Study on a mantle upwelling in southwestern Japan and its tectonic implications

日本西南部地幔上升流研究及其构造意义

• 批准号: 21740318
• 负责人: NAKAJIMA Junichi
• 金额: $ 2.08万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740318/
• 关键词: 地震波速度構造; トモグラフィ; 上昇流; 紀伊半島; 地震波速度トモグラフィ; 地震波形; スペクトル; 低周波地震; 流体

We estimated three-dimensional seismic velocity and attenuation structures beneath southwestern Japan using a large number of high-quality seismic waveform data. The obtained results that a large low-velocity and high-attenuation zone is distributed in the upper mantle and appears to penetrate into the Philippine Sea slab locally beneath the Kii Peninsula. Seismo-and volcano-tectonics beneath SW Japan may be controlled by the mantle upwelling which is probably related to deep dehydration of the Pacific slab.

我们使用大量高质量的地震波形数据估计了日本西南部的三维地震速度和衰减结构。结果表明，在纪伊半岛下的上地幔中存在一个大的低速高衰减带，并在局部地区穿透菲律宾海板块。日本西南部的地震和火山构造可能受地幔上涌的控制，这可能与太平洋板块的深度脱水有关。

项目成果

What controls interplate coupling?: Evidence for abrupt change in coupling across a border between two overlying plates in the NE Japan subduction zone

• DOI: 10.1016/j.epsl.2009.04.003
• 发表时间: 2009-06
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: N. Uchida;J. Nakajima;A. Hasegawa;T. Matsuzawa

Subduction of a wedge‐shaped Philippine Sea plate beneath Kanto, central Japan, estimated from converted waves and small repeating earthquakes

• DOI: 10.1029/2009jb006962
• 发表时间: 2010-07
• 期刊: Journal of Geophysical Research
• 作者: N. Uchida;T. Matsuzawa;J. Nakajima;A. Hasegawa