Electronic Theses and Dissertations

Identifier

853

Date

2013

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geophysics

Committee Chair

Christine Powell

Committee Member

Robert Smalley

Committee Member

Mitchell Withers

Abstract

We present new 1-D and 3-D P- and S-wave velocity models for the active Charlevoix seismic zone (CSZ). The CSZ has generated several damaging earthquakes but the causative reason for the seismic activity in this intraplate region is unknown. Structure developed during prior tectonic events could be influencing present day seismic activity. Previous velocity models derived from local earthquake tomography utilize an overly simplistic half-space starting model. We develop improved 1-D P- and S-wave starting models using VELEST. These models contain several layers in the depth range 0 to 30 km and provide better starting models for 3-D inversion. Our new 3-D P- and S-wave velocity models contain several interesting anomalies that will provide insight into what factors influence earthquake occurrence in the CSZ. Relocated hypocenters outline the spatial extent of currently microseismically active seismogenic faults.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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