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 27 for “"high-resolution seismic"”.
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Improved high-resolution seismic profiling.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. M.S.
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Modeling the Near-Surface Using High-Resolution Seismic Data
… the near-surface represents a major challenge in seismic exploration. For accurate deep subsurface reservoir imaging, an accurate near-surface velocity model is required. In this dissertation, I review the regional geology and geomorphology and the existing methods used for velocity modeling. A …
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Derivation of Acoustic and Physical Properties from High-Resolution Seismic Reflection Data
… properties. This thesis develops methods using high-resolution marine seismic reflection data to generate accurate, precise, and repeatable estimations of the in situ seismic quality factor (Q) and velocity, within the uppermost 100 m of unconsolidated marine sediments. This was achieved using a …
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High-Resolution Seismic Characterization of Shallow Sedimentary Structure for Freshwater Resources and Karstic Voids
… encompasses a comprehensive exploration of seismic source evaluation, high-resolution characterization of near-surface coastal sediments, and the development of novel methodologies for subsurface void detection. The research integrates various geophysical measurements and numerical modeling …
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Determination of Heterogeneity by High-Resolution Seismic Reservoir Characterization in the Heavy Oil Temblor Reservoir of Coalinga Field, California
… rocks on steam-affected 3D poststack seismic data, merged from different vintages, from the Temblor Formation in the Coalinga heavy oil reservoir in the San Joaquin basin, California. The objective was identification, delineation, and demarcation of reservoir heterogeneities by …
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Detection of a Landslide Glide Plane Using Seismic Reflection Methods: Investigation at Little Valley Landslide in Draper, Utah
… of boreholes. Geophysical methods, in particular high-resolution seismic data, were used to provide a framework for interpreting the geotechnical observations. High-resolution seismic reflection data, seldom used in landslide investigations, were acquired and processed in order to image the basal …
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An Approach to Mapping of Shallow Petroleum Reservoirs Using Integrated Conventional 3D and Shallow P- and SH-Wave Seismic Reflection Methods at Teapot Dome Field in Casper, Wyoming
… Wyoming, USA as a test case, we demonstrate how high-resolution compressional (P) and horizontally polarized shear (SH) wave seismic reflection surveys can overcome the limitations of conventional 3D seismic data in resolving small-scale structures in the very shallow subsurface (< 100-200 m …
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Seismic Studies of the East African Rift System and the Tibetan Plateau: Implications for the Rheology of Lithosphere and the Evolution of Rifts in Continents
… Mountains, and southern Tibet (near Xigaze). High-resolution seismic waveforms show that some focal depths exceeded 100 km, indicating that these earthquakes also occurred in the mantle lithosphere, even though the crust has been greatly thickened.
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North-south variations in structure, topography, and melting regime along the ultra-slow spreading Red Sea Ridge
… ridge superimposed on the Afar plume. Based on high-resolution seismic data, the southernmost (south of the Danakil rift at 17.05°N), southern (17.05-19.75°N), and central (19.75-23.8°N) segments display seafloor spreading that is anomalously magma-rich compared to other ultra-slow spreading …
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Constraints on mantle convection from seismic tomography and flow modeling
In this thesis I combine high resolution seismic tomography and realistic flow modeling to constrain mantle convection. The bulk of the data used in the tomographic imaging are millions of P, pP and pwP travel time residuals, read from high frequency seismic records. The distribution of earthquakes …
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Evaluating Late Pleistocene and Holocene Rupture, Seismic Hazards and Ground Motion in the Lake Tahoe Basin
… LiDAR (Light Detection and Ranging) imagery, high-resolution seismic CHIRP profiles, multibeam bathymetric mapping, and field mapping. The combined lateral and vertical resolution has allowed a straight forward identification of the landward extension of fault scarps associated with the three …
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Evolution of upper mantle beneath East Asia and the Tibetan Plateau from P-wave tomography
… East Asia and the Tibetan Plateau through high resolution P-wave tomography. The approach to high resolution tomography is based on (i) the combined use of a large range of different types of seismic data, (ii) the use of approximate finite frequency sensitivity kernels to account for …
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New Approaches In Hydrogeophysical Model Predictions: Case Studies From theP Reactor Area, Savannah River Site, South Carolina
… borehole ground penetrating radar (GPR), P-wave seismic reflection, and electrical resistivity tomography (ERT) data collected at a contaminant site located in the vicinity of the P Reactor at Savannah River Site, South Carolina. These near-surface geophysical methods provide information at …
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Tectonic and magmatic processes during extension in planetary lithospheres : rifting, spreading, delamination, and recycling on Earth and Venus
… diverge in their evolutionary pathways and highlights the importance of developing a theoretical framework for the origins of planetary diversity. A key aspect of planetary tectonic systems is how the lithosphere responds to driving forces such as the upwelling or downwelling of material in …
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A Conceptual Model of Groundwater Flow at the Midway, Utah Fish Hatchery as Constrained by Geochemical, Physical Hydrogeological, and Geophysical Methods
… with ancient hydrothermal water, relatively high TDS, and relatively enriched isotopic values. The confined aquifers have a smaller hydrothermal component, relatively depleted isotopic values, lower TDS, and modern recharge components. Two orthogonal shallow high-resolution seismic reflection …
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Evolution of Late Cenozoic Minibasins and Growth Faulting, Green Canyon Area, Northwestern Gulf of Mexico
… shelf edge. The presence of salt welds on many seismic profiles indicates that high rates of sedimentation during the Pliocene and Pleistocene likely caused mobilization and complete evacuation of an allochthonous Miocene salt sheet. This movement is interpreted to have caused the formation of …
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Ambient seismic noise tomography of the southern United States and seismic inversion with dictionary learning using unsupervised machine learning.
Seismic tomography and inversion are well-established methods to understand deep subsurface structures. These techniques are particularly effective in delineating complex crustal architectures, which often deviate from simplified textbook models. High-resolution seismic tomography enables the …
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Seismic imaging of the western Hellenic subduction zone : the relationship between slab composition, retreat rate, and overriding lithosphere genesis
… Zone (WHSZ) by using two complementary seismic imaging methods and interpreting the resulting images with models that describe the dynamics of retreating subduction. First, I produce high-resolution seismic images across northern and southern Greece using a two-dimensional teleseismic …
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High resolution seismology, archaeology and submerged landscapes - an interdisciplinary study
… potential for post-survey signal enhancement of high-frequency seismic data. Investigation into the characteristics of commercial Chirp and Boomer seismic indicates that Chirp systems offer superior repeatability and vertical resolution, making possible development of a rapid, robust processing …
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