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Showing 1 to 20 of 57 for “"Normal-fault"”.
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Multi-timescale mechanics of an active low-angle normal fault
Detachment faults dipping < 30° commonly accrue 10’s of kms of offset and accommodate a large portion of crustal extension in moderately-to-highly extended regions. Slip on these high-offset low-angle normal faults remains perplexing due to their apparent misorientation relative to Andersonian …
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A Geophysical Delineation of A Normal Fault Within the Gulf Coastal Plain, Montgomery County, Texas
… trapping mechanisms such as anticlines, faults and salt domes. While most large salt domes have been extensively studied in the Gulf Coastal Plain, many smaller normal faults have not been studied in detail. This research study employs an integrated geophysical approach to mapping the Big …
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Normal Fault Trace-Length Scaling in a Tectonic Transition Zone in Southern Sedna Planitia, Venus
In this study, fault trace-lengths of normal faults are measured in southern Sedna Planitia, Venus between 27° to 32° latitude and 336° to 343° longitude where smooth, lowland plains transition into highland regions which are broken by basin and range style tectonics. The fault trace-lengths are …
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Characteristics of active deformation, fault interaction, and earthquake triggering in a rapidly-deforming complex normal fault network (south-west Türkiye)
… on subduction zones and continental transform faults, normal faulting earthquakes frequently cause severe destruction and casualties. Understanding earthquake occurrence and determining those faults most at risk of rupturing in destructive earthquakes is crucial to prevent disasters. A key …
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Rapid Middle to Late Miocene Slip Along the Zanskar Normal Fault, Greater Himalayan Range, NW, India: Constraints from Low-Temperature Thermochronometry
The Zanskar normal fault (ZF) is a NW-striking, moderately NE-dipping, normal fault that bounds the northern flank of the Greater Himalaya Range, NW India. The ZF is the far west continuation of the South Tibetan Detachment System (STDS), a major arc-parallel normal sense shear zone that spans the …
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Tectonics of the southern Annapurna Range, central Nepal Himalaya
… improved locations of the MCT and other faults, it is now possible to understand thermobarometric and kinematic data in more correct structural context. Thermobarometric estimates demonstrate that rocks exposed in fault-bounded blocks in the Modi Khola transect experienced approximately …
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No Triassic structural control of the development of the Middle Ground Arch, Eastern Gulf of Mexico
… Platform, to determine if there is a fault present. The seismic data show an ENE-WSW (055, 45°NW) trending normal fault; however, the downthrown block is on the NW side.Offset stratigraphic units show that the fault was active until Middle Jurassic time. If the Middle Ground …
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Analysis and modeling of induced seismicity in petroleum reservoirs
… are generated by movement along a known fault system in the field, or by some other mechanism; 2) if the source is fault related, to better understand what kind of movement is occurring on the fault; and 3) to see if this simple modeling method provides useful results, and forms a basis …
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Hydrogeology and Chemical Characterization of Hydrocarbon in Domestic Water Wells, Rancho Villa Subdivision, Rogers, Arkansas
… area is located on the up thrown block of a normal fault; stress fractures associated with the normal fault are likely conduits for the contaminant, and allow focused migration of the hydrocarbon. The water samples with visible hydrocarbon had some emulsification, indicative of microbial …
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Deformation in the striped rock pluton, southwest Virginia
… decreases northwestward. Southeastdirected normal fault displacement is common to east and northeast-trending shear zones. A minor group of northwest-oriented shear zones dip moderately southwest and northeast and show sinistral, strike-slip displacement. Quartz-, chlorite- and …
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Structural Controls of the San Emidio Geothermal System, Northwestern Nevada
… depth at the south end of the active San Emidio fault system. Abundant hydrothermal alteration along this fault zone, including acid-sulfate leaching and bleaching, native sulfur deposits, and boiling groundwater at depths less than 100 m, suggest, however, that the San Emidio geothermal resource …
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Geology of the Northern Alto Relex Area, Big Bend National Park, Brewster County, Texas
… is a prominent, near vertical, ~1000 foot-high fault-line scarp. Cretaceous rocks in the area were folded and faulted by Laramide compression, intruded by Tertiary sills and overprinted by high-angle normal faults from Basin and Range extension. During the Laramide Orogeny and Basin and Range …
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Mechanical and geological controls on the long-term evolution of normal faults
… the long-term evolution of rift-bounding normal faults. To first order, the observed diversity of extensional tectonic styles reflects differences in the maximum offset that can be accommodated on individual faults during their life span. My main objective is to develop a theoretical …
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A transverse fault in an extended terrane, the Currant Summit Fault, Nevada
Transverse faults in extensional terranes strike parallel to subparallel to the extension direction, are laterally continuous, and terminate abruptly. Problems of transverse faults are addressed by analysis of the Currant Summit fault, an east-west striking fault in east-central Nevada; Mapping of …
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Cenozoic extension superimposed on a Mesozoic thrust belt, central Nevada
… after retrodeformation of younger extensional faults; The central Pancake Range underwent multiple episodes of Cenozoic extensional faulting. Fault sets generally strike N-S or NE-SW; one synvolcanic set strikes E-W. These normal fault sets: (1) form five temporally distinct episodes that …
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Kinematics and timing of normal faulting in a metamorphic core complex: Grouse Creek Mountains, Utah
… the brittle Upper detachment, two west-dipping normal fault systems, and the 25.3 Ma Red Butte stocks are exposed in a metamorphic core complex in northwest Utah, in the central Grouse Creek Mountains. 40Ar/39Ar thermochronology and kinematic studies indicate two periods of motion along the MMSZ …
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Tectono-stratigraphic evolution of the offshore Benin Basin, SW Nigeria
… with the growth, linkage, and abandonment of normal fault systems. There is no evidence in these sequences for transform-related tectonics. Several short-lived episodes of contractional deformation probably occurred from late Aptian/early Albian to Cenozoic, with the Cretaceous events studied …
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Fault segmentation, fault linkage, and hazards along the Sevier fault, southwestern Utah
Theoretically, short normal faults link to form long faults and salients develop in the linkage zones. This project provides new data and interpretations on (1) normal fault linkage zones; (2) earthquake and landslide hazards; and (3) fold formation along the active Sevier fault, Utah. Geologic …
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Kinematics and timing of the Pinto shear zone, New York Mountains, northeastern Mojave Desert, California
… lineation, suggesting the Pinto shear zone is a normal fault. Hanging-wall deformation is accommodated by antithetic high-angle faulting localized along porphyry dike margins. Deformation fabric within the shear zone grades structurally upwards from undeformed footwall granitoids beneath the …
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A high-resolution Holocene fault activity history of the Aigion Shelf, Gulf of Corinth, Greece
… thesis reveal the behaviour of the Aigion Shelf Fault, part of one of the active normal fault systems in the Gulf of Corinth, over the past ~12 kyr, using high-resolution seismic reflection and multibeam bathymetry datasets.<br/>The Aigion Shelf Fault is part of an en echelon system comprising …
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