Intraplate volcanism controlled by back-arc and continental structures in NE Asia inferred from transdimensional Bayesian ambient noise tomography

Seongryong Kim, Hrvoje Tkalčić, Junkee Rhie, Youlin Chen

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Intraplate volcanism adjacent to active continental margins is not simply explained by plate tectonics or plume interaction. Recent volcanoes in northeast (NE) Asia, including NE China and the Korean Peninsula, are characterized by heterogeneous tectonic structures and geochemical compositions. Here we apply a transdimensional Bayesian tomography to estimate high-resolution images of group and phase velocity variations (with periods between 8 and 70 s). The method provides robust estimations of velocity maps, and the reliability of results is tested through carefully designed synthetic recovery experiments. Our maps reveal two sublithospheric low-velocity anomalies that connect back-arc regions (in Japan and Ryukyu Trench) with current margins of continental lithosphere where the volcanoes are distributed. Combined with evidences from previous geochemical and geophysical studies, we argue that the volcanoes are related to the low-velocity structures associated with back-arc processes and preexisting continental lithosphere.

Original languageEnglish
Pages (from-to)8390-8398
Number of pages9
JournalGeophysical Research Letters
Volume43
Issue number16
DOIs
Publication statusPublished - 2016 Aug 28
Externally publishedYes

Keywords

  • ambient noise tomography
  • back arc
  • crustal and upper mantle structure of Northeast Asia
  • intraplate volcanism
  • surface wave analysis
  • transdimensional Bayesian inversion

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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