文章基本信息

标题：Velocity structure in the crust beneath the Kyushu area
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作者：Atsushi Saiga ; Satoshi Matsumoto ; Kenji Uehira 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2010
卷号：62
期号：5
页码：449-462
DOI：10.5047/eps.2010.02.003
出版社：Springer Verlag
摘要：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 V p and V p / V s 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.
关键词：Tomography ;seismic velocity ;Kyushu ;Beppu-Shimabara Graben ;Kyushu Mountains