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 20 for “"Gouge"”.
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Grain Growth and mechanical processes in two-phased synthetic marbles and natural fault gouge
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Study of fault gouge influences on mechanical and frictional behavior of granular shear zones using the distinct element method
Studies of fault gouge and its role in shear zone deformation are the key to understanding the mechanics of earthquakes and fault zone evolution. With the advantage of exploring the micromechanical process of gouge deformation in "real time", the combination of the Distinct Element Method (DEM) and …
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Understanding Magnetic Flux Leakage from Gouges and Dents Containing Gouges
… and recently began considering MFL signals from gouges, and gouge/dent combinations. It is believed that MFL signals from gouges may arise from three factors: the gouge geometry, residual stresses, and a severe plastically deformed layer that is often present at the base of the gouge. The last …
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In Situ Compressional Wave Velocity Across An Exposed Brittle Fault Zone
The effects of lithology, fracturing, and gouge zone mineralization on the geophysical properties of fault zones are not very well understood. In situ seismic data collected over the exhumed San Gregorio Fault at Moss Beach, CA were used to relate in situ compressional wave velocity to internal …
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Developing a Self-Powered, Wireless Damage Detection System for Structural Health Monitoring Applications
… impedance-based technique is used to detect a gouge introduced to a composite plate. The second technique is a modal parameter technique that analyzes shifts in natural frequency; this technique was used to detect structural changes in an aluminum cantilever beam. In additional to the above …
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Localization and instability in sheared granular materials: role of friction and vibration
… triggering, quiescence and strength evolution in gouge filled fault zones.
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A 3D fault seal analysis study conducted in the Ibhubesi Gas Field Offshore the West Coast of South Africa
… fault. Fault clay was determined using the Shale Gouge Ratio (SGR) algorithm and permeability and threshold pressure were also used to quantify the fault seal capacity. The results from the SGR were correlated to the across fault pressure difference and plotted on a reference diagram which is a …
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The Saltville thrust: investigation of a regional thrust fault in a foreland fold and thrust belt
… within a layer of cataclastically flowing gouge. Thin fault zones and rapid decreases in deformation intensity away from the fault surface indicate rapid sliding, and a lack of frictional grinding.
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Securing Multi-Layer Federated Learning: Detecting and Mitigating Adversarial Attacks
Within the realm of federated learning (FL), adversarial entities can poison models, slowing down or destroying the FL training process. Therefore, attack prevention and mitigation are crucial for FL. Real-world scenarios may necessitate additional separation or abstraction between clients and …
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The onset of gouging in high-speed sliding contacts
… analyzing rail microstructural evolution during gouge onset. A previous gouging model based on shock mechanics was extended, while other models based on mechanisms such as Rayleigh waves, bending waves, and shear band formation were ruled out. An effective Reynolds number approach from explosive …
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Geologic setting, Mineralization, and Detailed Underground Mapping of the Fire Creek Low-Sulfidation Epithermal Gold-Silver Deposit, Nevada
… with intense argillic alteration, fault gouge, and abundant sulfides. This refractory and somewhat disseminated ore known as Type II ore primarily occurs along faults, and to a lesser extent along subvertical dike margins and subhorizontal vesicular lava flow tops. This mineralization, …
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A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa
… properties supported this view, with the Shale Gouge Ratio (SGR) and threshold pressure relationship indicating a high likelihood for leakage across parts the faults. Pressure data from Repeat Formation Tests (RFT) however, indicates that the hydrocarbon accumulations in both blocks are isolated …
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Temperament-Language Relationships during the First Formal Year of School.
<p>The purpose of the current study was to investigate temperament-language relationships among school-age children and across a wider variety of SES. Head Start, Pre-K, and Kindergarten classes of 10 elementary schools located in rural Appalachia were sent information about the study and 35 …
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An Economic Evaluation of Primary Care Behavioral Health in Pediatrics: A Case Study
<p>A barrier cited by primary care administrators in integrating behavioral health is financial risk. Fee-for-service billing mechanisms remain complex and there is little empirical guidance on cost-effective models. This study was an economic evaluation of an integrated care model in a pediatric …
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Ore Types And Fluid Regimes: Macassa Gold Mine, Kirkland Lake
… Macassa Mine: (1) native Au in chloritic fault gouge or small quartz lenses within a prominent, subvertical, thrust-fault system. This is called Break ore. (2) gold-bearing quartz veins in both hanging and footwalls of this fault system. This is called Vein ore. (3) several zones in the deep …
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Faulting, sedimentation and fluid flow at the basin margin : the north Solway fault
… The textures within fault rocks such as gouge and breccias are shown to give an indication of the mechanical state of the fault at the time of deformation. Contrasting fault zone internal structures are observed where the fault is interpreted to be the result of either basement-basement …
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Laboratory analysis of restrenghtening on simulated faults
… rock surfaces, and healing of simulated fault gouge under a range of physico-chemical conditions. We have performed experiments to investigate the repetitive stick-slip behavior of initially bare granite surfaces (nominal contact area 25 cm2). The tests were conducted in a double-direct shear …
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Constitutive equations for granular materials : application to dry sand and powder metal
… shear" in the shearing experiment of a simulated gouge layer (Marone et al., 1990,1999) has been captured in our simulations. This physically based constitutive model is also able to predict the startling "stress dip" in a static sandpile - the vertical stress is not maximum under the apex of the …
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Modeling CO₂ leakage from geological storage formation and reducing the associated risk
… field data in the Mahogany Field using a shale gouge ratio correlation. The estimated worst-case CO₂ flux is slightly above background range. The flux along fault could be attenuated to zero by permeable layers that intersect the fault. The attenuation is temporary if layers are sealed at other …
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Linking Subsurface Paleofluid Flow Events to Tectonics and Basin Evolution using Geochronology: Examples from the Paradox Basin
… analysis (IAA) and Rb-Sr geochronology on fault gouge clay, with K-Ar IAA on authigenic clay associated with red bed bleaching and Re- 15 Os geochronology on copper sulfides. I produced statistically overlapping K-Ar and Rb-Sr dates of authigenic illite from six faults across the Paradox Basin …