Cenozoic block uplifts in east-central Idaho and southwest Montana

Ruppel, E.T.

doi:10.3133/pp1224

Cited by 16 publications

(24 citation statements)

References 11 publications

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“…The faults are 140 to 150 km long and bound eastward tilted crustal blocks with half-graben basin structures (Ruppel 1978). Faulting is predominately dip-slip with localized amounts of strike-slip (e.g., 1983 Borah Peak earthquake; Richins et al 1987).…”

Section: Geologic Settingmentioning

confidence: 99%

Seismic Reflection Project Near the Southern Terminations of the Lost River and Lemhi Faults, Eastern Snake River Plain, Idaho

Jackson¹,

Carpenter²,

Smith³

et al. 2006

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SUMMARYThirteen seismic reflection lines were processed and interpreted to determine the southern terminations of the Lost River and Lemhi faults along the northwest boundary of the eastern Snake River Plain (ESRP). The southernmost terminations of the Arco and Howe segments were determined to support characterization of the Lost River and Lemhi fault sources, respectively, for the INL probabilistic seismic hazard analysis.Four commercial seismic reflection lines (Arco lines 81-1 and 81-2; Howe lines 81-3 and 82-2) were obtained from the Montana Power Company. The seismic data were collected in the early 1980's using a Vibroseis source with station and shot point locations that resulted in 12-fold data. Arco lines 81-1 and 81-2 and Howe lines 81-3 and 82-2 are located within the basins adjacent to the Arco and Howe segments, respectively.Seven seismic lines (Arco lines A1, A2, A3, and A4 and Howe lines H1, H2, and H3) were acquired by EG&G Idaho, Inc. Geosciences for this study using multiple impacts with an accelerated weight drop source. Station and shot point locations yielded 12-fold data. The seismic reflection lines are oriented perpendicular to and at locations along the projected extensions of the Arco and Howe fault segments within the ESRP.Two seismic lines (Arco line S2 and Howe line S4) were obtained from Sierra Geophysics. In 1984, they acquired seismic reflection data using an accelerated weight drop source with station and shot point locations that yielded 6-fold data. The two seismic reflection lines are oriented perpendicular to and at locations along the projected extensions of the Arco and Howe fault segments within the ESRP. In 1992 for this study, Geotrace Technologies Inc. processed all of the seismic reflection data using industry standard processing techniques.

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Section: Geologic Settingmentioning

confidence: 99%

Seismic Reflection Project Near the Southern Terminations of the Lost River and Lemhi Faults, Eastern Snake River Plain, Idaho

Jackson¹,

Carpenter²,

Smith³

et al. 2006

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“…Similar to the Basin and Range province south of the ESRP, the northern Basin and Range is characterized by north-northwest-trending mountain ranges bounded on one or more sides by steeply-dipping normal faults and surrounded by broad alluvial valleys Wed with late Cenozoic sediments (Ruppel, 1982). In addition to these relatively simple basins in the northern Basin and Range, some investigators recognize two other modes of extensional basin development that are probably more prevalent south of the ESRP: (1) asymmetric tilted basins displaced chiefly by a listric or planar low-angle normal fault and (2) complex basins, typically with sub-basins, associated with both planar and listric normal faults that sole into low-angle detachments (Smith and h b a s z , 1991).…”

Section: Northern Basin and Range Provincementioning

confidence: 99%

“…These faults bound the west side of eastward-tilted Paleozoic fault block (Ruppel, 1982;Scott et al, 1985) and the east side of half-gaben structures (Anders et al , 1989). The footwall of the faults consists of allochthonous paleozoic and Precambrian rocks that were transported east to northeastward on gently dipping thrust faults, from as early as the early Cretaceous and continued into the early Eocene (Ross, 1947;Skipp and Hait, 1977;Ruppel, 1978).…”

Section: Northern Basin and Range Provincementioning

confidence: 99%

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

1996

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“…The bounding faults of the parallel linear ranges and valleys, where data are available, generally are normal although Ruppel (1972Ruppel ( , 1982 …”

Section: Late Cenozoic Tectonicsmentioning

confidence: 99%

Proceedings of Workshop XIX; Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California; Volumes I and II

Hill¹,

Bailey²,

Ryall³

1984

Open-File Report

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Cenozoic block uplifts in east-central Idaho and southwest Montana

Cited by 16 publications

References 11 publications

Seismic Reflection Project Near the Southern Terminations of the Lost River and Lemhi Faults, Eastern Snake River Plain, Idaho

Seismic Reflection Project Near the Southern Terminations of the Lost River and Lemhi Faults, Eastern Snake River Plain, Idaho

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

Proceedings of Workshop XIX; Active tectonic and magmatic processes beneath Long Valley Caldera, eastern California; Volumes I and II

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