big Lost River at the south end of the m g e (Woodward-Clyde Federal Services, 1994; Wu and Bruhn, 1994).…”

“….In scenario 2, the rupture terminates less than 2 km west-southwest of Butte City , at the southern end of scarps on alluvium (Kuntz et al, 1994). The age of these scarps and their relation to the most recent activity on the range-front fault scarps near k c 0 is not well-understood (Woodward-Clyde Federal Services, 1994;Woodward-Clyde Federal H\CONTRACT\SK9455\SECi'ION4\7 4-7 MM05961515 Services, 1995).…”

“…The rupture for Scenario 3 terminates 12 km southeast of h o (Figure 4-8), at the southern end of monoclinal s c q s and graben within the northern portion of the Arc0 volcanic rift zone Kuntz et al, 1994). Evidence as to whether these structures that show such small total displacements (typically less than 10 m,; Wb and Bruhn, 1994) are seismogenically part of the Arc0 segment is equivocal.…”

“…This scenario was assigned a weight of 0.5. In"Scenari0 2, the rupture terminates at the southern end of the range (Figure 4-8), coincident with the southern end of the most southwestern bedrock splay of the Blue Dome segment (Kuntz et al, 1994). As the range-front morphology is suggestive of some Quaternary activity (Haller, 1988) and to include the possibility that the Blue Dome segment is active and nearing the end of a long period of seismic quiescence, we weighted this scenario 0.4.…”