Doctoral Dissertations

Abstract

"Seismology is a scientific discipline that utilizes seismic waves to investigate the deep structures within the Earth's interior, which are otherwise inaccessible to direct observation by humans. These seismic waves can be categorized into two types: body waves and surface waves, each with distinct propagation modes and behaviors, carrying valuable information about their travel paths. The first paper concentrates on the analysis and inversion of body waves produced by large seismic events. It employs shear wave splitting and receiver function methods to explore the geodynamic structure of the south-central Tibetan Plateau, near the plate boundary. The investigation covers the depth range from the crust to the upper mantle, yielding a three-dimensional plate tearing model to elucidate the observed weak anisotropy in the southern region and the variable anisotropy in the northern region. The second paper utilizes surface waves, which include ambient noise from anthropogenic sources or micro-natural events, to study the crustal velocity structure below the Yellowstone caldera, which formed approximately 0.53 million years ago. Tomography results reveal the presence of low-velocity anomaly zones within and surrounding the caldera. Through a comparative analysis of Green's functions spanning 40 days and 13 years, we constructed seismic velocity perturbation diagrams over time. Notably, we observed pronounced annual periodicity in the velocity profiles of Norris Geyser Basin, Hot Spring Basin, and Jackson Lake in the vicinity of the caldera. These cyclic variations were found to be primarily driven by meteorological factors, as elucidated by corresponding meteorological data" -- Abstract, p. iv

Advisor(s)

Liu, Kelly H.
Gao, Stephen S.

Committee Member(s)

Sherizadeh, Taghi
Locmelis, Marek
Yin, Xingyao

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geology and Geophysics

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2024

Pagination

xii, 131 pagees

Note about bibliography

Includes_bibliographical_references_(pages 76, 118 & 128-129)

Rights

©2024 Cong Shen , All Rights Reserved

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12411

Electronic OCLC #

1478135286

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