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 6 of 6 for “"SS Precursors"”.
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Seismic Imaging of the Global Asthenosphere using SS Precursors
… remains poorly understood. In this dissertation, twelve years of SS precursors reflected off the top and bottom of the asthenosphere, namely, the LAB and the 220-km discontinuity, are processed to investigate the boundaries of the asthenosphere at a global scale. Finite-frequency …
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Imaging of crust and mantle structures with teleseismic reflected waves
… developed virtual deep seismic sounding (VDSS) to probe the Moho and we used SS precursors to study mantle transition zone discontinuities. To extend the applicability of VDSS, we developed a source deconvolution scheme to remove complex source signatures of shallow earthquakes. Application …
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Probing the Mantle Transition Zone beneath the Central Pacific Region Using PP Precursors
… phase transitions of olivine. The temperature-pressure relationships of phase transitions at the discontinuities, resulting in changes in seismic properties, make the MTZ a robust indicator of the mantle’s thermal and chemical conditions. With the hypothesis of an existing mantle plume under the …
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Seismic structure of the mantle beneath the Pacific Hemisphere
… the Earth's mantle is a region that is inaccessible directly, leaving us with limited tools to investigate its characteristics indirectly. Seismology is a tool well-suited for this purpose, and has provided valuable insight regarding many fundamental processes occurring within the mantle. It …
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Global Structure of the Mantle Transition Zone Discontinuities and Site Response Effects in the Atlantic and Gulf Coastal Plain
… on thermal structures and dynamic processes in the mid mantle. In this thesis, global topographic structures of the 410- and 660-km discontinuities are obtained from finite-frequency tomography of SS precursors. The finite-frequency sensitivities of SS waves and precursors are calculated …
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Seismic imaging of the mantle transition zone
… we developed a generalized Radon transform of SS precursors for large-scale, high-resolution seismo-stratigraphy of the upper mantle transition zone. The generalized Radon transform (GRT) is based on the single scattering approximation and maps singularities (reflections) in broad-band data …