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Evaluating the activity of Holocene faults in Japan

评估日本全新世断层的活动性

基本信息

批准号：
07308007
负责人：
IKEDA Yasutaka
金额：
$ 7.74万
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 (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-07308007/
关键词：
active faults Holocene faults slip rate photo interpretation surface deformation geometry of faults 返射法地震探査完新世

项目摘要

The overall objectives of this study are to evaluate the activity of Holocene faults in Japan, and to provide basic quantitative data for understanding the tectonics of the Japan arc in recent geologic past.In 1995-1997, we carried out air-photo interpretation over representative fault zones in the Japan arc using high-resolution, large-scale aerial photos, in order to map precise geometry of and to extract deformation associated with Holocene faults. As a result of this work, we found many lines of new evidence for surface deformation on Holocene geomorphic surfaces, which provide us important data for segmentation and grouping problems of active faults. Part of this mapping work has been published as "Active Fault Map of Urban Area" Series from the Geographical Survey Institute in 1996.In order to determine the rate of net slip on a fault zone, information on subsurface geometry of the fault zone, as well as the rate of surface deformation, is necessary. On the basis of air-photo mapping, we carried out field researches of geomorphology, surface geology, drilling, reflection seismic profiling, and gravity survey for selected fault zones in 1996-1997. These integrated researches have revealed to be effective in evaluating the overall activity of faults in recent geologic past.

这项研究的总体目标是评价日本全新世断裂的活动性，并为了解日本弧近代地质历史的构造提供基本的定量数据。1995-1997年，我们利用高分辨率、大比例尺的航空照片对日本弧内具有代表性的断裂带进行了航片解译，以绘制全新世断裂的精确几何图形并提取与之相关的形变。通过这项工作，我们在全新世地貌面上发现了许多地表形变的新证据，为活动断裂的分割和分组问题提供了重要的数据。这项测绘工作的一部分已于1996年由地理测量研究所出版为《城市地区活动断裂图》系列。为了确定断裂带的净滑动速率，需要断裂带的地下几何信息以及地表形变速率的信息。在航片填图的基础上，于1996-1997年对所选断裂带进行了地貌、地表地质、钻井、反射地震剖面和重力测量等野外研究。这些综合研究表明，这些综合研究在评价断裂在近代地质历史中的整体活动性方面是有效的。