Arid
DOI10.1130/0091-7613(1996)024<0367:TDCSOT>2.3.CO;2
Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling
Fliedner, MM; Ruppert, S; Malin, PE; Park, SK; Jiracek, G; Phinney, RA; Saleeby, JB; Wernicke, B; Clayton, R; Keller, R; Miller, K; Jones, C; Luetgert, JH; Mooney, WD; Oliver, H; Klemperer, SL; Thompson, GA
通讯作者Fliedner, MM
来源期刊GEOLOGY
ISSN0091-7613
出版年1996
卷号24期号:4页码:367-370
英文摘要

Traveltime data from the 1993 Southern Sierra Nevada Continental Dynamics seismic refraction experiment reveal low crustal velocities in the southern Sierra Nevada and Basin and Range province of California (6.0 to 6.6 km/s), as well as low upper mantle velocities (7.6 to 7.8 km/s),The crust thickens from southeast to northwest along the axis of the Sierra Nevada from 27 km in the Mojave Desert to 43 km near Fresno, California. A crustal welt is present beneath the Sierra Nevada, but the deepest Moho is found under the western slopes, not beneath the highest topography. A density model directly derived from the crustal velocity model but with constant mantle density satisfies the pronounced negative Bouguer anomaly associated with the Sierra Nevada, but shows large discrepancies of >50 mgal in the Great Valley and in the Basin and Range province. Matching the observed gravity with anomalies in the crust alone is not possible with geologically reasonable densities; we require a contribution from the upper mantle, either by lateral density variations or by a thinning of the lithosphere under the Sierra Nevada and the Basin and Range province. Such a model is consistent with the interpretation that the uplift of the present Sierra Nevada is caused and dynamically supported by asthenospheric upwelling or litho spheric thinning under the Basin and Range province and eastern Sierra Nevada.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1996UE64600020
WOS关键词CALIFORNIA ; EXTENSION ; UPLIFT ; VALLEY
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/132752
作者单位(1)LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550;(2)DUKE UNIV,DURHAM,NC 27706;(3)UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521;(4)SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182;(5)PRINCETON UNIV,PRINCETON,NJ 08544;(6)CALTECH,PASADENA,CA 91125;(7)UNIV TEXAS,EL PASO,TX 79968;(8)UNIV NEVADA,RENO,NV 89557
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Fliedner, MM,Ruppert, S,Malin, PE,et al. Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling[J],1996,24(4):367-370.
APA Fliedner, MM.,Ruppert, S.,Malin, PE.,Park, SK.,Jiracek, G.,...&Thompson, GA.(1996).Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling.GEOLOGY,24(4),367-370.
MLA Fliedner, MM,et al."Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling".GEOLOGY 24.4(1996):367-370.
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