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 80 for “"velocity structure"”.
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Crustal seismic velocity structure of the intermontane and coastal belts, southwestern Canadian Cordillera
… refraction program include; i) determining 2-D velocity structure and interrelationships of the component erranes, ii) defining the depth and configuration of the Mohorovic discontinuity, and iii) determining the extent of vertical displacement of major faults within the region. In particular, …
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Gulf Stream velocity structure through combined inversion of hydrographic and acoustic doppler data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.
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A study of the velocity structure in a marine boundary layer : instrumentation and observations
… fluctuating parts of the three components of the velocity vector at four heights above the sea bed. The sensors employ the acoustic travel time difference technique, and are designed to minimize sensor-induced flow disturbances. BASS, an acronym for Benthic Acoustic Stress Sensor, has a resolution …
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Crustal velocity structure in the southern coast belt, British Columbia, from a seismic refraction survey
… used to interpret crust and upper mantleP-wave velocity structure. The structural model features a thin (0.5 to 3.0 kin) near-surface layer with an average velocity of 4.40 km/s, a significant vertical velocity gradient and lateral variations. This uppermost stratum overlies a crustal velocity …
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Surface Wave Inversion of the Upper Mantle Velocity Structure in the Ross Sea Region, Western Antarctica
… This study focuses on the mantle seismic velocity structure of the West Antarctic Rift System in the Ross Embayment and adjacent craton and Transantarctic Mountains to further refine details of the velocity structure.</p> <p>Teleseismic events were selected to satisfy the two-station …
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Seismic Q and velocity structure for the magma-hydrothermal system of the Valles Caldera, New Mexico
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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Velocity Structure of the Subducting Nazca Plate beneath central Peru as inferred from Travel Time Anomalies
… Peru provide constraints on the geometry and velocity structure of the subducting Nazca plate. Hypocenters for these events, which are beneath the sub-andean and eastern Peruvian basins, were determined using a best-fitting onedimensional velocity-depth model with a 15-station …
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Upper-mantle velocity structure beneath the western Philippine Sea plate from body waves, surface waves, and SCS reverberations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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S-wave velocity structure beneath the Kaapvaal Craton from surface-wave inversions compared with estimates from mantle xenoliths
… to about 180km depth [James et al 2004]. Seismic velocity-depth and density-depth profiles calculated on the basis of these P-T data and the mineral modes of the xenoliths are used to produce theoretical surface-wave dispersion curves and to generate roughly the upper 200km of a starting/reference …
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Seismic studies of central Asia : some characteristics of earthquake mechanism and seismic wave velocity structure beneath the Tibetan plateau
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1979.
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Surface Wave Derived Shear Velocity Structure of the Gamburtsev Subglacial Mountains, Transantarctic Mountains, and West Antarctica and Shallow Seismicity of the Mariana and Tonga Subduction Zones
… interest we are able to better image the structure of these regions and place them in a global framework. This is particularly important in regions such as Antarctica and the ocean bottom where more traditional tools such as geologic mapping and sampling are difficult, if not currently …
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An exploration of the effect of anisotropy on seismic tomography in different geological settings
… is used in wide ranges to understand the inner structure of Earth based on the dependence of seismic velocity to temperature and other factors such as composition, volatile content, and seismic anisotropy. Despite it is well known that the mantle is seismically anisotropic, the isotropic mantle …
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Imaging the Soultz Enhanced Geothermal Reservoir using double-difference tomography and microseismic data
… tomography method to image the P and S-wave velocity structure of the European Hot Dry Rock geothermal reservoir (also known as the Soultz Enhanced Geothermal System) at Soultz-sous-Forets, France. We used absolute, differential catalog and differential cross-correlation times obtained from …
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Data adaptive velocity/depth spectra estimation in seismic wide angle reflection analysis
… seismics, one of the major unknowns is the velocity structure of the medium. Techniques used to determine the velocity structure commonly involve multi-channel arrays which measure the spatial as well as the time structure of the returning signals. The application of a data adaptive …
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A descriptive physical analysis of water movement in the South West African Indian Ocean during the Northeast monsoon season
… addition the detailed volume transport and the velocity structure for each vertical section were calculated. The results pointed to a significant variation in transport and velocity structure from year to year. The large scale circulation in depth of the ocean is described. It is found that the …
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Particle dispersion in isotropic turbulence and unsteady particle dynamics at finite Reynolds number
… The Basset force has no effect on the fluid velocity structure seen by the particles or the long-time particle diffusivities. It does affect the intensities of particle motion for particles with large settling rate and with response time comparable to the turbulence integral time scale.
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Structure of the Queen Charlotte Basin and underlying crust from modelling and inversion of three-dimensional seismic refraction data
… was carried out in 1988 to investigate the structure and tectonic evolution of the Queen Charlotte (QC) Basin and underlying crust off the northern coast of British Columbia. While the marine multichannel reflection data were being collected, refracted and wide-angle reflected energy from …
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Seismological structure of the Carpathian-Pannonian region of central Europe
… from teleseismic earthquakes, reveal the velocity structure of the mantle to a depth of 850 km throughout the Carpathian-Pannonian region. The tomographic models reduce the P-wave rms residual by 71% from 0.446 s to 0.130 s, and the S-wave rms residual by 59% from 1.513 s to 0.624 s. The …
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Teleseismic tomography beneath Hi-CLIMB station array in western Tibetan Plateau
This study aims to explore the velocity structure of the lithosphere and upper mantle beneath the Hi-climb station array in mid-western Tibetan Plateau (TP), thus to understand the deformation scheme of the Indian-Eurasian collision. The Hi-Climb seismic array, which includes 75 seismic stations, …
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