P and S wave attenuation tomography of the Japan subduction zone

Zewei Wang, Dapeng Zhao, Xin Liu, Chuanxu Chen, Xibing Li

研究成果: Article査読

35 被引用数 (Scopus)

抄録

We determine the first high-resolution P and S wave attenuation (Q) tomography beneath the entire Japan Islands using a large number of high-quality t* data collected from P and S wave velocity spectra of 4222 local shallow and intermediate-depth earthquakes. The suboceanic earthquakes used in this study are relocated precisely using sP depth phases. Significant landward dipping high-Q zones are revealed clearly, which reflect the subducting Pacific slab beneath Hokkaido and Tohoku, and the subducting Philippine Sea (PHS) slab beneath SW Japan. Prominent low-Q zones are visible in the crust and mantle wedge beneath the active arc volcanoes in Hokkaido, Tohoku, and Kyushu, which reflect source zones of arc magmatism caused by fluids from the slab dehydration and corner flow in the mantle wedge. Our results also show that nonvolcanic low-frequency earthquakes (LFEs) in SW Japan mainly occur in the transition zone between a narrow low-Q belt and its adjacent high-Q zones right above the flat segment of the PHS slab. This feature suggests that the nonvolcanic LFEs are caused by not only fluid-affected slab interface but also specific conditions such as high pore pressure which is influenced by the overriding plate.

本文言語English
ページ(範囲)1688-1710
ページ数23
ジャーナルGeochemistry, Geophysics, Geosystems
18
4
DOI
出版ステータスPublished - 2017 4 1

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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