Publication Date

2019-08-02

Availability

Embargoed

Embargo Period

2021-08-01

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PHD)

Department

Marine Geology and Geophysics (Marine)

Date of Defense

2019-05-02

First Committee Member

Guoqing Lin

Second Committee Member

Falk Amelung

Third Committee Member

Keir Becker

Fourth Committee Member

Paul G. Okubo

Abstract

Highly concentrated seismicity is typically distributed in volcanic and geothermal areas due to either natural or anthropogenic activities. In this dissertation, I present two seismic projects in volcanic and geothermal areas: accommodation of the south flank’s motion by the Koa‘e fault system in Kīlauea volcano, Hawai‘i and spatiotemporal analysis of seismic anisotropy and its relationship with the anthropogenic activities in the Salton Sea geothermal field. In the project of the 2012 Koa‘e seismic sequence, I combine different geophysical analyses including precise seismic relocation, geodetic modeling, and the Coulomb stress change calculation and provide an explicit model of two faults in the central part of the Koa‘e fault system. The results show that a slow slip event might have triggered both seismic events and aseismic fault slip. In the seismic anisotropy study in the Salton Sea geothermal field, I apply the Multiple Filter Automatic Splitting Technique to all the available seismic data from 1988 to 2016 to calculate the orientation of the fast shear wave and delay time between the fast and slow shear waves. The measured direction of maximum horizontal stress can be helpful for monitoring the exploitation in the geothermal field.

Keywords

seismology; volcano; fault; geothermal; anisotropy

Available for download on Sunday, August 01, 2021

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