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Analyses of Sub Moho boundary in Island-arc

岛弧亚莫霍面边界分析

基本信息

批准号：
20540406
负责人：
IIDAKA Takashi
金额：
$ 2.83万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20540406/
关键词：
レシーバ関数解析モホ面屈折法解析屈折法癬析

项目摘要

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

在日本，地震结构已经根据地震预测项目得到。最近，还进行了使用接收器函数研究的地震研究，以确定日本下方的地震结构。在分析中，空间高密度地震阵列命名Hi-net。从接收器功能研究中获得的地震图像与折射研究中获得的地震图像进行了比较。在日本西南部，接收器函数研究获得的地震图像与折射研究获得的地震图像一致。在日本中部和日本东北部，接收函数分析的地震图像与折射研究的地震图像一致。除折射莫霍面外，还发现了一个比折射莫霍面深10 km的明显边界。研究结果表明，在日本中部和东北部存在比折射莫霍界面深10 km的次莫霍界面。本 ...更多信息通过折射波测量与接收函数研究的对比，得出了折射波测量与接收函数研究之间的关系。研究了亚莫霍面边界的区域变化特征。发现了一个有趣的区域变化特征，即亚莫霍界面位于活火山区。研究了折射莫霍面与亚莫霍面之间的地震结构。在该层中发现了特征结构。该层被表征为是反射性的。散射分布模型适合于解释该层的观测特征。在大陆区，研究了地壳和上地幔的地震结构。大陆区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。日本地下的最上层地幔并不透明。本文还对亚莫霍界面的形成过程进行了研究。亚莫霍面边界的地震构造似乎是由岩浆下板作用引起的。次莫霍界面是岩浆下侵的底部。少