Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake
AffiliationUniv Arizona, Dept Geosci
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationPorritt, 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.
JournalGEOPHYSICAL RESEARCH LETTERS
Rights© 2016. American Geophysical Union. All Rights Reserved.
Collection InformationThis 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 email@example.com.
AbstractThe 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.
Note6 month embargo; first published: 05 May 2016
VersionFinal published version
SponsorsNSF-EAR Postdoctoral Fellowship ; Kobe University Research Center for Urban Safety and Security