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    The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions

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    Date
    2018-09-22
    Author
    Shen, Weisen  Concept link
    Wiens, Douglas A.  Concept link
    Anandakrishnan, Sridhar  Concept link
    Aster, Richard C.  Concept link
    Gerstoft, Peter  Concept link
    Bromirski, Peter D.  Concept link
    Hansen, Samantha E.  Concept link
    Dalziel, Ian W. D.  Concept link
    Heeszel, David S.  Concept link
    Huerta, Audrey D.  Concept link
    Nyblade, Andrew A.  Concept link
    Stephen, Ralph A.  Concept link
    Wilson, Terry J.  Concept link
    Winberry, J. Paul  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10702
    As published
    https://doi.org/10.1029/2017JB015346
    DOI
    10.1029/2017JB015346
    Keyword
     Seismology; Crust and uppermost mantle; Ambient noise tomography; Antarctica; Transantarctic Mountains; Gamburtsev Mountains 
    Abstract
    We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3‐D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3‐D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849
     

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