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Showing 1 to 20 of 118 for “"normal faults"”.
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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 in extensional environments. My main objective is to develop a theoretical framework that explains the controls on maximum fault offset in terms of a few key mechanical and geological controls. In Chapter 2, I propose that flexural …
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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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Structural analysis of brittle deformation features along Grenvillian shear zones in southeastern Ontario
… highs in Paleozoic cover above the RLmz. Normal faults striking NW to WNW and ESE-striking dextral strike-slip faults in the RLmz and Paleozoic cover above both shear zones are compatible with Ordovician-Devonian Taconic and Acadian stresses. Prominent NNE- and NW-striking subvertical …
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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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Solving three-dimensional problems in natural and hydraulic fracture development : insight from displacement discontinuity modeling
… fractures, joint development in the vicinity of normal faults, and hydraulic fracture height growth and non-planar propagation paths. Fracture propagation is controlled by stress intensity factor (SIF) and its determination plays a central role in LEFM. The DD modeling is used to evaluate SIF in …
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Structural style of the San Francisco Mountains, Sevier fold-thrust belt, Utah
… sheets that are overprinted by extensional faults, distorting correlations of geologic structures in the region. The Frisco thrust is exposed within the San Francisco Mountains in west-central Utah. Correlations with the better studied Canyon Range-Willard thrust to the north and the Wah Wah …
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ΝΕΟΤΕΚΤΟΝΙΚΗ ΕΞΕΛΙΞΗ ΤΗΣ ΛΕΚΑΝΗΣ ΦΛΩΡΙΝΑΣ-ΒΕΓΟΡΙΤΙΔΑΣ-ΠΤΟΛΕΜΑΙΔΑΣ (Δ. ΜΑΚΕΔΟΝΙΑ)
NEOTECTONIC ANALYSIS OF NEOGENE AND QUATERNARY FAULTS IN THE FLORINA- VEGORITIS-PTOLEMAIS BASIN OF NW MACEDONIA (GREECE) LEADS TO THE CONCLUSION THAT TWO EXTENSIONAL PHASES CAN BE DISTINGUISHED. THE FIRST ONE, WITH A NNE-SSW STRESS DIRECTION, TOOK PLACE DURING LATE MIOCENE- PLIOCENE TIMES AND WAS …
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Analysis of calcite-filled faults in carbonate strata, balcones trend near Waco, Texas.
Five normal faults exposed in the Lehigh Quarry near Waco, Texas, were analyzed. The mechanical stratigraphy of the quarry ranges from relatively strong chalk to marly chalk to chalky marl to relatively weak marl. Higher clay content yields weaker rock. The dip angle of the normal faults varies …
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Development and interaction of segmented fault systems
Faults in contractional and extensional settings have been studied, both during fieldwork and from interpretation of 2D and 3D seismic sections. Detailed analysis of the geometries of faults, with displacements of a few mm to 100's m, has provided insights into the development of fault networks. …
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Structural Analysis of Rock Canyon Near Provo, Utah
… the Rock Canyon anticline leading to late-stage normal faulting during Sevier compression. These normal faults may have activated deformed zones previously caused by Sevier folding, and reactivated early-stage decollements found in the folded weak shale units and shaly limestones. Movement on …
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Partitioning of fluid flow along faults and fractures in the Bristol Channel Basin: implications for low carbon geoscience projects in SW England
… has dated<br/>calcite slickenfibres within normal, thrust, and strike-slip faults in the East<br/>Quantoxhead and Kilve region of Somerset.<br/>Protracted N-S extension (ca. 150–120 Ma) formed normal faults, while subsequent NS shortening (ca. 50–20 Ma) involved (i) cross-cutting strike-slip …
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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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Tectonics of the Wolf Creek Fault Zone, southern Illinois: A consequence of Late Paleozoic transpression and transtension at the southeastern end of the Ste. Genevieve Fault System
… 118-mile-long (190 km-long) belt of WNW-trending faults that extends from southwestern-most Illinois, across the Mississippi River, and into southeastern Missouri, in the central (Midwest) United States. East of the Mississippi River, in an area that lies in Jackson and Union Counties, Illinois, …
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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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Structure of the Patagonian fold-thrust belt in the Magallanes region of Chile, 53° - 55° S Lat.
… the two décollements. Basement-involved reverse faults that cut the early décollements and probably reactivate Jurassic normal faults reflect Paleogene shortening. Shortening estimates increase northwest to southeast from 26 to 37% over 100 km along-strike and are consistent with regional models …
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The tectonic evolution of the Eastern Limassol Forest Complex, Cyprus
… reactivation of transform-related structures as normal faults, which have been rotated 'falling domino' style, together with the greater part of the axis sequence crust, above a decollement horizon located near to the petrological Moho. Extensional strain was preferentially accommodated in the …
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Structure and stratigraphy of the Antelope Mountain Quartzite, Klamath Mountains, Northern California
… for an overturned anticline, high-angle normal faulting, and younger, previously unrecognized, Cretaceous high-angle normal faulting. The Antelope Mountain Quartzite contains a mappable stratigraphy including black chert, red argillite, and resistant quartzite beds that are used to …
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The Mechanics of Active Faulting and Mountain Building
… on the rheological properties of active faults, and to investigate the influence of fault rheology on mountain building. The first chapter studies the postseismic deformation following the 2003 Bam earthquake in south-eastern Iran, with the intention of probing the material properties of …
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Characterization of a blind geothermal prospect through LiDAR analysis and shallow temperature survey, Gabbs Valley, Nye and Mineral Co., NV
… recent fault motions increase permeability in faults and associated fractures allowing for the circulation of fluids to geothermal heat sources and back to shallow depths. Gabbs Valley is bounded by inwardly dipping east and west dipping range bounding normal faults. These faults along with …
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Structural Controls of the San Emidio Geothermal System, Northwestern Nevada
… analysis, suggest that north-northeast striking faults and fractures are favorably oriented for fluid flow under west-northwest-directed extension. The San Emidio geothermal system and Wind Mountain epithermal deposit occupy intersections between favorably oriented north-northeast-striking normal …
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