Modeling the Anisotropic Shear Wave Velocity Structure in the Earth's Mantle on Global and Regional Scales

Download or read book Modeling the Anisotropic Shear Wave Velocity Structure in the Earth's Mantle on Global and Regional Scales written by Bogdan Kustowski and published by . This book was released on 2007 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine large data sets of surface-wave phase anomalies, long-period waveforms, and body-wave travel times in order to provide new constraints on the anisotropic shear-wave velocity structure of the Earth's mantle. The waveform inversion is performed using a new and more accurate method developed to correct seismograms for non-linear crustal effects. Starting with an isotropic spherically symmetric earth model, we build a new one-dimensional, transversely isotropic reference model by independently constraining variations in five elastic parameters and density. Using this new reference model, we invert the data for a whole-mantle model of shear-wave velocity and investigate lateral anisotropic variations at all depths in the mantle. Finally, we develop a technique that allows us to calculate a high-resolution tomographic model of a specific region as a perturbation with respect to the low-resolution global model, and implement this technique to study the structure beneath Eurasia.