Download or read book Kinematics of the Snake River Plain and Centennial Shear Zone Idaho from GPS and Earthquake Data written by Suzette J. Payne and published by . This book was released on 2011 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: New horizontal Global Positioning System (GPS) velocities at 405 sites using GPS phase data collected from 1994 to 2010 along with earthquakes, faults, and volcanic features reveal how contemporary strain is accommodated in the Northern Basin and Range Province. The 1994-2010 velocity field has observable gradients arising from both rotation and strain. Kinematic interpretations are guided by using a block-model approach and inverting velocities, earthquake slip vector azimuths, and dike-opening rates to simultaneously solve for angular velocities of the blocks and uniform horizontal strain rate tensors within selected blocks. The Northern Basin and Range block model has thirteen blocks representing tectonic provinces based on knowledge of geology, seismicity, volcanism, active tectonic faults, and regions with differences in observed velocities. Ten variations of the thirteen blocks are tested to assess the statistical significance of boundaries for tectonic provinces, motions along those boundaries, and estimates of long-term deformation within the provinces. From these tests, a preferred model with seven tectonic provinces is determined by applying a maximum confidence level of [greater than or equal to] 99% probability to F-distribution tests between two models to indicate one model with added boundaries has a better fit to the data over a second model. The preferred model is varied to test hypotheses of post-seismic viscoelastic relaxation, significance of dikes in accommodating extension, and bookshelf faulting in accommodating shear. Six variations of the preferred model indicate time-varying components due to viscoelastic relaxation from the 1959 Hebgen Lake, Montana and 1983 Borah Peak, Idaho earthquakes have either ceased as of 2002 or are too small to be evident in the observed velocities. Inversions with dike-opening models indicate that the previously hypothesized rapid extension by dike intrusion in volcanic rift zones to keep pace with normal faulting is not currently occurring in the Snake River Plain. Alternatively, the preferred model reveals a low deforming region (-0.1 ± 0.4 x 10 -9 yr -1 , which is not discernable from zero) covering 125 km x 650 km within the Snake River Plain and Owyhee-Oregon Plateau that is separated from the actively extending adjacent Basin and Range regions by narrow belts of localized shear. Velocities reveal rapid extension occurs to the north of the Snake River Plain in the Centennial Tectonic Belt (5.6 ± 0.7 x 10 -9 yr-1 ) and to the south in the Intermountain Seismic Belt and Great Basin (3.5 ± 0.2 x 10-9 yr-1 ). The "Centennial Shear Zone" is a NE-trending zone of up to 1.5 mm yr -1 of right-lateral shear and is the result of rapid extension in the Centennial Tectonic Belt adjacent to the low deforming region of the Snake River Plain. Variations of the preferred model that test the hypothesis of bookshelf faulting demonstrate shear does not drive Basin and Range extension in the Centennial Tectonic Belt. Instead, the velocity gradient across the Centennial Shear Zone indicates that shear is distributed and deformation is due to strike-slip faulting, distributed simple shear, regional-scale rotation, or any combination of these. Near the fastest rates of right-lateral slip, focal mechanisms are observed with strike-slip components of motion consistent with right-lateral shear. Here also, the segment boundary between two E-trending Basin and Range faults, which are oriented subparallel to the NE-trending shear zone, provides supporting Holocene to mid-Pleistocene geologic evidence for accommodation of right-lateral shear in the Centennial Shear Zone. The southernmost ends of NW-trending Basin and Range faults in the Centennial Tectonic Belt at their juncture with the eastern Snake River Plain could accommodate right-lateral shear through components of left-lateral oblique slip. Right-lateral shear may be accommodated by components of strike-slip motion on multiple NE-trending faults since geologic evidence does not support slip along one continuous NE-trending fault along the boundary between the eastern Snake River Plain and Centennial Tectonic Belt. Regional velocity gradients are best fit by nearby poles of rotation for the Centennial Tectonic Belt, Snake River Plain, Owyhee-Oregon Plateau, and eastern Oregon, indicating that clockwise rotation is driven by extension to the south in the Great Basin and not by Yellowstone hotspot volcanism or from localized extension in the Centennial Tectonic Belt. The velocity field may reveal long-term motions of the Northern Basin and Range Province. GPS-derived clockwise rotation rates are consistent with paleomagnetic rotation rates in 15-12 Ma basalts in eastern Oregon and in Eocene volcanic rocks (~48 Ma) within the Centennial Tectonic Belt.
Download or read book Seismological Research Letters written by and published by . This book was released on 1987* with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Activity operations Plan written by United States. Bureau of Land Management. Idaho Falls District. Medicine Lodge Resources Area and published by . This book was released on 1990 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earthquake Catalog for the Eastern Snake River Plain Region Idaho 43 0 44 5 N 111 5 114 o W written by John J. King and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anatomy of the Snake River Plain written by Ralph W. Maughan and published by . This book was released on 1992 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Activity operations Plan written by United States. Bureau of Land Management. Medicine Lodge Resource Area and published by . This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of the Snake River Plain Regional Aquifer system Analysis in Idaho and Eastern Oregon written by Gerald F. Lindholm and published by . This book was released on 1996 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geophysics and Tectonics of the Snake River Plain Idaho written by Don R. Mabey and published by . This book was released on 1982 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book History of Snake River Canyon Indicated by Revised Stratigraphy of Snake River Group Near Hagerman and King Hill Idaho written by Harold Edwin Malde and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lava flows and river deposits contemporaneous with entrechment of the Snake River canyon indicate drainage changes that provide a basis for improved understanding of the late Pleistocene history.
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:
Download or read book The Archaeology of the Snake River Plain written by Mark G. Plew and published by . This book was released on 2000 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Oreg Wash and Idaho written by United States. Congress. House. Committee on Rivers and Harbors and published by . This book was released on 1941 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of the Snake River Plain Regional Aquifer system Analysis in Idaho and Eastern Oregon written by Gerald F. Lindholm and published by . This book was released on 1996 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Geologic History of the Snake River Country of Idaho written by Eugene Hoffman Walker and published by . This book was released on 1963 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Ground water Resources of the Snake River Plain in Southeastern Idaho written by Geological Survey (U.S.) and published by . This book was released on 1936 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Activity operations Plan written by United States. Bureau of Land Management. Idaho Falls District. Medicine Lodge Resources Area and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
