Seismic shear wave reflectivity structure of the mantle beneath northeast China and the northwest Pacific

Brian Bagley, Anna M. Courtier, Justin Revenaugh

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Using multiple ScS reverberations, we examine the mantle reflectivity structure beneath northeast China and the northwest Pacific. We find several upper mantle discontinuities, including a melt layer with a mean thickness of 64 km atop the 410 km discontinuity, present on both sides of the subducting slab near the Nankai trench. The transition zone contains a split 520 km discontinuity in several paths, and tomographic images show stagnant slabs at this depth. We believe that this may be slab related based on experimental work. A negative reflector is found in one path beneath the northeast China craton at a depth of 598 km. Mid-mantle reflectors are found in all of our paths and are present throughout a wide depth range (~750-1600 km). Key Points The LAB appears depressed beneath northeast China Splitting of the 520-km might be related to exsolution of Ca-perovskite Mid-mantle reflectors are ubiquitous in the region

Original languageEnglish (US)
Pages (from-to)5417-5427
Number of pages11
JournalJournal of Geophysical Research: Solid Earth
Volume118
Issue number10
DOIs
StatePublished - Oct 2013

Keywords

  • discontinuities
  • lithosphere-asthenosphere boundary
  • low-velocity zone
  • mantle
  • transition zone

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