Arid
DOI10.1785/0120090004
Detailed P- and S- Wave Velocity Models along the LARSE II Transect, Southern California
Murphy, Janice M.1; Fuis, Gary S.1; Ryberg, Trond2; Lutter, William J.3; Catchings, Rufus D.1; Goldman, Mark R.1
通讯作者Murphy, Janice M.
来源期刊BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
ISSN0037-1106
出版年2010
卷号100期号:6页码:3194-3212
英文摘要

Structural details of the crust determined from P-wave velocity models can be improved with S-wave velocity models, and S-wave velocities are needed for model-based predictions of strong ground motion in southern California. We picked P-and S-wave travel times for refracted phases from explosive-source shots of the Los Angeles Region Seismic Experiment, Phase II (LARSE II); we developed refraction velocity models from these picks using two different inversion algorithms. For each inversion technique, we calculated ratios of P-to S-wave velocities (V(P)/V(S)) where there is coincident P-and S-wave ray coverage. We compare the two V(P) inverse velocity models to each other and to results from forward modeling, and we compare the V(S) inverse models. The V(S) and V(P)/VS models differ in structural details from the V(P) models. In particular, dipping, tabular zones of low V(S), or high V(P)/V(S), appear to define two fault zones in the central Transverse Ranges that could be parts of a positive flower structure to the San Andreas fault. These two zones are marginally resolved, but their presence in two independent models lends them some credibility. A plot of V(S) versus V(P) differs from recently published plots that are based on direct laboratory or down-hole sonic measurements. The difference in plots is most prominent in the range of V(P) = 3 to 5 km/s (or V(S) similar to 1.25 to 2.9 km/s), where our refraction V(S) is lower by a few tenths of a kilometer per second from V(S) based on direct measurements. Our new V(S) - V(P) curve may be useful for modeling the lower limit of V(S) from a V(P) model in calculating strong motions from scenario earthquakes.


类型Article
语种英语
国家USA ; Germany
收录类别SCI-E
WOS记录号WOS:000284997900020
WOS关键词REGION SEISMIC EXPERIMENT ; LOS-ANGELES BASIN ; 1994 NORTHRIDGE EARTHQUAKES ; TRANSVERSE RANGES ; CRUSTAL STRUCTURE ; MOJAVE DESERT ; FAULT SYSTEMS ; SAN-FERNANDO ; ZONE ; TOMOGRAPHY
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/163580
作者单位1.US Geol Survey, Menlo Pk, CA 94025 USA;
2.Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany;
3.Univ Wisconsin, Madison, WI 53706 USA
推荐引用方式
GB/T 7714
Murphy, Janice M.,Fuis, Gary S.,Ryberg, Trond,et al. Detailed P- and S- Wave Velocity Models along the LARSE II Transect, Southern California[J]. United States Geological Survey,2010,100(6):3194-3212.
APA Murphy, Janice M.,Fuis, Gary S.,Ryberg, Trond,Lutter, William J.,Catchings, Rufus D.,&Goldman, Mark R..(2010).Detailed P- and S- Wave Velocity Models along the LARSE II Transect, Southern California.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,100(6),3194-3212.
MLA Murphy, Janice M.,et al."Detailed P- and S- Wave Velocity Models along the LARSE II Transect, Southern California".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 100.6(2010):3194-3212.
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