Electronic Theses and Dissertations

Identifier

639

Date

2012

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geophysics

Committee Chair

Charles Adams Langston

Committee Member

Mitch Withers

Committee Member

Robert Smalley

Abstract

This study tests the effectiveness of the wave gradiomety array analysis technique in extracting the wave parameters from the borehole data. 80 3-component high-frequency borehole accelerometers were integrated in a tube and clamped along the wall of San Andreas Fault Observatory at Depth (SAFOD) main hole. Data were recorded from six shots of size 2.3 to 4.5 kg and several 36.3 kg pentolite explosives with the accelerometers at three different positions in the borehole. Wave gradiomety and travel time array analysis techniques were used to investigate the velocity structure around the SAFOD borehole. The results show that both techniques can be used for borehole data analysis with the observed exception that the travel time analysis exaggerates differences in P-wave velocity between adjacent layers. The P-wave velocity structure obtained from wave gradiomety and VSP have shown much similarity with some exceptions at the depth of 0.8 km and below 2.0 km. Wave gradiomety can be effectively used for borehole data analysis since the wave gradiomety results agreed well with the inferred borehole geology and well-logs.

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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