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

Download or read book Seismic Reflection Project Near the Southern Terminations of the Lost River and Lemhi Faults Eastern Snake River Plain Idaho written by R. P. Smith and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirteen 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. Keywords:Keywords are required forExternal Release Review*Keywords Keywords *Contacts (Type and Name are required for each row) Type ofContactContact Name POC Editor RecordFour 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. The southern termination of the Howe segment of the Lemhi fault was placed between Howe lines H1 and H2, 2.2 km south of the fault's southernmost surface expression. In the adjacent basin, south-dipping normal faults at the northern end of Howe line 81-3 and two southwest-dipping normal faults at the northeastern end of Howe line 82-2 that can be correlated with Howe segment. South of the surface expression, two southwest-dipping normal faults on Howe line H1 can be correlated with the Howe segment. Further into the ESRP, Howe lines H2, H3, and S4 show continuous flat lying reflectors and indicate no fault offset. The southern termination of the Arco segment of the Lost River fault was placed between Arco lines S2 and A3, a distance of 4.6 km south of the fault's southernmost surface expression. Within the basin, west-dipping normal faults interpreted on Arco lines 81-1 and 81-2 can be correlated with the Arco segment. Further south within the Arco volcanic rift zone (VRZ), three seismic lines (Arco lines A2, S2, and A3) permit two interpretations. The west- and south-dipping normal faults on Arco lines A2 and S2 could be associated with slip along the Arco segment. These normal faults have an opposite dip to an east-dipping fault on Arco line A3. The observed small-offsets (

Book Tectonic and Magmatic Evolution of the Snake River Plain Volcanic Province

Download or read book Tectonic and Magmatic Evolution of the Snake River Plain Volcanic Province written by Bill Bonnichsen and published by Idaho Geological Survey. This book was released on 2002 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Addressing Earthquake Strong Ground Motion Issues at the Idaho National Engineering Laboratory

Download or read book Addressing Earthquake Strong Ground Motion Issues at the Idaho National Engineering Laboratory written by and published by . This book was released on 1991 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of reassessing seismic hazards at the Idaho National Engineering Laboratory (INEL), several key issues have been raised concerning the effects of the earthquake source and site geology on potential strong ground motions that might be generated by a large earthquake. The design earthquake for the INEL is an approximate moment magnitude (M{sub w}) 7 event that may occur on the southern portion of the Lemhi fault, a Basin and Range normal fault that is located on the northwestern boundary of the eastern Snake River Plain and the INEL, within 10 to 27km of several major facilities. Because the locations of these facilities place them at close distances to a large earthquake and generally along strike of the causative fault, the effects of source rupture dynamics (e.g., directivity) could be critical in enhancing potential ground shaking at the INEL. An additional source issue that has been addressed is the value of stress drop to use in ground motions predictions. In terms of site geology, it has been questioned whether the interbedded volcanic stratigraphy beneath the ESRP and the INEL attenuates ground motions to a greater degree than a typical rock site in the western US. These three issues have been investigated employing a stochastic ground motion methodology which incorporates the Band-Limited-White-Noise source model for both a point source and finite fault, random vibration theory and an equivalent linear approach to model soil response.

Book Interpretation of Crustal Seismic Refraction and Reflection Profiles from Yellowstone and the Eastern Snake River Plain

Download or read book Interpretation of Crustal Seismic Refraction and Reflection Profiles from Yellowstone and the Eastern Snake River Plain written by Michael McKernan Schilly and published by . This book was released on 1979 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Eastern Snake River Plain Idaho

Download or read book The Eastern Snake River Plain Idaho written by Thomas Robert LaFehr and published by . This book was released on 1962 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Seismic Refraction and Resistivity Imaging of Shallow Sedimentary volcanic Interfaces Beneath the Western Snake River Plain Near Orchard Idaho

Download or read book Seismic Refraction and Resistivity Imaging of Shallow Sedimentary volcanic Interfaces Beneath the Western Snake River Plain Near Orchard Idaho written by Steven Michael Bunch and published by . This book was released on 1992 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Method for Inversion of Two dimensional Seismic Refraction Data with Application to the Snake River Plain Region of Idaho

Download or read book A Method for Inversion of Two dimensional Seismic Refraction Data with Application to the Snake River Plain Region of Idaho written by Gregory Jay Elbring and published by . This book was released on 1984 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Crustal Flexure Adjacent to the Eastern Snake River Plain Idaho

Download or read book Crustal Flexure Adjacent to the Eastern Snake River Plain Idaho written by Nadine McQuarrie and published by . This book was released on 1997 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The 1978 Yellowstone Eastern Snake River Plain Seismic Profiling Experiment

Download or read book The 1978 Yellowstone Eastern Snake River Plain Seismic Profiling Experiment written by Robert Baer Smith and published by . This book was released on 1982 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1978 a major seismic profiling experiment was conducted in the Yellowstone-eastern Snake River Plain region of Idaho and Wyoming. Fifteen shots were recorded that provided coverage to distances of 300 km. In this paper, travel time and synthetic seismogram modeling was used to evaluate an average P wave velocity and apparent Q structure of the crust from two seismic profiles (reversed) across the Yellowstone National Park region. This area includes the well-known hydrothermal features of Yellowstone National Park (geysers, fumeroles, etc.), a large collapse caldera, and extensive silicic volcanism of Quaternary age?features attributed to shallow crustal sources of magma. The averaged crustal structure for this region as interpreted from the seismic data consists of (1) a highly variable, near-surface layer approximately 2 km thick with variable velocities of 3.0 to 4.8 km/s and a low apparent Q of 30 that is interpreted to be composed of weathered rhyolites and sedimentary infill, (2) an upper crustal layer 3 to 4 km thick with variable velocities of 4.9 to 5.5 km/s and apparent Q of 50 to 200 that is thought to represent the accumulation of the Pleistocene-Quaternary rhyolite flows, ash flow tuffs, and possible Paleozoic and Precambrian metamorphic equivalents, (3) the crystalline, upper crust that is characterized by a laterally inhomogeneous layer that varies in velocity from 4.0 to 6.1 km/s, averaging 5 km thick with a Q of 300. This layer appears to be a cooling but still hot body of granitic composition beneath the Yellowstone caldera. It is thought to be a remnant of the magma chambers that produced the Quaternary silicic volcanic rocks of the Yellowstone Plateau and may still be a major contributor to the high heat flow, (4) a laterally homogeneous intermediate crustal layer 8 to 10 km thick with a velocity of 6.5 km/s and apparent Q of 100 to 300, (5) a homogeneous 25-km-thick lower crust with a velocity of 6.7 to 6.8 km/s and an apparent Q of 300, and (6) a total crustal thickness of ?43 km. The upper crustal layer, 5.5 to 6.0 km/s, is thought to be the thermally altered equivalent of the continental crystalline basement that is normally 15 to 20 km thick in the surrounding thermally undisturbed Archean crust. An interpretation from these results suggests that mafic melts from the mantle have penetrated the lower crust without significant variations in the velocity structure but produce the main source of heat that drives the volcanic and hydrothermal systems of Yellowstone. The high apparent attenuation and large lateral velocity variations in the upper crust are consistent with a model in which partial fractionation, partial melting, and metamorphism differentiate the original upper crust to produce silicic melts that were extruded as rhyolites and ash flow tuffs across the Yellowstone Plateau. This seismic model is consistent with the evidence for a systematic northeastward propogation of silicic volcanic centers along the eastern Snake River Plain to their present location beneath the Yellowstone hydrothermal system. While these findings do not bear directly on the origin and source of the heat, i.e., mantle lumes, lithospheric fractures, mantle radiogenetic heat, basal lithospheric shearing, etc., they provide a constraint on the configuration and lateral extent of crustal layers that reflect thermal and compositional boundaries.

Book Age and amount of crustal flexure in the Lake Hills south central Idaho and implications for the subsidence of the eastern Snake River Plain

Download or read book Age and amount of crustal flexure in the Lake Hills south central Idaho and implications for the subsidence of the eastern Snake River Plain written by Milana Michalek and published by . This book was released on 2009 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Crustal Structure of the Northern Basin and Range of Western Snake River Plain

Download or read book Crustal Structure of the Northern Basin and Range of Western Snake River Plain written by Thomas Joseph Fauria and published by . This book was released on 1981 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Earthquake Probabilities for the Wasatch Front Region in Utah Idaho and Wyoming

Download or read book Earthquake Probabilities for the Wasatch Front Region in Utah Idaho and Wyoming written by Working Group on Utah Earthquake Probabilities and published by . This book was released on 2016 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication presents probabilistic earthquake forecasts developed by the Working Group on Utah Earthquake Probabilities which developed 30,50, and 100 year forecasts that include combined time dependent probabilities of large earthquakes for the five central segments of the Wasatch Fault Zone.