Global ETD Search
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 18 of 18 for “"tectonic stress"”.
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Fault Lines
… aims to draw connections between the geological tectonic stress and rebalancing process and the human experience of stress, disruption, and rebalancing. The composition allows an opportunity for an electronic performer’s artistic variation from performance to performance based on the choices of …
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REGIONAL STRESS REGIME STUDY OF EAST TEXAS BASED ON ORIENTATION OF FRACTURES IN THE WECHES FORMATION
… was used to infer information about the regional stress regime based on the direction of maximum/minimum horizontal stresses (SHmax / SHmin) that formed the fractures. This is based on the principle that systematic, steeply dipping, mode I joints propagate in the direction of SHmax and normal to …
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ΘΕΡΜΟΜΗΧΑΝΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΤΗΣ ΛΙΘΟΣΦΑΙΡΑΣ ΣΤΟΝ ΕΛΛΗΝΙΚΟ ΧΩΡΟ
… OF THE GEOLOGIC TIME. THEMAIN DATA USED ARE NEOTECTONIC ONES, ABSOLUTE VALUES OF THE EFFECTIVE PRINCIPAL STRESSES MEASURED THROUGH HYDROFRACTURING IN OIL WELLS, THE TECTONIC SUBSIDENCE OF NEOGENE SEDIMENTARY BASINS, TEMPERATURE MEASUREMENTS AND ESTIMATED HEAT FLOW, PALEOGEOTHERMAL INDICATORS, …
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Oblique Seafloor Spreading, the Malpelo Plate Hypothesis, and Cocos-Nazca-Pacific Plate Motion Circuit
… overpressure or to unusual directions of remote tectonic stress or to ongoing plate boundary reorganizations or to some combination of these. We show along a segment of the Cocos-Pacific plate boundary that inferred magma overpressure is only one-fourth as large as remote tectonic stress, …
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Numerical simulation of selected geologic processes based on Discrete Element Method
… potential of Ordos Block (China) under present tectonic stress regime based on Universal Distinct Element Code (UDEC). A scale-independent modeling approach based on PFC2D has been established to simulate the development of pull-apart basins. The micro-scale PFC models are used to investigate …
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Source studies over a wide range in earthquake magnitude
… over the range 10²² to 10²⁵ dyne-cm. Log Brune stress drop was found to be linearly correlated with log moment with a slope of approximately unity below 10²¹ dyne-cm, and highly correlated but with a slightly smaller slope above that point. For lower moments, stress drops increase with moment …
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Multiscale Integration of Empirical Geologic Observations with Quantitative Structural Modeling to Constrain Late Cretaceous to Eocene Paleostress Environments on the Colorado Plateau
Relating crustal deformation to stress conditions has long been a subject of interest to the geologic community as rock failure has important implications for storage and extraction of petroleum and mineral deposits, as well as sequestration efforts. The ability to relate patterns of rock …
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Influence of topographic stress on rock fracture : a two-dimensional numerical model for arbitrary surface topography and comparisons with borehole observations
… calculations indicate that topographic stresses in some landscapes may be large enough to fracture rocks, which in turn could influence slope stability, erosion rates, and bedrock hydrologic properties. These predictions typically have involved idealized topographic profiles, with few …
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An Analysis of Focal Parameters with Application to West Texas Micro-Earthquakes
… Although focal mechanisms agree with current tectonic stress in west Texas, the distribution and focal mechanisms of the micro-earthquakes suggest local stress change might be the cause to trigger existing faults. Analyzing two relatively large events with the injection history indicates they …
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GEOCHRONOLOGY, GEOCHEMISTRY, AND TECTONIC CHARACTERIZATION OF QUATERNARY LARGE-VOLUME TRAVERTINE DEPOSITS IN THE SOUTHWESTERN UNITED STATES AND THEIR IMPLICATIONS FOR CO2 SEQUESTRATION
… of dynamic mantle processes related to the tectonic setting. This dissertation includes four chapters that focus on different aspects of travertine formation and their scientific value. They are excellent, although underestimated, diagnostic tools for climatology, hydrology, tectonics, …
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The structural and engineering geology of the Country Rock at Finsch Mine
… orogeny (ca. l.l Ga). A complex structural/tectonic history is suggested whereby transtension is followed by a rotation of the tectonic stress vectors with resultant transpression. During transpression the fault-parallel jointing/cleavage is fanned by fault-parallel folds and a conjugate set …
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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
… suggested previously, but rather formed due to tectonic stress at a stepover near the southeastern end of the SGFS. To explain the existence of both shortening and extensional structures, the stress state changed over time. First, transpression associated with left-lateral strike-slip on the …
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The morphodynamics of a sand and gravel barrier, Southern Hawke Bay, North Island, New Zealand
… but are predetermined perhaps by primary tectonic stress.
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Dyke-induced earthquakes during the 2014-15 Bárðarbunga-Holuhraun rifting event, Iceland
… was produced, including over 30,000 volcano-tectonic earthquakes (VTs) associated with the dyke propagation at ∼ 6 km depth below sea level, and long-period seismicity - both long-period earthquakes (LPs) and tremor - associated with the eruption processes. The Cambridge University seismic …
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Stability of tunnels in water saturated shale under cyclic stresses: investigation on the coupling between mechanical and seepage characteristics
Under the coupled effect of water and cyclic stress, the mechanical properties of mine surrounding rock deteriorate, and its permeability changes, posing challenges to tunnel excavation support and mine stability control. The interaction between water infiltration into the rock mass and externally …
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Crustal stress variability across spatial scales - examples from Canada, Northern Switzerland and a South African gold mine
The quantitative descriptions of the state of stress in the Earth’s crust, and spatial-temporal stress changes are of great importance in terms of scientific questions as well as applied geotechnical issues. Human activities in the underground (boreholes, tunnels, caverns, reservoir management, …
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Tectonic and climatic control on the evolution of the Himalayan mountain front
… storage, which in turn might affect the state of stress and the level of fault activity. Distinguishing between different forcing mechanisms causing variations of sediment flux and tectonic activity, is therefore one of the most challenging tasks in understanding the spatiotemporal evolution of …
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Causes and Mechanisms of Remagnetisation in Palaeozoic Sedimentary Rocks - a Multidisciplinary Approach
… different from the age of the pervasive, syntectonic remagnetisation. However, the remagnetisation event was not restricted to the upper part of the fold and thrust belt and also affected the Middle Devonian strata. A characteristic enrichment in MREE is observed in Fe-oxide leachates, which …