Mantle transition zone, stagnant slab and intraplate volcanism in Northeast Asia

Chuanxu Chen, Dapeng Zhao, You Tian, Shiguo Wu, Akira Hasegawa, Jianshe Lei, Jung Ho Park, Ik Bum Kang

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

3-D P- and S-wave velocity structures of the mantle down to a depth of 800 km beneath NE Asia are investigated using ~981 000 high-quality arrival-time data of local earthquakes and teleseismic events recorded at 2388 stations of permanent and portable seismic networks deployed in NE China, Japan and South Korea. Our results do not support the existence of a gap (or a hole) in the stagnant slab under the Changbai volcano, which was proposed by a previous study of teleseismic tomography. In this work we conducted joint inversions of both local-earthquake arrival times and teleseismic relative traveltime residuals, leading to a robust tomography of the upper mantle and the mantle transition zone (MTZ) beneath NE Asia. Our joint inversion results reveal clearly the subducting Pacific slab beneath the Japan Islands and the Japan Sea, as well as the stagnant slab in the MTZ beneath the Korean Peninsula and NE China. A big mantle wedge (BMW) has formed in the upper mantle and the upper part of the MTZ above the stagnant slab. Localized low-velocity anomalies are revealed clearly in the crust and the BMW directly beneath the active Changbai and Ulleung volcanoes, indicating that the intraplate volcanism is caused by hot and wet upwelling in the BMW associated with corner flows in the BMW and deep slab dehydration as well.

Original languageEnglish
Pages (from-to)68-85
Number of pages18
JournalGeophysical Journal International
Volume209
Issue number1
DOIs
Publication statusPublished - 2017 Apr 1

Keywords

  • Asia
  • Earthquake dynamics
  • Hotspots
  • Intra-plate processes
  • Mantle processes
  • Subduction zone processes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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