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Researches of fault activity and faulting process for the Major Active Faults

主要活动断裂的活动性及断裂过程研究

基本信息

批准号：
01302063
负责人：
OKADA Atsumasa
金额：
$ 9.28万
依托单位：
Aichi Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

The precise seismic profilings have carried out at the Seto Inland Sea, Ariake-kai, Yatsushiro-kai and Mikawa Bay etc., where detailed characteristics of submarine active faults have been clarified. Sediments were sampled at the some parts of these seas using sea bottom drilling and piston corerer, and their fault activity and character were analysed by the sedimentological and dating methods.The distribution of active faults beneath the deep seas such as Nankai Trough and Japan Trench has been mapped and compiled in the book entitled with -Active fault in Japan : revised edition" published from the University of Tokyo Press in 1991. This comprehensive book was edited by almost all researchers of this project, and aims to display many data of active faults in the form of sheet maps on the scale of 1 : 200, 000.The excavation study for the Median Tectonic Line active fault system has been aimed principally at revealing ages of faulting event and recurrence intervals at three localities … More in the eastern part of Shikoku. Especially, the latest event were extensively investigated and a probable candidate like ly seems to be 1596 Keicho earthquake (M=7.5).Many drilling surveys were carried out along the Umehara fault belonging to the Nobi fault system and the Kitatake fault. The activity and behaviors of faulting for these active faults were clarified by investigating the lithology and dating for the core samples obtained. The displacements during the Nobi earthquake has reexamined along the Neodani fault, and its activity during the late Quaternary has been clarified with relation to the terrace choronology.Detailed traces and classification of active fault along the major active faults were drawn on the large scale maps (scale /1 : 25, 000-1 : 10, 000) by photo-interpretation and field survey at the southern foot area of the Rokko Mountains and the western marginal area of the Kitakami River.The ^<14>C dating method by accelerator mass spectrometry has been improved for evaluating the fault activity and past events of faulting. Less

在濑户内海、有明海、八代海和三川湾等地进行了精确的地震剖面测量，阐明了海底活断层的详细特征。利用海底钻探和活塞取样器在这些海域的部分海域采集沉积物样品，用沉积学和年代学方法分析了断层的活动性和特征，绘制了南海海槽和日本海沟等深海活动断层的分布图，并编入《日本活动断层：修订版》，东京大学出版社1991年出版。这本综合性的书是由本项目的几乎所有研究人员编辑的，旨在以1：20万的幅图形式展示活动断层的许多资料。中央构造线活动断层系统的挖掘研究主要是为了揭示三个地点的断层事件的年龄和复发间隔 ...更多信息在四国的东部。特别是对最近的地震进行了广泛的调查，认为1596年的庆町地震（M=7.5）是一个可能的候选地震。沿着Nobi断层系的梅原断层和北武断层进行了沿着。通过对所取岩心样品的岩性和测年研究，阐明了这些活动断裂的活动性和断裂行为。通过对Nobi地震时的位移观测，重新研究了Neodani断层沿着的活动性，阐明了Neodani断层晚第四纪的活动性与阶地的关系，并在大比例尺地图上绘制了主要活动断层沿着的详细活动痕迹和分类图本文通过对六高山南麓和北上川西缘地区的野外调查和照相解译，获得了1：25000 -1：10000的地球化学资料，<14>并改进了加速器质谱~（13）C测年方法，以评价断层活动性和断层活动的历史事件。少