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Intraplate volcanism controlled by back‐arc and continental structures in NE Asia inferred from transdimensional Bayesian ambient noise tomography
Author(s) -
Kim Seongryong,
Tkalčić Hrvoje,
Rhie Junkee,
Chen Youlin
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069483
Subject(s) - geology , intraplate earthquake , lithosphere , subduction , seismology , volcanism , continental margin , plate tectonics , geophysics , volcano , seismic tomography , volcanic arc , tectonics , plume , mantle (geology) , meteorology , physics
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.