Velocity structure in the crust beneath the Kyushu area

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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
Volume62
Issue number5
DOIs
Publication statusPublished - Jan 1 2010

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velocity structure
crusts
anomalies
crust
low speed
anomaly
gravity anomalies
gravity anomaly
low density materials
Moho
mountains
volcanoes
graben
ridges
volcanology
volcano
arcs
signatures
gravity
gravitation

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

Velocity structure in the crust beneath the Kyushu area. / Saiga, Atsushi; Matsumoto, Satoshi; Uehira, Kenji; Matsushima, Takeshi; Shimizu, Hiroshi.

In: earth, planets and space, Vol. 62, No. 5, 01.01.2010, p. 449-462.

Research output: Contribution to journalArticle

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