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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"normal faulting"”.
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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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Sedimentological constraints on Middle Miocene extensional tectonism of the southern Las Vegas Range, southern Nevada
… in an isolated basin during initiation of normal faulting in the Sheep Range extensional allochthon 12 to 16 Ma. After 12 Ma, deposition in this basin was terminated by normal faulting followed by oroflexural rotation along the Las Vegas Valley shear zone; The unique Middle Miocene sequence …
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Structure and stratigraphy of the Antelope Mountain Quartzite, Klamath Mountains, Northern California
… deformation including mid-Paleozoic thrust faulting responsible 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 …
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The Mechanics of Active Faulting and Mountain Building
… First I present a source model for a Mw 6.1 normal-faulting earthquake that occurred in the shallow crust of the south Peruvian Altiplano, which indicates that the Andes are extending parallel to the direction of shortening in the adjacent sub-Andean forelands. I then discuss a compilation of …
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Mechanisms of late-stage rift deformation: evidence from new 3D seismic data over the West Iberia margin
… sediments are cut by more small-scale normal faults in the north. I hypothesize that extension within the frontal basin was constrained by basement topography, specifically a small mantle ridge identified at the southern extent of the basin that may have obstructed the extension of the …
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ΧΑΡΑΚΤΗΡΙΣΤΙΚΕΣ ΠΑΡΑΜΕΤΡΟΙ ΣΕΙΣΜΙΚΗΣ ΠΗΓΗΣ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΑΝΤΙΣΤΡΟΦΗΣ ΤΩΝ ΚΥΜΑΤΩΝ ΧΩΡΟΥ: ΕΛΛΑΔΑ ΚΑΙ Η ΕΥΡΥΤΕΡΗ ΠΕΡΙΟΧΗ ΤΗΣ
… SOURCE PROPERTIES. EARTHQUAKES CAUSED BY NORMAL FAULTING HAVE RELATIVELY SIMPLE RAPTURE PROCESS COMPARED TO THE ONES DUE TO TRANSFORM FAULTS AND DURATION OF THE SOURCE CLOSE TO 10 SEC. EARTHQUAKES AT DEPTHS MORE THAN 25 KM ARE IMPULSIVE IN THEIR RAPTURE PROCESS. THE COMPUTED AVERAGESTRESS …
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Structural geology of carboniferous rocks near Marble Falls, Burnet County, Texas
… Marble Falls, Texas. Numerous northeast-trending normal faults that cut the Paleozoic and Precambrian rocks are covered by Cretaceous deposits. Faulting in the area began about the time that the Smithwick formation was being deposited and was initiated by the Llano uplift to the west. Folded and …
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Detailed studies of the structure, tectonics, near bottom magnetic anomalies and microearthquake seismicity of the Mid-Atlantic Ridge near 37°N
… valley, to explore the roles of volcanism and faulting in the evolution of oceanic crust, and to study the morphologic expression and structural history of the zone of crustal accretion. In addition, microearthquake surveys were conducted using arrays of free-floating hydrophones. The most …
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Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen
… suggesting a short lived down-to-the-east normal faulting event at ∼75 to 74 Ma. Faster cooling rates with later initial K-feldspar recording (∼71 Ma) suggest extension continued along a shallow down-to-the-southwest detachment active from ∼73 to 69 Ma. U-Th/He apatite ages suggest the Late …
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The origin of the Wilson Ridge pluton and its enclaves, northwestern Arizona: Implications for the generation of a calc-alkaline intermediate pluton in an extensional environment
… Ga Precambrian crystalline terrain. High-angle normal faulting resulted in a series of horsts and grabens that provide windows into deep structural levels of the pluton; The Wilson Ridge pluton is composed of the Teakettle Pass suite, comprised of foliated monzodiorite and quartz monzodiorite, …
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The role of extension during the evolution of the NW Indian Himalaya
… cogenetic shortening and extension. Pervasive normal faulting in an orogen, however, has been related to late syn- and post-collisional stages of mountain building with shortening focused along the peripheral sectors of the orogen. While extensional processes constitute an integral part of …
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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
… faults is cut by several NNW- to NNE-trending normal faults that together comprise a zone here named the Wolf Creek Fault Zone (WCFZ). While normal faulting, indicative of local crustal stretching, dominates, the region also contains subtle structures indicative of local crustal shortening. …
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Transform Faults, Fracture Zones, and the Kinematics of Horizontal Thermal Contraction of Oceanic Lithosphere
… of plate rigidity. Thus we cannot exclude some normal faulting in transform fault valleys. A global analysis of plate motion based on the transform fault azimuths corrected for the predicted bias due to horizontal thermal contraction shows that the hypothesis of no horizontal thermal contraction …
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New Insight Into the Thermal-Tectonic History of the Southern Antarctic Peninsula: (U-Th-Sm)/He and Fission-Track Thermochronologic Results From Northwest Palmer Land and Alexander Island
… those typical of exhumational processes such as normal faulting, ductile thinning, and erosion.</p>
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Palaeoenvironmental and palaeogeographic reconstruction of the Tequixquiac Basin, Central Eastern Mexico: Mid to late Pleistocene environments
… the Quaternary localised uplift, deformation and normal faulting have also influenced palaeohydrology and water-table elevation during the recorded depositional period (Figs 8.15 d & 8.16 d).
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Computer derived focal mechanisms for selected earthquakes off the south and west coasts of Turkey
… the Gulf of Antalya events indicated strike-slip normal (28 May 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. …
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The 2014-15 Bárðarbunga-Holuhraun magmatic rifting episode: A seismic study
… mechanism during the collapse to be steep normal faulting, with sub-vertical P-axes, striking sub-parallel to the caldera rim. The northern and southern sides of the caldera, however experienced very different seismicity rates, highlighted by the order of magnitude difference in the …
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Global investigation of large earthquakes using long-period seismic data
… large magnitude earthquakes using the Earth’s normal modes, which are standing waves resulting from the interference of surface waves travelling in opposite directions. We start by carrying out earthquake source validation tests for a recent source inversion technique (SCARDEC), which shows a …
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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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Characteristics of active deformation, fault interaction, and earthquake triggering in a rapidly-deforming complex normal fault network (south-west Türkiye)
… 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 approach to …
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