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 15 of 15 for “"crustal stress"”.
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Crustal Stress Heterogeneity in the Vicinity of a Geothermal Field: Coso Geothermal Field, CA
… CA record variation in the azimuth of principal stress. Image logs of these structures from five boreholes were analyzed to quantify the stress heterogeneity for three geologically distinct locations: two boreholes within the Coso Geothermal Field (one in an actively produced volume), two on the …
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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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Neotectonic deformation features in plio-pleistocene coastal aeolianites: palaeoseismology and earthquake hazard implications for the Southern Cape, South Africa
… the region, estimate the recent to current upper-crustal stress field, and infer seismic hazard. Previous studies indicate possible Quaternary faulting within the Southern Cape, major faults within the underlying geology, and a horizontal maximum compressive stress (SHmax) orientated WNWESE to …
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Inferring the thermomechanical state of the lithosphere using geophysical and geochemical observables
… the lithosphere. In Chapter 1, I correlate lower crustal rheology with seismic wave speed. Compositional variation is required to explain half of the total variability in predicted lower crustal stress, implying that constraining regional lithology is important for lower crustal geodynamics. In …
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Inferring the Thermomechanical State of the Lithosphere Using Geophysical and Geochemical Observables
… the lithosphere. In Chapter 1, I correlate lower crustal rheology with seismic wave speed. Compositional variation is required to explain half of the total variability in predicted lower crustal stress, implying that constraining regional lithology is important for lower crustal geodynamics. In …
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Modeling volcanic unrest by data assimilation
… to investigate the magma reservoir dynamics, crustal stress, failure-related seismicity, and hydrological interactions of two different magmatic systems, Laguna del Maule in the Andes, Chile, and Atka in the Aleutian, USA. In both systems, the pre-existing structures and pore fluids play …
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Remote Sensing of 21st Century Water Stress for Hazard Monitoring in California
… These mass changes can disturb the regional stress field, which may influence earthquake activity. Both the elastic and poroelastic deformation responses can be observed using satellite-based geodetic tools including Global Navigation Satellite System (GNSS) station displacements and …
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Shear Wave Splitting Analyses in West Texas
… in the Permian Basin in West Texas to understand crustal stress and induced seismicity. The selected events of ML2.0 are recorded by the TexNet and USArray/Transportable Array (TA) stations. SWS parameters, the fast polarization direction and the delay time, are computed using a semi-automatic …
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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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Volcanic deformation as an indicator of mechanical stability and eruption susceptibility
… are triggered when conditions of critical stress are achieved in the host rock around a magma reservoir, and in absence of an overpressure-driven mechanism, external factors such as faulting and tectonic forcing have been suggested as potential catalysts. Through a series of …
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Geochemical records in travertine veins at the Green River CO2 seeps (Utah)
… of the Navajo responds to seasonal changes in crustal stress, prior to man-made geyser activity.
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The 3D in-situ stress field and its changes in geothermal reservoirs
Information on the contemporary in-situ stress state of the earth’s crust is essential for geotechnical applications and physics-based seismic hazard assessment. Yet, stress data records for a data point are incomplete and their availability is usually not dense enough to allow conclusive …
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Seismic anomalies in stable continents: exploring earthquake clusters and hidden faults in Southern Africa
… raises questions about the mechanism leading to crustal stress release. A “steady-state” stress accumulation model may apply, where faults are con-tinuously loaded until the fault strength is exceeded. Alternatively an “ambient stress” model may be appropriate, where dormant ambient stress is …
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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 …