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SEISMIC VELOCITY CONTRAST ACROSS THE SAN JACINTO
FAULT, CALIFORNIA, FROM TRAVEL TIME MEASUREMENTS OF
AMBIENT NOISE CORRELATIONS
by
Wei Wang
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(GEOLOGICAL SCIENCES)
August 2011
Copyright 2011 Wei Wang
Object Description
| Title | Seismic velocity contrast across the San Jacinto fault, california, from travel time measurements of ambient noise correlations |
| Author | Wang, Wei |
| Author email | wang55@usc.edu;wwibicf@gmail.com |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Geological Sciences |
| School | College of Letters, Arts And Sciences |
| Date defended/completed | 2011-06-15 |
| Date submitted | 2011-07-18 |
| Date approved | 2011-07-19 |
| Restricted until | 2011-07-19 |
| Date published | 2011-07-19 |
| Advisor (committee chair) | Ben-Zion, Yehuda |
| Advisor (committee member) |
Sammis, Charles Miller, Meghan |
| Abstract | We analyze 2 years of continuous ambient noise data recorded at 24 broadband stations around the San Jacinto Fault Zone (SJFZ), California. Using similar techniques as Roux et al. (2005), we obtain noise-based cross-correlations in the frequency range 0.1-1.3 Hz in +/-50 seconds time windows across >200 station pairs with distances ranging from 2 to 130 km. To study the effect of seasonally varying noise sources on the resulting cross-correlations, we stack 3-months of data from winter and summer periods separately. The following two main arrivals are resolved independent of the season: (1) a Rayleigh wave travelling at ~3.2 km/s and (2) an arrival around t=0 likely resulting from teleseismic P-phase with near-vertical incidence. In addition, two phases travelling roughly at 6 km/s and 12 km/s appear during winter which are also attributed to teleseismic P-phases with high apparent velocities. Amplitudes in winter are stronger than in summer, reflecting the seasonally dependent energy content of noise in the microseisms frequency band. An approximate 3-6% velocity contrast across the SJFZ can be resolved from our analysis. |
| Keyword | cross-correlation; ambient noise; seasonal variance |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Wang, Wei |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume71/etd-WangWei-125.pdf |
Description
| Title | Page 1 |
| Full text | SEISMIC VELOCITY CONTRAST ACROSS THE SAN JACINTO FAULT, CALIFORNIA, FROM TRAVEL TIME MEASUREMENTS OF AMBIENT NOISE CORRELATIONS by Wei Wang A Thesis Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE (GEOLOGICAL SCIENCES) August 2011 Copyright 2011 Wei Wang |
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