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 7 of 7 for “"Radial anisotropy"”.
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SEISMIC VELOCITY, RADIAL ANISOTROPY IN THE CRUST AND UPPER MANTLE OF NORTHEASTERN TIBETAN PLATEAU FROM SURFACE WAVE TOMOGRAPHY
… 20 to 91 s, and then used to construct a 3-D radial anisotropic model combined with the VSV model. The lower crust is characterized with positive anisotropy (VSH>VSV). The large positive anisotropy can be explained by horizontal alignment of anisotropic minerals such as mica at the formation …
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Seismic Velocity and Radial Anisotropy in the Crust and Upper Mantle of the South Central United States from Surface Wave Tomography
… Transportable Array. 3-D shear-wave velocity and radial anisotropy models were derived from the phase velocities for the Gulf Coast region from Texas to Alabama. In the shallow crust, low velocity appears in the coastal plain to the south of the Ouachita front due to thick sediments. In the middle …
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Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China
… Vsv and Vsh Their differences are measured as radial anisotropy. We then conduct Eikonal tomography to study azimuthal anisotropy in the crust. Our tomography results are well consistent with geology in the study region. In the Sichuan Basin, low wavespeed and positive radial anisotropy (Vsh> …
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Ambient seismic noise imaging using trans-dimensional and machine learning techniques with application to Borneo and Iceland
… with associated uncertainties, which allowed radial anisotropy to be measured. This model reveals a pronounced low Vs anomaly at 1-3 km depth beneath the caldera, which I interpret to be the signature of a shallow magma chamber. A positive radial anisotropy anomaly in the same location …
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Seismic structure of the mantle beneath the southwestern Pacific
… the mantle, perturbations to shearwave radial anisotropy in the uppermost mantle, and the topographies of the 410- and 660-km discontinuities. The model we obtained, which is well resolved in the upper mantle, exhibits high shear speeds at shallow depths and low speeds in the transition …
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Velocity and anisotropy structure of the Icelandic crust - An ambient seismic noise analysis
… tomographic imaging as well as azimuthal and radial anisotropy analyses in both the lower and upper crust. Understanding accretion and deformation processes at mid-ocean ridges is crucial because they control the resulting oceanic crustal structure, which covers two-thirds of the Earth’s …
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Structure and dynamics of the Pacific upper mantle
… of ground motion as phase delays relative to a radially-anisotropic, spherically-symmetric oceanic mantle model, and their 2D Fréchet kernels are constructed by a coupled-mode algorithm. The travel times of the primary ScSn and sScSn phases and their first-order reverberations from the 410 and …