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Seismic Risk Evaluation of Inland Active Faults

内陆活动断层地震风险评价

基本信息

批准号：
07308035
负责人：
NAKATA Takashi
金额：
$ 7.36万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07308035/
关键词：
Active Fault Detailed Active Fault Map Seismic Risk Evaluation 地震危険度

项目摘要

FOr seismic risk evaluation of active faults inland Japan, we carried out detailed mapping of active faults especially distributed in densely populated areas such as three metropolitan districts and other major cities. The maps in 1 : 25,000 scale are published from Geographical Institute of Japan, Ministry of Construction.The surface fault ruptures associated with the 1995 Hyogoken-nambu earthquake have been mapped and trenched in order to clarify their extent, slip distribution, mode of faulting and paleoseismic history.We proposed a method to predict rupture propagation which is closely related with strong ground motions and resulting earthquake damage based on an interdependent correlation between the branching direction of the surface ruptures associated with several large historical earthquakes and the direction of their propagation. As patterns of surface traces of active faults are results of repeated earthquake faulting, the branching of several active faults with well-defined branching such as the active faults in Kobe-Osaka area are examined to propose that the direction of their future rupture propagation.We carried out paleoseismological studies on several distinctive active faults using conventional trench excavation method. Newly developed research method and equipment so-called Geo-slicer for more effective paleoseismological field studies, were tested on active fault traces of two most active fault systems in Japan, the Itoigawa-Shizuoka Tectonic Line and the Median Tectonic Line, and obtained promising results. For seismic risk evaluation, the active fault system along the Median Tectonic Line in Shikoku were examined by mini-trenching and Geo-slicing, and aseismic for a large earthquake is revealed based on its paleoseismic history.

为了评估日本内陆活动断裂的地震危险性，我们对活动断裂进行了详细的测绘，特别是分布在人口稠密地区的活动断裂，如三个大都市区和其他主要城市。1：25,000比例尺的地图由日本建设省地理研究所出版。为了弄清它们的范围、滑动分布、断裂方式和古地震历史，我们绘制了与1995年Hyogoken-Nambu地震有关的地表断裂的地图和沟槽。我们提出了一种基于与几次历史大地震相关的地表断裂的分支方向与其传播方向之间的相互依赖关系来预测与强地面运动和震害密切相关的破裂传播的方法。由于活动断裂的地表遗迹是反复地震断裂作用的结果，因此对神户-大阪地区的活动断裂等分支明确的活动断裂的分支进行了研究，提出了它们未来的破裂传播方向。为更有效地进行古地震野外研究而开发的新的研究方法和设备，在日本两个最活跃的断裂系统--Itoigawa-Shizuoka构造线和中值构造线的活动断裂迹线上进行了测试，取得了良好的结果。在地震危险性评价中，对四国中构造线沿线的活动断裂系统进行了小型切槽和地质切片，并根据大地震的古地震历史揭示了大地震的无震性。