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    Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake

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    Name:
    Porritt_et_al-2016-Geophysical ...
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    Description:
    Final Published Version
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    Author
    Porritt, Robert W. cc
    Yoshioka, Shoichi
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2016-05-28
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Porritt, R. W., and Yoshioka, S. ( 2016), Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake, Geophys. Res. Lett., 43, 4905– 4912, doi:10.1002/2016GL068168.
    Journal
    GEOPHYSICAL RESEARCH LETTERS
    Rights
    © 2016. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The 30 May 2015 Chichi-jima M8 earthquake is one of the largest deep focus earthquakes ever recorded and its depth of 682km puts it near the base of the mantle transition zone. Before source mechanisms and slip models of this earthquake can be reliably assessed, a better understanding of the tectonic setting and structures of the region near the origin is required. Here we present evidence from receiver functions, a method of isolating subsurface material contrast with converted seismic waves, that the earthquake initiated within the upper mantle transition zone, above a significantly depressed 660km phase boundary. Additionally, we observe multiple conversions within and below the transition zone, which we associate with seismic waves passing into and out of segments of the subducting Pacific plate. From this, we infer slab material is piling up at the base of the transition zone and segments are penetrating into the lower mantle.
    Note
    6 month embargo; first published: 05 May 2016
    ISSN
    0094-8276
    EISSN
    1944-8007
    DOI
    10.1002/2016gl068168
    Version
    Final published version
    Sponsors
    NSF-EAR Postdoctoral Fellowship [1249776]; Kobe University Research Center for Urban Safety and Security
    ae974a485f413a2113503eed53cd6c53
    10.1002/2016gl068168
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