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CiteWeb id: 19960000115

CiteWeb score: 4445

Traveltimedatafromthe1993SouthernSierraNevadaContinentalDynamicsseismic refractionexperimentreveallowcrustalvelocitiesinthesouthernSierraNevadaandBasin and Range province of California (6.0 to 6.6 km/s), as well as low upper mantle velocities (7.6to7.8km/s).ThecrustthickensfromsoutheasttonorthwestalongtheaxisoftheSierra 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 BougueranomalyassociatedwiththeSierraNevada,butshowslargediscrepanciesof>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;werequireacontributionfromtheuppermantle,eitherbylateraldensityvariations 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 lithospheric thinning under the Basin and Range province and eastern Sierra Nevada.

The publication "Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling" is placed in the Top 10000 of the best publications in CiteWeb. Also in the category Geology it is included to the Top 100. Additionally, the publicaiton "Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling" is placed in the Top 1000 among other scientific works published in 1996.
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