Velocity structure in the crust beneath the Kyushu area

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

We present high-resolution three-dimensional tomographic images of the crust beneath the entire Kyushu arc, and particularly the western portion. Our results reveal a velocity anomaly that correlates well with an upper crustal gravity anomaly. Significant low-velocity anomalies exist beneath the Miyazaki plane and along the Beppu-Shimabara Graben. Another extensive low-velocity region near the bottom of the crust is located just below the volcanic front and between active volcanoes. The low-velocity anomalies exhibit low Vp and Vp/Vs characteristics, and the spatial relationship between these anomalies, the Bouguer gravity anomaly, and the Moho suggests that low-density material at the base of the crust is responsible for both the seismic and gravity signatures. We interpret this material to constitute a relict ridge subducting below the Kyushu Mountains.

本文言語英語
ページ(範囲)449-462
ページ数14
ジャーナルearth, planets and space
62
5
DOI
出版ステータス出版済み - 2010

All Science Journal Classification (ASJC) codes

  • 地質学
  • 宇宙惑星科学

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