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Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling

Fliedner, Moritz M. and Ruppert, Stanley and Malin, P. E. and Park, S. K. and Jiracek, G. and Phinney, R. A. and Saleeby, J. B. and Wernicke, B. and Clayton, R. and Keller, R. and Miller, K. and Jones, C. and Luetgert, J. H. and Mooney, W. D. and Oliver, H. and Klemperer, S. L. and Thompson, G. A. (1996) Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling. Geology, 24 (4). pp. 367-370. ISSN 0091-7613. http://resolver.caltech.edu/CaltechAUTHORS:20140723-100821423

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Abstract

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 lithospheric thinning under the Basin and Range province and eastern Sierra Nevada.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/0091-7613(1996)024<0367:TDCSOT>2.3.CO;2 DOIArticle
http://geology.geoscienceworld.org/content/24/4/367PublisherArticle
http://geology.gsapubs.org/content/24/4/367PublisherArticle
ORCID:
AuthorORCID
Wernicke, B.0000-0002-7659-8358
Clayton, R.0000-0003-3323-3508
Additional Information:© 1996 Geological Society of America. Manuscript received August 21, 1995; Revised manuscript received December 21, 1995; Manuscript accepted December 22, 1995. The Southern Sierra Continental Dynamics project is supported by the National Science Foundation (NSF) grant EAR-91-19263 to Duke University; this work was supported by NSF grants EAR-92-04998 and EAR-94- 05577 to Stanford University and Department of Energy contract W-7405-ENG-48 to Lawrence Livermore National Laboratory. The seismic data were collected with support from the U.S. Geological Survey and the Program for Array Seismic Studies of the Continental Lithosphere (PASSCAL) and are available from the Incorporated Research Institutions for Seismology (IRIS) Data Management Center, via http://www.iris.washing ton.edu/. We thank Tom Parsons and an anonymous reviewer for helpful reviews.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-91-19263
NSFEAR-92-04998
NSFEAR-94-05577
Department of Energy (DOE)W-7405-ENG-48
Record Number:CaltechAUTHORS:20140723-100821423
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140723-100821423
Official Citation:Moritz M. Fliedner, Stanley Ruppert, and Southern Sierra Nevada Continental Dynamics Working Group Three-dimensional crustal structure of the southern Sierra Nevada from seismic fan profiles and gravity modeling Geology, April, 1996, v. 24, p. 367-370, doi:10.1130/0091-7613(1996)024<0367:TDCSOT>2.3.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47422
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Jul 2014 17:40
Last Modified:31 Jan 2017 21:24

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