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Showing 1 to 20 of 24 for “"Thrust faulting"”.
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Active tectonics and earthquake hazards in continental mountain ranges and foreland basins
… models of the seismic wavefield produced by thrust-faulting earthquakes on mountain range fronts. The earthquake source characteristics and foreland basin structure were varied within reasonable geological bounds, and the earthquake-induced ground shaking was calculated. The earthquake source …
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The locations and characteristics of the aftershocks of the October 3, 1974, Peruvian earthquake
… roughly 65 km and is indicative of shallow underthrusting. Focal mechanisms are consistent with low angle thrust faulting. A b value of approximately 0.90 was determined for earthquakes within the Peruvian shallow seismic belt (1963-1975) and the aftershock sequence.
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Structural Geology of the Caddo Gap Area, Ouachita Mountains, Arkansas
… structural evolution of the Ouachita fold and thrust belt.</p> <p>Field work included mapping the three informal members (Lower, Middle and Upper) of the Arkansas Novaculite. Major folds within the study area include the Nelson Mountain Anticline and two synclinal folds (“South Caddo Mountain” …
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Structures in the Wabush Formation west of Wabush Lake with special reference to the Smallwood Mine
… is due not to primary deposition or to thrust faulting but to repeated folding. The first generation of folds trends easterly, the second generation trends 020°1 southwest of Wabush Lake, and 350° to 010° west of the central part of the lake. Folds of the third generation trend 040° to …
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Braided stream deposition and provenance of the Late Cretaceous-Paleocene(?) Canaan Peak Formation, Table Cliff and Kaiparowits Plateaus, southwestern Utah
… of highlands created by Cretaceous Servier-style thrust faulting to the west in southeastern Nevada and western Utah and was distributed across an extensive gravel-dominated braid-plain complex. Sediments represent multiple-cycle deposits that were transported eastward a minimum distance of 70 to …
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Evolution of the Kingman Arch, southern Nevada
… the Kingman Arch between the onset of Sevier thrust faulting (146 Ma) and deposition of the Peach Springs Tuff (18.5 Ma). The McCullough Spring conglomerate (MSC) was deposited in channels on the Precambrian basement between 40 and 18.5 Ma. The MSC contains Precambrian crystalline, …
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Stream profiles as a proxy for uplift in the San Bernardino Mountains
… the late Miocene due to transpression-related thrust faulting. Although regional uplift patterns are not as clear from this data as those of a stream profile analysis in the San Gabriel Mountains, the results observed indicate that this technique can extract useful tectonic data and provide a …
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Structure and stratigraphy of the Antelope Mountain Quartzite, Klamath Mountains, Northern California
… block in melange, and that the Duzel Phyllite is thrust over it. The Antelope Mountain has been subjected to polyphase deformation including mid-Paleozoic thrust faulting responsible for an overturned anticline, high-angle normal faulting, and younger, previously unrecognized, Cretaceous …
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Computer derived focal mechanisms for selected earthquakes off the south and west coasts of Turkey
… 1979 and 26 April 1981 events) and strike-slip thrust faulting (1 June 1977 event). All of the earthquakes occurred in this region are not far more than 50 kilometers from each other with focal depths ranging from 66 to 98 kilometers. The occurrence of opposite type of faults in the Gulf of …
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A Gis Investigation of Regional Geologic Controls on Mercury Deposits in the Southwest Region of Arkansas
… goal was accomplished by mapping the regional thrust faults and changes in lithology at an appropriate scale. Lithologic units were mapped using decision tree learning methods and a methodology, developed by Belt and Paxton (2005), dependant on topographic attributes unique to each rock type. A …
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Geology of the Millers Cove area, Roanoke, Craig and Montgomery counties, Virginia
… fault block from the Catawba syncline is an overthrust of 10 mile horizontal displacement and 10,000 foot stratigraphic displacement. The first of two different deforming forces produced folds whose axes trend N. 35° E. The second was associated with thrust faulting and caused refolding along …
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Field based study of thrust faults in the Appalachian Valley and Ridge Province Newport, Virginia
This study focuses on a series of thrust sheets exposed in the Appalachian Valley and Ridge Province Blacksburg-Pembroke area in southwest Virginia. Structures in the hanging wall of the Saltville thrust (Saltville thrust sheet) and the footwall of the Saltville thrust (Narrows thrust sheet) are …
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Sedimentology, petrology, and structure of the Moffet Creek Formation, Eastern Klamath Mountains, Northern California
… of folded turbidites that experienced younger thrust faulting. A major flat-lying thrust overlies a northeast-vergent footwall syncline indicating southwest to northeast thrusting. Similar fold vergence in the overlying Gazelle Formation may be the result of a single regional deformational …
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1. Geodetic constraints on slip rates of large Central Asian faults 2. Earthquake Emergency Education in Dushanbe, Tajikistan
… accommodated over more than 500,000 km2 on thrust faulting north of the Peshawar Basin, the Hindu Kush, and within the Pamir (12 ± 3 mm/yr), and across the Alai-South Tien Shan (10 ± 4 mm/yr) with complementary slip on the Chaman-Gardiz (-5 ± 4 mm/yr) and Darvaz-Karakul (-12 ± 4 mm/yr) shear …
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1. Geodetic constraints on slip rates of large Central Asian faults 2. Earthquake Emergency Education in Dushanbe, Tajikistan
… accommodated over more than 500,000 km2 on thrust faulting north of the Peshawar Basin, the Hindu Kush, and within the Pamir (12 ± 3 mm/yr), and across the Alai-South Tien Shan (10 ± 4 mm/yr) with complementary slip on the Chaman-Gardiz (-5 ± 4 mm/yr) and Darvaz-Karakul (-12 ± 4 mm/yr) shear …
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The kanarra fold-thrust system -- The leading edge of the sevier fold-thrust belt, southwest Utah
“The Jurassic to Eocene Sevier fold-thrust belt is the subject of continued scientific curiosity in tectonics, stratigraphy, and industry. Understanding its development in southwest Utah is hindered in part due to the multiple origins proposed for the Kanarra anticline, a major leading edge …
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Moletrack scarps to mountains: Quaternary tectonics of the central Alaska Range
… of the Alaska Range defines zones of Quaternary thrust faulting recorded in the progressive deformation of Pleistocene fluvial terraces. I use topographic profiles of these terraces and paleoseismic trenching of fault scarps to characterize the Quaternary activity and constrain the subsurface …
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Tectonostratigraphic evolution of the Sinu accretionary prism and Lower Magdalena forearc basin formed above a shallow-dipping subduction zone, Caribbean margin of Colombia
… imbricated backward breaking imbricated fan of thrust faults with out-of-sequence thrust faulting (OOST) within inner and outer parts of the prism. Inactive strike-slip faults were identified in a trench-parallel orientation where the subduction convergence direction is more oblique (>13mm/yr). …
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Physical Investigation of Field Scale Groundwater Recharge Processes in the Virginia Blue Ridge Physiographic Province
… the subsurface are controlled by a small scale thrust fault associated with regional thrust faulting within the Blue Ridge Province. Recharge rates appear to be correlated to spatial variation in the hydraulic conductivity of the regolith, which has been influenced by weathering rates and the …
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Geology of the Ashe Formation between Fries and Galax, Virginia
… upward to form inverted isograds. Thrust faulting along the Fries Fault caused extensive mylonitization of the Cranberry Gneiss and offset of the metamorphic isograds. Textural evidence indicates that mylonitization is the greatest in rocks at the Fries Fault trace, and decreases …
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