Date of Award
Master of Science
Charles A. Langston
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.
dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Shahjouei, Alireza, "Time Stability of Horizontal-to-vertical Ratio Ambient Noise in the Mississippi Embayment" (2015). Electronic Theses and Dissertations. 1202.