Electronic Theses and Dissertations

Identifier

6030

Yu Geng

Date

2017

Document Type

Thesis (Access Restricted)

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geophysics

Committee Chair

Jer-Ming Chiu

Committee Member

Robert Smalley

Committee Member

Mitch Withers

Abstract

Several groups of earthquake clusters were selected and relocated using the JHD method. Systematic horizontal and vertical hypocentral shifts were observed. An initial 3-D Vp and Vs model was implemented by modifying the original 1-D model to include the JHD station correction patterns obtained from the previous stage. The 3-D Vp and Vs velocity structures of the study region were investigated using selected data from two years’ catalog. Perturbations in the shallow part of the velocity model become larger mainly because of the inclusion of JHD station corrections in the initial model. All events in the selected catalog were relocated using the resultant 3-D model. Hypocentral shifts are in general very small compared to the dimensions of existing active faults in the Northeastern Japan, which means that the original catalog is surprisingly accurate even if a 1-D model was used for routine earthquake locations. Previous conclusions about on-going active tectonic processes would not change.

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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