Arid
DOI10.1029/2018JB016269
Tomography of Southern California Via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity From Ambient Noise Cross-Correlations
Berg, E. M.1; Lin, F. -C.1; Allam, A.1; Qiu, H.2; Shen, W.3; Ben-Zion, Y.2
通讯作者Berg, E. M.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
EISSN2169-9356
出版年2018
卷号123期号:11页码:9933-9949
英文摘要

A self-consistent regional-scale seismic velocity model with resolution from seismogenic depth to the surface is crucial for seismic hazard assessment. Though Southern California is the most seismically imaged region in the world, techniques with high near-surface sensitivity have been applied only in disparate local areas and have not been incorporated into a unified model with deeper resolution. In the present work, we obtain isotropic values for Rayleigh wave phase velocity and ellipticity in Southern California by cross-correlating daily time series from the year 2015 across 315 regional stations in period ranges 6 to 18s. Leveraging the complementary sensitivity of the two Rayleigh wave data sets, we combine H/V and phase velocity measurements to determine a new 3-D shear velocity model in a Bayesian joint inversion framework. The new model has greatly improved shallow resolution compared to the Southern California Earthquake Center CVMS4.26 reference model. Well-known large-scale features common to previous studies are resolved, including velocity contrasts across the San Andreas, San Jacinto, Garlock, and Elsinore faults, midcrustal high-velocity structure beneath the Mojave Desert, and shallow Moho beneath the Salton Trough. Other prominent features that have previously only been imaged in focused local studies include the correct sedimentary thickness of the southern Central Valley, fold structure of the Ventura and Oak Ridge Anticlines, and velocity contrast across the Newport-Inglewood fault. The new shallow structure will greatly impact simulation-based studies of seismic hazard, especially in the near-surface low-velocity zones beneath densely populated areas like the Los Angeles, San Bernardino, and Ventura Basins.


英文关键词Rayleigh waves seismic imaging H V Bayesian Markov Chain Monte Carlo Southern California
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000454775200049
WOS关键词LOS-ANGELES BASIN ; WESTERN UNITED-STATES ; JACINTO FAULT ZONE ; CRUSTAL STRUCTURE ; PENINSULAR RANGES ; SALTON TROUGH ; SIERRA-NEVADA ; RECEIVER FUNCTIONS ; SEISMIC HAZARD ; MOJAVE-DESERT
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/211023
作者单位1.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA;
2.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA USA;
3.SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
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Berg, E. M.,Lin, F. -C.,Allam, A.,et al. Tomography of Southern California Via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity From Ambient Noise Cross-Correlations[J],2018,123(11):9933-9949.
APA Berg, E. M.,Lin, F. -C.,Allam, A.,Qiu, H.,Shen, W.,&Ben-Zion, Y..(2018).Tomography of Southern California Via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity From Ambient Noise Cross-Correlations.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(11),9933-9949.
MLA Berg, E. M.,et al."Tomography of Southern California Via Bayesian Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity From Ambient Noise Cross-Correlations".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.11(2018):9933-9949.
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