地震地质 ›› 2003, Vol. 25 ›› Issue (3): 438-449.

• 新技术应用 • 上一篇    下一篇

大地切片——一种新的活动断层探测技术

何宏林1, 佃荣吉1, 下川浩一1, 高田圭太2, 原口强2, 中田高3, 岛崎邦彦4   

  1. 1. 国立产业技术综合研究所活断层研究中心, 305-8567, 日本茨城县筑波市东1-1-1中央第七;
    2. 复建调查设计株式会社, 101-0032, 日本东京都千代田区岩本町3-8-15;
    3. 广岛大学文学部地理学教室, 739-8522, 日本, 広岛県东広岛市镜山1-2-3;
    4. 东京大学地震研究所, 113-0032, 日本东京都文京区弥生1-1-1
  • 收稿日期:2002-02-26 修回日期:2002-09-10 出版日期:2003-09-03 发布日期:2009-10-26
  • 作者简介:何宏林,男,1964年生,1985年毕业于北京大学地质系,1988年在中国地震局地质研究所获硕士学位,2000年获东京大学理学博士学位,特别研究员,主要研究方向为地震地质与构造地貌、工程地震、GIS技术应用与灾害预测评估,电话:81(298)61-3668,E-mail:honglin-he@aist.go.jp.
  • 基金资助:
    地震科学联合基金(198062)和科技部项日(951102)共同资助.

GEO-SLICER—A NEW TECHNIQUE FOR DETECTING ACTIVE FAULT

HE Hong-lin1, Eikichi TSUKUD1, Kouichi SHIMOKAWA1, Keita TAKADA2, Tsuyoshi HARAGUCHI2, Takeshi NAKADA3, Kunihiko SHIMAZAKI4   

  1. 1. Active Fault Research Center, National Institute of Advanced Industrial Science and Technology, Site 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;
    2. FUKKEN Co., Ltd, FGEX Iwamototyou Building, 3-8-15 Iwamototyou, Tyouda ku, Tokyo 101-0032, Japan;
    3. Department of Geography, Hiroshima University, Kagamiyama 1-2-3, Higashi Hiroshima, Hiroshima 739-8522, Japan;
    4. Earthquake Research Institute, University of Tokyo, Yayoi 1-1-1, Bunkyo ku, Tokyo 113-0032, Japan
  • Received:2002-02-26 Revised:2002-09-10 Online:2003-09-03 Published:2009-10-26

摘要: 如何减轻突发性直下型地震造成的城市地震灾害,其中一个关键的问题就是如何准确查明城市地区的活动断层分布,并在今后的城市建设中避开这些活动断层。由于城市用地等的限制,现在被广泛应用的一些活动断层调查和探测技术,往往难以适用于城市地区。文中介绍了一种在日本发展较成熟的活动断层探测技术———大地切片调查法。该技术的应用不仅仅限于活动断层研究,而且被广泛地应用于第四纪研究、滑坡、海岸工程等领域。文中列举的3个实例展示了该技术在活动断层、砂土液化和海滨堆积构造调查中的应用。最后,对大地切片调查法的优缺点作了简单的总结。

关键词: 大地切片调查法, 活动断层, 第四纪, 松散沉积物采样法, 日本

Abstract: In order to mitigate the disaster in urban area caused by an earthquake under the city, it is very important to detect and locate the distribution of active faults in urban area, and to keep away from these active faults in future construction. Many techniques and methods for detecting active fault have been developed in the past century. Nevertheless, some methods are not suitable to being applied in urban area. It is necessary, therefore, to develop and apply some other new methods for detecting active fault in urban area. This paper introduces Geo slicer method, a newly developed technique in Japan for detecting active fault. A Geo-slicer is made of steel and has a simple structure composed of a sampling box and its shutter, and very easy to be used in the field. The Geo-slice can be taken to a laboratory for close examination or can be displayed at a meeting or even stored for future re-examinations. Moreover, this technique enables us to carry on high-resolution analyses not only in active fault research but also in many other fields with less expenditure of time, labor and money, such as the researches of liquefaction, landslide and fluviolacustrine or littoral sediments. Three examples show the application of this technique to the studies of active fault, liquefaction caused by earthquake, and littoral sediment. The first example is the Geo-slicer investigation on the Hayward Fault of San Andreas Fault system east of the San Francisco Bay. The object of the investigation is to detect fault trace 3m under ground surface, where investigation by trenching is difficult. As a result, four geo slices revealed fault traces and a firstly discovered paleo earthquake under a 3m deep trench. The second is the geo-slicer investigation of liquefaction caused by the 2000 M 6.6 Totori earthquake in Japan. The geo slices taken in Oone Island of Shimane Prefecture, Japan showed the structure of liquefaction in 3.5m deep infilled sandy soil behind a mole. The third is the geo-slicer investigation of grouted sediment near the mouth of the Columbia River, the United States. Those geo-slices revealed liquefaction relics not only caused by 1700 Cascadia earthquake but also by other older events. Finally, the advantages and shortcomings of this method have been summarized. The advantages include the following five aspects: it may decrease the earthwork to 1/100 of a trench and reserve effectively the geologic information; can be applied to weak strata where trenching is difficult; can be applied to detect active fault in urban area; multi geo-slicer and 3D-geo-slicer can be taken in a narrow area; can be conserved for future re-examinations. The shortcomings are also summarized as several aspects, such as difficult to apply to the gravel composed of big boulders and highly viscous clay sediment, and higher expenditure in developing countries.

Key words: Geo-slicer method, active fault research, Quaternary research, unsolidated sediment sampling method, Japan

中图分类号: