Analyses of Sub Moho boundary in Island-arc

在日本，地震预报项目已经得到了抗震结构。最近，还进行了利用接收函数研究的地震研究，以宣布日本地下的地震结构。在分析中，使用了空间高密度地震台阵Hi-Net。将接收函数研究得到的地震图像与折射研究得到的地震图像进行了比较。在日本西南部，接收函数研究获得的地震图像与折射研究获得的地震图像是一致的。在日本中部和东北部，接收函数分析的地震图像与折射研究的地震图像是一致的。除了折射莫霍面外，在这些地区还发现了比折射莫霍面深10公里的清晰边界。研究表明，日本中部和东北部存在比折射莫霍面深10公里的次莫霍面边界。The Bun…通过验光测量与接收函数研究的对比，得到了更多的结果。研究了次莫霍面边界的区域变化特征。发现了区域变化的一个有趣的特征。莫霍面以下边界位于活火山所在地区的区域。研究了折射莫霍面与次莫霍面之间的地震构造。在这一层中发现了一种特征结构。这一层的特征是具有反射性。散射分布模型适用于解释该层的观测特征。在陆相区，研究了地壳和上地幔的地震结构。大陆地区的地震构造具有上地壳透明、下地壳反射、上地幔透明的结构特征。日本的地震构造与大陆地区不同。日本最上层的地幔并不透明。本文还对次莫霍面边界的形成过程进行了研究。具有次莫霍面边界的地震构造似乎是由板块下的岩浆造成的。次莫霍面是电镀岩浆的底部。较少

In Japan, the seismic structure has been obtained based on the earthquake prediction project. Recently, seismic studies using receiver function study were also done to declare the seismic structure beneath Japan. In the analyses, spatially high dense seismic array named Hi-net was used. The seismic images obtained from receiver function studies were compared with those of refraction studies. In southwestern Japan, the seismic images obtained from receiver function studies are consistent with those obtained from refraction studies. In the central part of Japan and northeastern parts of Japan, the seismic images of receiver function analyses are consistent with those of refraction studies. In addition to refraction Moho, a clear boundary was found which is 10 km deeper than refraction Moho, in the regions. This study suggested that existence of the sub-Moho boundary, which is 10 km deeper than refraction Moho boundary, in the central part of Japan and northeastern part of Japan. The boun … More dary was obtained from the comparison between the refraction survey and receiver function study. The characteristics of the regional variation of the sub-Moho boundary were researched. An interesting characteristic of the regional variation was found. The area that the sub-Moho boundary is located in the region that the active volcanoes are located. The seismic structure between the refraction Moho and sub-Moho was researched. A characteristic structure was found at the layer. The layer was characterized to be reflective. The scatter distributed model is suitable to explain the observed characteristics at the layer. In the continental region, the seismic structure of the crust and uppermost mantle has been studied. The seismic structure in the continental region was characterized with following structure which has transparent upper crust, reflective lower crust and transparent uppermost mantle. The seismic structure in Japan is different that of continental region. The uppermost mantle beneath Japan was not transparent. In this study, the formation process of the sub-Moho boundary was also studied. The seismic structure with sub-Moho boundary seems to be caused by the magmatic under plating. The sub-Moho boundary is the bottom of the magmatic under plating. Less