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Comparison between crustal density and velocity variations in southern California

Langenheim, V. E. and Hauksson, Egill (2001) Comparison between crustal density and velocity variations in southern California. Geophysical Research Letters, 28 (16). pp. 3087-3090. ISSN 0094-8276. doi:10.1029/2001GL013392.

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We predict gravity from a three-dimensional V_p model of the upper crust and compare it to the observed isostatic residual gravity field. In general this comparison shows that the isostatic residual gravity field reflects the density variations in the upper to middle crust. Both data sets show similar density variations for the upper crust in areas such as the Peninsular Ranges and the Los Angeles basin. Both show similar variations across major faults, such as the San Andreas and Garlock faults in the Mojave Desert. The difference between the two data sets in regions such as the Salton Trough, the Eastern California Shear Zone, and the eastern Ventura basin (where depth to Moho is <30 km), however, suggests high-density middle to lower crust beneath these regions. Hence the joint interpretation of these data sets improves the depth constraints of crustal density variations.

Item Type:Article
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URLURL TypeDescription DOIArticle
Hauksson, Egill0000-0002-6834-5051
Additional Information:© 2001 by the American Geophysical Union. Received May 3, 2001; accepted June 18, 2001. Research was supported in part by U.S.G.S. grant 01HGR0038, and from the Southern California Earthquake Center to E. Hauksson (SCEC contribution 579). Contribution 8760, Div. of Geol. and Planetary Sciences, Caltech, Pasadena. We thank two anonymous reviewers, T.M. Brocher and R.J. Blakely, and comments by R.W. Simpson, R.C. Jachens, and T.G. Hilde.
Group:Seismological Laboratory
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Southern California Earthquake Center (SCEC)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)579
Caltech Division of Geological and Planetary Sciences8760
Issue or Number:16
Record Number:CaltechAUTHORS:20130215-134619909
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36963
Deposited By: Tony Diaz
Deposited On:15 Feb 2013 23:56
Last Modified:09 Nov 2021 23:25

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