On information to establish preference between isotropic and transversely isotropic inner core models

Mifflen-Mitchell, Luke (2015) On information to establish preference between isotropic and transversely isotropic inner core models. Masters thesis, Memorial University of Newfoundland.

[img] [English] PDF - Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

Download (2285Kb)

Abstract

Forward modelling of traveltimes from an inner core with elliptical velocity dependence was performed, followed by inverse modelling based on both isotropic and elliptically anisotropic (transverse isotropic) traveltimes. The Kolmogorov-Smirnov (KS) test and Bayesian Information Criterion (BIC) were used for establishing model preference. BIC is a more robust method for studying anisotropy. If we start with an anisotropic model and a large variance of error (+/- 4%), with enough sampling of the anisotropy, even in the case of relatively few traveltimes measurements BIC is able to choose correctly the more complicated model as the preferred source model. It was determined that the KS test is unsuitable for studying inner core anisotropy but may be useful for studying anisotropy in exploration geophysical methods such as vertical seismic profiling.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/11607
Item ID: 11607
Additional Information: Includes bibliographical references (pages 38-40).
Keywords: Geophysics, Anisotropy, BIC
Department(s): Science, Faculty of > Earth Sciences
Date: August 2015
Date Type: Submission
Library of Congress Subject Heading: Seismic traveltime inversion; Anisotropy; Seismic waves--Speed; Earth (Planet)--Core--Mathematical models; Bayesian statistical decision theory

Actions (login required)

View Item View Item

Downloads

Downloads per month over the past year

View more statistics