鄂西建始断裂工程活动性评价

汪华斌; 吴树仁; 易顺华

鄂西建始断裂工程活动性评价

1. 中国地质大学(武汉)资源学院, 武汉 430074;
2. 中国地质科学院地质力学研究所, 北京 100081;
3. 中国地质大学(武汉)地球科学学院, 武汉 430074

基金项目:

国家自然科学基金(49772145)和长江水利委员会三峡勘测研究院委托项目资助

详细信息

作者简介:
汪华斌(1968-),男,在职博士生,主要从事构造地质学、地质灾害等方面的研究,先后在国内外期刊上发表论文近十篇。

中图分类号: P542.3
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出版历程
- 收稿日期: 1998-09-25
- 刊出日期:

ENGINEERING EVALUATION OF ACTIVITY OF JIANSHI FAULT IN WESTERN HUBEI PROVINCE

1. Faculty of Resources, China University of Geosciences, Wuhan Hubei 430074;
2. Institute of Geomechanics, CAGS, Beijing 100081;
3. Faculty of Earth Sciences, China University of Geosciences, Wuhan Hubei 430074

摘要

摘要: 本文通过对鄂西建始断裂的几何分形结构和变形结构的分析,结合其新构造活动、现今构造活动特征,探讨断裂的运动学和动力学特征以及形成演化过程。建始断裂分段特征明显,在燕山主期以逆冲作用为主,在燕山晚期以伸展作用为其主要活动特征,在喜马拉雅期则表现为平面左旋剪切活动;在新构造活动期以右旋剪切为主,北段构造活动性相对较强,中段和南段构造活动性相对较弱。断裂在Q₁-Q₂时期有过明显的活动,其最新活动测试年龄为0.1976±0.16Ma,且现今地震活动微弱,拟定为非工程活动断裂,对附近水电工程建设不存在根本性危害。
- 建始断裂 /
- 活动特征
Abstract: A detailed study of the fractal geometry deformation structure, as well as the latest and present tectonic activity of Jianshi fault has been made to bring to light the kinematic and dynamic characteristics of the fault and its evolution.It was a thrust fault in the main episode of the Yanshanian epoch, an extension fault in the late Yanshanian and a sinistral strike slip fault in the Himalayan.In the Neogene, the northern segment of the fault underwent a stronger dextral strike slip than its central and southern segments.In Q₁-Q₂ it was once active, and age of the latest activity is determined to be about 197.6±160 thousand years and is presently weak in seismicity.It is therefore concluded that the Jianshi fault is an in active fault, in the engineering sense, causing no essential harm to the nearby hydropower works.
- Jianshi fault /
- fault activity