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    Distinct crustal isostasy trends east and west of the Rocky Mountain Front

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    Type
    Article
    Authors
    Schmandt, Brandon cc
    Lin, Fan-Chi cc
    Karlstrom, Karl E.
    KAUST Grant Number
    OCRF-2014-CRG3-2300 (F.-C.L.)
    Date
    2015-12-14
    Online Publication Date
    2015-12-14
    Print Publication Date
    2015-12-16
    Permanent link to this record
    http://hdl.handle.net/10754/597998
    
    Metadata
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    Abstract
    © 2015. American Geophysical Union. All Rights Reserved. Seismic structure beneath the contiguous U.S. was imaged with multimode receiver function stacking and inversion of Rayleigh wave dispersion and ellipticity measurements. Crust thickness and elevation are weakly correlated across the contiguous U.S., but the correlation is ∼3-4 times greater for separate areas east and west of the Rocky Mountain Front (RMF). Greater lower crustal shear velocities east of the RMF, particularly in low-elevation areas with thick crust, are consistent with deep crustal density as the primary cause of the contrasting crust thickness versus elevation trends. Separate eastern and western trends are best fit by Airy isostasy models that assume lower crust to uppermost mantle density increases of 0.18 g/cm3 and 0.40 g/cm3, respectively. The former value is near the minimum that is plausible for felsic lower crust. Location of the transition at the RMF suggests that Laramide to post-Laramide processes reduced western U.S. lower crustal density.
    Citation
    Schmandt B, Lin F-C, Karlstrom KE (2015) Distinct crustal isostasy trends east and west of the Rocky Mountain Front. Geophysical Research Letters 42: 10,290–10,298. Available: http://dx.doi.org/10.1002/2015GL066593.
    Sponsors
    Seismic data used in the study are openly available from the IRIS DMC(http:/ds.iris.edu/ds/nodes/dmc/), and the 3D seismic model will be available through the IRIS Earth Model Collaboration (http://ds.iris.edu/ds/products/emc/). Steve Hansenprovided informal feedback. Two anonymous reviewers provided comments thatimproved the manuscript. This research was supported by NSF grant EAR-1315856(B.S.), NSF grant CyberSEES-1442665 (F.-C.L.) and the King Abdullah University ofScience and Technology (KAUST) under Award No. OCRF-2014-CRG3-2300 (F.-C.L.).
    Publisher
    American Geophysical Union (AGU)
    Journal
    Geophysical Research Letters
    DOI
    10.1002/2015GL066593
    ae974a485f413a2113503eed53cd6c53
    10.1002/2015GL066593
    Scopus Count
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