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 28 for “"Seismic wave propagation"”.
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Numerical Methods in Seismic Wave Propagation
The numerical modelling of wave equations is a common theme in many seismic applications, and is an important tool in understanding how the physical systems of interest react in the process of a seismic experiment. In this thesis we apply state-of-the-art numerical methods based on …
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Seismic wave propagation in and around boreholes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Seismic wave propagation in a two-layer half-space
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1956.
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Finite difference seismic wave propagation using variable grid sizes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Finite Element Modeling of Seismic Wave Propagation in Earthen Embankments
… in embankments (dams and levees) by geophysical seismic techniques such as seismic refraction is limited by a number of factors. Some factors are associated with inversion and smoothing problems during processing, while others are associated with the natural characteristics of embankments and …
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Seismic wave propagation in thinly-layered media with steep reflectors
Includes bibliographical references.
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Seismic wave-propagation in a layer over a half-space,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Seismic-wave propagation in two-phase media and its application to the earth's interior
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Geometry assessment and strength/stiffness monitoring of lime and cement modified soils via characterization of curing-induced property changes estimated from seismic wave propagation techniques and electrical resistivity
… temperature conditions. This research employs wave propagation techniques to monitor the strength/stiffness growth of lime/cement stabilized subgrade and formulates a maturity function to predict modulus growth as a simultaneous function of both time and temperature. The maturity function is …
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A computational framework for the solution of infinite-dimensional Bayesian statistical inverse problems with application to global seismic inversion
… the entire framework to a problem in global seismic wave propagation. Classical (deterministic) approaches to solving inverse problems attempt to recover the “best-fit” parameters that match given observation data, as measured in a particular metric. In the statistical inverse problem, we go …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… past 80 My. The second study uses multichannel seismic reflection data to constrain the location and depth of axial magma chambers at the Endeavour Segment of the Juan de Fuca spreading ridge, and then correlates these magma chamber locations with features of the hydrothermal heat extraction …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… past 80 My. The second study uses multichannel seismic reflection data to constrain the location and depth of axial magma chambers at the Endeavour Segment of the Juan de Fuca spreading ridge, and then correlates these magma chamber locations with features of the hydrothermal heat extraction …
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Wavefront Healing and Tomographic Resolution of Mantle Plumes
To investigate seismic resolution of deep mantle plumes as well as the robustness of the anti-correlation between bulk sound speed and S wave speed imaged in the lowermost mantle, we use a Spectral Element Method (SEM) to simulate global seismic wave propagation in 3-D wavespeed models and measure …
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Seismic wave modelling using finite difference methods
… numerical approach to model numerically seismic wave propagation, and also to ascertain if rock interfaces could be inferred from signals received at a geophone.<br/><br/>We mainly employ two different models together, namely the "Parsimonious staggered grid" and the "Box" model. So far …
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Sparse seismic signal processing using adaptive dictionaries
Seismic surveys have become the primary measurement tool of exploration geophysics, both onshore and offshore, with significant signal processing needed to estimate the properties of earth subsurface via seismic wave propagation. The typical workflow for seismic includes three phases: acquisition, …
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Attenuation of volcanic seismic signals
… is believed to consist of dispersive interface waves, trapped at the fluid-solid boundaries. The amplitude decay or attenuation of these earthquake signals can be decomposed into radiative and intrinsic components, and in this way yield information about both the geometry and fluid properties of …
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Acoustic full-waveform to elastic pre-stack seismic inversion of the Yakutat Terrane, Gulf of Alaska
… acoustic and isotropic time-domain full waveform inversion (FWI) of marine seismic reflection and refraction data from the STEEP project (ST. Elias Erosion/tectonics Project). FWI is a non-linear data-fitting algorithm that aims to recover subsurface parameters from the recorded seismic …
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Efficient simulation of challenging PDE problems on CPU and GPU clusters
… data and schemes. The first application is the wave propagation in optical fibers. We present an MPI-parallel implementation that is particularly suitable for small clusters. %Here, we change the numerical method and the implementation technique to increase efficiency and decrease runtime. The …
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Tensorial elastodynamics and acoustodynamics for generalized seismic migration and inversion applications
… inversion problems within the exploration, microseismic, and earthquake seismology communities. The main driver is the need to accurately model and reproduce full-wavefield solutions, which represent the main computational effort for such applications as elastic reverse-time migration (E-RTM) and …
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Viscoelastic full-waveform inversion: treating attenuation uncertainty, characterizing cross-talk, and quantifying confidence in inversion results
Full waveform inversion (FWI) is a powerful technique for estimating the subsurface properties which affect seismic wave propagation but it is often limited by simplistic treatment of wave propagation physics. In particular, attenuation and dispersion, which play major roles in most seismic …
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