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

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。

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.