Velocity structure in the crust beneath the Kyushu area

Details Velocity structure in the crust beneath the Kyushu area Velocity structure in the crust beneath the Kyushu area

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ep%26s...62..449s&link_type=abstract

Earth, Planets and Space, Volume 62, Issue 5, p. 449-462.

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Scientific paper

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.

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