Velocity structure in the crust beneath the Kyushu area

Atsushi Saiga, Satoshi Matsumoto, Kenji Uehira, Takeshi Matsushima, Hiroshi Shimizu

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)449-462
Number of pages14
Journalearth, planets and space
Issue number5
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science


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