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 20 of 29 for “"fracture zones"”.
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Collisional Reactivation of Rift Margin Fracture Zones, Taiwan and the Taconic Allochthon
… due to the Reactivation of a Partially-Subducted Fracture Zone: The Southwest Hsüehshan Range, Central Taiwan</strong></p> <p><strong><em>Abstract — </em></strong>The southwest flank of the Hsüehshan Range is defined by a topographic break which cuts across regionally mapped structures in central …
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Transform Faults, Fracture Zones, and the Kinematics of Horizontal Thermal Contraction of Oceanic Lithosphere
… lithosphere between the Rivera and the Heezen fracture zones to calculate the predicted intraplate relative velocity field due to horizontal thermal contraction. For the kinematic assumption that balances net contraction and extension across the fracture zones, young oceanic lithosphere along …
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Application of Seasat altimetry to tectonic studies of fracture zones in the Southern oceans
… the intermediate-wavelength anomalies across the fracture zones. The shorter wavelength anomalies are consistent with those calculated from topography using elastic plate compensation. The combined effect of the thermal offset and seafloor topography produces an anomaly which has a …
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Seismic scattering attributes to estimate reservoir fracture density : a numerical modeling study
… to generate synthetic seismograms from a simple fractured reservoir containing evenly-spaced, discrete, vertical fracture zones. The fracture zones are represented using a single column of anisotropic grid points. In our experiments, we vary the spacing of the fracture zones from 10-meters to …
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Abyssal benthonic foraminifera and the carbonate saturation of sea water and a benthonic foraminferal carbonate saturation history for the Cape Verde Basin for the last 550,000 years
… dense water into the eastern Atlantic are the fracture zones on the ridge such as the Romanche, Chain ema Fracture Zones. The carbonate saturation of the Cape Verde Basin is very snsitive to the hydrography at these sill depths in the western Atlantic. The four cores studied range from …
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An analysis of the morphology and volcano-tectonic structure of the Central Indian Ridge between 18º and 21ºS
… ridge axis. Analysis of the data shows that the fracture zones have a significant structural control on along-axis morphology and melt supply, partitioning the ridge into three morphologically defined regions. The central region (Region B) bounded by two of the fracture zones, contains segments …
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A 3D Analysis of the Indo-Australian Slab Subducting Beneath Sumatra
… spreading ridge offset by north-south trending fracture zones. Currently, the subducted plate geometry is not well-constrained and is debated between authors. This study models the geometry and spatial extent of the subducted Indo-Australian plate utilizing tomography including recent local …
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Subsurface Structure, Stratigraphy, and Hydrocarbon Basin Modeling of the Barbados Accretionary Prism
… to the front of the prism and dammed by fracture zone ridges on the subducting, Atlantic plate. In Chapter 2, I evaluate the along-strike changes in the BAP as a response to oblique subduction of the two, elongated, fracture zones in oceanic crust (Tiburon Rise and Barracuda Ridge). …
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Geothermal systems in the Chalk of the south east of England: methods of predicting thermal transport in a fractured aquifer
… by as much as 10°C, will interact with the fractured Chalk aquifer in both the short and long term. An analytical solution developed by Bodvarsson (1989) was used to show that, for most configurations of a geothermal system, thermal transport would be governed by fractures. It was then …
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Influência da Zona de Fratura Romanche na evolução tectono-sedimentar do setor central da Margem Equatorial Brasileira
… study investigates the influence of the Romanche Fracture Zone on the tectono-sedimentary evolution of the Barreirinhas Basin, located in the central sector of the Brazilian Equatorial Margin and Guina. Based on integrated analysis of five seismic sections and three exploratory well, structures …
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Geochemistry and mineralogy of selected Atlantic Ocean basalts
… at 36°49 'N (FAMOUS), from the Islas Orcadas fracture zone on the Southwest Indian Ocean Ridge, from the Conrad fracture zone on the America-Antarctica Ridge and from Bouvet Island, situated at the southernmost tip of the Mid- Atlantic Ridge and in the vicinity of both the fracture zones …
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The effect of a shallow low viscosity zone on mantle convection and its expression at the surface of the earth
… the plate: mid-plate swells, the evolution of fracture zones, the mean depth and heat flow relationships with age and the observation of small scale (150-250 km) geoid and topography anomalies in the Central Pacific and Indian oceans. Convective models are presented of the formation and …
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The effect of a shallow low viscosity zone on mantle convection and its expression at the surface of the earth
… the plate: mid-plate swells, the evolution of fracture zones, the mean depth and heat flow relationships with age and the observation of small scale (150-250 km) geoid and topography anomalies in the Central Pacific and Indian oceans. Convective models are presented of the formation and …
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Is the Indian Ocean MOC driven by internal wave breaking?
… closed by hydraulic turbulence in the numerous Fracture Zones in the Indian Ocean.
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Faults and fractures in the Niobrara Formation of Wattenberg field, Colorado
… a reservoir and create associated fractures that can profoundly influence fluid flow in the reservoir. This investigation describes details of the fault regime in a portion of the Wattenberg Field, Colorado. For the purposes of this study, seismic-scale faults are interpreted as …
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Analysis and interpretation of clustered microseismicity at geothermal and petroleum reservoirs
… was induced during a controlled hydraulic fracture experiment conducted by Atlantic Richfield Corporation (ARCO). The other three clusters occurred near geothermal fields in western Italy during condensate reinjection. Analysis of events induced during ARCO's Deep Well Treatment and …
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Defining Stress Changes Ahead of a Tunnel Face and Design of a Data Acquisition System
… can relate to anomalies in the rock such as fracture zones and highly concentrated stresses. In order to develop a relationship between stress and elastic wave velocity, laboratory tests in a controlled environment are required. In the current study tomographic tests were conducted on Berea …
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The isotope geochemistry of abyssal peridotites and related rocks
… geomorphology, and analysis of the tectonics of fracture zones. The first chapter is an introduction to the problems to be addressed in this work. The second chapter examines the composition of basalts erupted near the Atlantis II Fracture Zone on the Southwest Indian Ridge. Trends in major …
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Rotating gravity current and channel flows
… through straits, mid ocean ridge valleys and fracture zones, and intermittent gravity currents. In the theoretical study two extensions are achieved to the energy conserving theory of Hacker (1996). Hacker considered three flow geometries, case A - weak rotation, case B - intermediate rotation …
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