Geophysics and Tectonics Seminar fall-2020

A fully non-linear transdimensional hierarchical Markov Chain Monte Carlo approach was developed and applied to fundamental and higher mode Love and Rayleigh wave dispersion data to constrain radial anisotropy in the Indian Ocean. We obtained three-dimensional tomographic models of shear-wave velocity and anisotropy with quantitative uncertainties down to the mantle transition zone. We compared these models to results from regularized linear inversions of the same data set obtained with and without prior constraints on 410- and 660-discontinuities topography. We found that the undulations of these discontinuities had little effect on the resulting models. We also compared results from non-linear joint and separate inversions of Love and Rayleigh waves and tested the effect of depth parametrization on the models.