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Research in faulted archaeological site

断层考古遗址研究

基本信息

批准号：
10680104
负责人：
WATANABE Mitsuhisa
金额：
$ 1.92万
依托单位：
Toyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680104/
关键词：
active fault archaeological site paleoseismicity geomorphologic development

项目摘要

Geomorphologic development and the deformation of archaeological site close to active fault are investigated in the western marginal area of Takada Plain, Nozawa Village, Nagano Prefecture and Hokusei Town, Mie Prefecture. Archaeological site is very useful to examine the paleoseismicity as follows:Monoclinal deformations have been accumulated at least since ca.100 ka in the western marginal area of Takada Plain. The Otsuka site is located in the flexural scarp. Although the ruins of Kofun age are not deformed, the surface of Jomon age is possibly affected by faulting. The Shinano (Chikuma) River has formed several fluvial terraces since the Middle Pleistocene around the Nozawa Village where no active fault trace is known. The Higashihara site located on the lower terrace surface shows the tilting about 10 degrees toward east. The latest faulting event occurred ca.3ka and the age of penultimate one is older than ca.5.5 ka. The history of past faulting events can be investigated on the basis of the geomorphologic development and the deformation of the archaeological site. Hokusei-Tado Flexure is located in the western fringe of the Yoro Mts, Mie Prefecture. The fault vertically offsets the young terrace surface by 1.5-1.8 m. The surface is not dated and three is no historic record of seismic disaster. However, the surface of Kamisosaku site on the fluvial surface is dipping toward SW displaying the evidence for recent reactivation of the Hokusei-Tado Flexure since 6th century.The timing of past faulting event is clearly shown by reference to the deformation of archaeological site. We need to prmote the co-operative works of archaeologist and tectonic geomorphologist taking the geomorphologic development into account.

对高田平原西部边缘地区、长野县野泽村和三重县北星町活动断层附近考古遗址的地貌发育和变形进行了调查。考古遗址对于研究古地震活动非常有用，具体如下：高田平原西缘地区至少在约100 ka以来积累了单斜变形。大冢遗址位于弯曲悬崖上。虽然古坟时代的遗迹没有变形，绳文时代的地表可能受到断层活动的影响。信浓（千磨）河自中更新世以来在野泽村周围形成了几个河流阶地，那里没有已知的活动断层痕迹。东原遗址位于低阶地表面，向东倾斜约10度。最近一次断裂事件发生在距今约3 ka左右，倒数第二次断裂事件的年龄大于5.5ka。考古遗址的地貌发育和变形特征可以揭示过去断层活动的历史。北势多堂Flexure位于三重县四郎山脉的西部边缘。断层垂直偏移年轻阶地表面1.5-1.8 m。地表没有年代，三是没有地震灾害的历史记载。然而，位于河流表面的上佐作遗址的表面正向SW倾斜，显示了世纪以来北势多道挠曲最近重新活动的证据。我们需要促进考古学家和构造地貌学家的合作，并考虑到地貌的发展。