Electronic Theses and Dissertations

Identifier

1420

Date

2015

Date of Award

7-20-2015

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geophysics

Committee Chair

Charles A. Langston

Committee Member

Christine Powell

Committee Member

Eunseo Choi

Abstract

The stability of the first and second peak frequencies of horizontal-to-vertical (H/V) power spectra over a two year deployment of a broadband array in the Mississippi embayment is evaluated to determine any changes in source of ambient noise that, in previous studies, have been attributed to Rayleigh wave propagation. Over 18220 estimates of H/V spectra are analyzed to estimate the peak frequencies with standard deviations. Results show that the average of first peak frequency that represents the fundamental resonance frequency of the sediment, and second peak frequency are 0.2582 and 0.6637 Hz, respectively. Considering 99% confidence interval, the first and second peaks are 0.2582±0.0047 and 0.6637±0.0012 Hz. There is no significant variation in either peak frequency over the two year time span although ambient ground motions for the second peak must have a different source than Rayleigh wave from the Atlantic seaboard or due to effects of multilayered sediment structure.

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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