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High-resolution 3D shallow crustal structure in Long Beach, California: Application of ambient noise tomography on a dense seismic array

Lin, Fan-Chi and Li, Dunzhu and Clayton, Robert W. and Hollis, Dan (2013) High-resolution 3D shallow crustal structure in Long Beach, California: Application of ambient noise tomography on a dense seismic array. Geophysics, 78 (4). Q45-Q56. ISSN 0016-8033. https://resolver.caltech.edu/CaltechAUTHORS:20130909-085627813

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Abstract

Ambient noise tomography has proven to be effective in resolving shallow earth structure. We applied ambient noise tomography on a dense seismic array in Long Beach, California. The array was composed of more than 5200 stations with an average spacing close to 100 m. Three weeks of passive ambient noise were crosscorrelated between each station pair, which resulted in more than 13.5 million crosscorrelations within the area. Clear fundamental-mode Rayleigh waves were observed between 0.5 and 4 Hz, which were most sensitive to structure above 1-km depth. For each station pair, we applied frequency-time analysis to determine the phase traveltime dispersion, and, for each frequency, we applied eikonal tomography to determine the Rayleigh wave phase velocity map. The eikonal tomography accounted for ray bending by tracking the wavefront and allowed uncertainties to be estimated through statistical analysis. The compilation of phase velocity maps was then used to invert for 3D shear velocity structure. The inverted model showed clear correlation with the known geologic features such as the shallow south–north velocity dichotomy and a deeper fast anomaly associated with the Newport-Inglewood fault zone. Our results can potentially be used to complement traditional active source studies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1190/GEO2012-0453.1DOIArticle
http://library.seg.org/doi/abs/10.1190/geo2012-0453.1PublisherArticle
ORCID:
AuthorORCID
Lin, Fan-Chi0000-0003-0394-6830
Li, Dunzhu0000-0003-3149-0236
Clayton, Robert W.0000-0003-3323-3508
Additional Information:© 2013 Society of Exploration Geophysicists. Manuscript received by the Editor 26 October 2012; revised manuscript received 4 March 2013; published online 1 August 2013. The authors gratefully acknowledge NodalSeismic LLC and Signal Hill Petroleum, Inc., for permitting us to use the Long Beach data. We also thank K. Wapenaar, the associate editor, A. Verdel, and two anonymous reviewers for constructive comments and V. Tsai and C. Stork for helpful discussions.
Group:Seismological Laboratory
Subject Keywords:surface wave, shear wave (S-wave), tomography, 3D, noise
Issue or Number:4
Record Number:CaltechAUTHORS:20130909-085627813
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130909-085627813
Official Citation:Lin, F., Li, D., Clayton, R., and Hollis, D. (2013). ”High-resolution 3D shallow crustal structure in Long Beach, California: Application of ambient noise tomography on a dense seismic array.” GEOPHYSICS, 78(4), Q45–Q56. doi: 10.1190/geo2012-0453.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41159
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Sep 2013 20:47
Last Modified:09 Mar 2020 13:19

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