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Determining subsurface structure fro...

Folger, Derek Scott.

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Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys./
Author:	Folger, Derek Scott.
Description:	64 p.
Notes:	Advisers: Aaron A. Velasco; Diane I. Doser.
Contained By:	Masters Abstracts International44-05.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1434289
ISBN:	9780542632594

Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys.
Folger, Derek Scott.

Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys. - 64 p.

Advisers: Aaron A. Velasco; Diane I. Doser.

Thesis (M.S.)--The University of Texas at El Paso, 2006.

The amount of damage to a structure during an earthquake is related to the ground motion at that site. However, different types of rock and sediment react differently to seismic waves. Some units will have a tendency to amplify seismic energy while other units will attenuate energy. Therefore, it is important to study seismic waves that propagate through specific soil types to understand site response. Active seismic surveys are susceptible to noise interference and are limited due to spatial need, while boreholes are costly. I have applied a new method using a passive array to study Rayleigh waves from microtremors, waves originating from building appliances, cars, pedestrians walking, etc. Instead of using sines and cosines to estimate the signal, as in traditional Fourier transform analysis, I have developed a technique using a wavelet transform process to analyze the signal. The array was located in Rio Bosque Park east of El Paso, TX to image river sediments deposited by the Rio Grande River. By using everyday noises as the source, site-specific analysis can be performed in urban areas without worrying about noise interference or disturbing the public with explosions or other loud active sources. I compared results from the passive array to active seismic refraction data and data collected from a water well, including downhole seismic surveys and natural gamma, magnetic susceptibility, resistivity, and caliper logs. Results from all surveys show three distinct velocity layers: 150 m/s for 0-10 m depth, 200 m/s for 10-20 m depth, and 400 m/s for 20-50 m depth. The consistent results between the passive array and the ground truth model validate my approach of using passive noise to analyze the subsurface for earthquake hazard mapping.

ISBN: 9780542632594Subjects--Topical Terms:

516570
Geology.

Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys.
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005 20110915
008 110915s2006 eng d
020 $a 9780542632594
035 $a (UnM)AAI1434289
035 $a AAI1434289
040 $a UnM $c UnM
100 1 $a Folger, Derek Scott. $3 1291088
245 1 0 $a Determining subsurface structure from microtremors using passive arrays: An alternative to active seismic surveys.
300 $a 64 p.
500 $a Advisers: Aaron A. Velasco; Diane I. Doser.
500 $a Source: Masters Abstracts International, Volume: 44-05, page: 2250.
502 $a Thesis (M.S.)--The University of Texas at El Paso, 2006.
520 $a The amount of damage to a structure during an earthquake is related to the ground motion at that site. However, different types of rock and sediment react differently to seismic waves. Some units will have a tendency to amplify seismic energy while other units will attenuate energy. Therefore, it is important to study seismic waves that propagate through specific soil types to understand site response. Active seismic surveys are susceptible to noise interference and are limited due to spatial need, while boreholes are costly. I have applied a new method using a passive array to study Rayleigh waves from microtremors, waves originating from building appliances, cars, pedestrians walking, etc. Instead of using sines and cosines to estimate the signal, as in traditional Fourier transform analysis, I have developed a technique using a wavelet transform process to analyze the signal. The array was located in Rio Bosque Park east of El Paso, TX to image river sediments deposited by the Rio Grande River. By using everyday noises as the source, site-specific analysis can be performed in urban areas without worrying about noise interference or disturbing the public with explosions or other loud active sources. I compared results from the passive array to active seismic refraction data and data collected from a water well, including downhole seismic surveys and natural gamma, magnetic susceptibility, resistivity, and caliper logs. Results from all surveys show three distinct velocity layers: 150 m/s for 0-10 m depth, 200 m/s for 10-20 m depth, and 400 m/s for 20-50 m depth. The consistent results between the passive array and the ground truth model validate my approach of using passive noise to analyze the subsurface for earthquake hazard mapping.
590 $a School code: 0459.
650 4 $a Geology. $3 516570
650 4 $a Geophysics. $3 535228
690 $a 0372
690 $a 0373
710 2 0 $a The University of Texas at El Paso. $3 1057446
773 0 $t Masters Abstracts International $g 44-05.
790 $a 0459
790 1 0 $a Doser, Diane I., $e advisor
790 1 0 $a Velasco, Aaron A., $e advisor
791 $a M.S.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1434289