汶川地震地表破裂带宽度与断层上盘效应

北京大学学报（自然科学版）

汶川地震地表破裂带宽度与断层上盘效应

何仲太^1,2,马保起²,李玉森³,郝彦军²,沙鹏²

1. 北京大学地球与空间科学学院, 北京 100871; 2. 中国地震局地壳应力研究所地壳动力学重点实验室, 北京 100085; 3. 青岛市工程地震研究所, 青岛 266003;

收稿日期:2012-01-16 出版日期:2012-11-20 发布日期:2012-11-20

Width and Hanging Wall Effect of Surface Rupture Caused by Wenchuan Earthquake

HE Zhongtai^1,2, MA Baoqi², LI Yusen³, HAO Yanjun², SHA Peng²

1. School of Earth and Space Sciences, Peking University, Beijing 100871; 2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, CEA, Beijing 100085; 3. Qingdao Institute of Engineering Earthquake, Qingdao 266003;

Received:2012-01-16 Online:2012-11-20 Published:2012-11-20

摘要/Abstract

摘要： 以汶川地震产生的地表破裂宽度为研究对象, 以地表微变形、裂隙和鼓包、叠瓦状断层及反冲断层等为标志界定破裂的宽度, 查明中央破裂带和前山破裂带宽度的分布。结果表明, 中央断裂带与汉旺?白鹿断裂带的地表破裂宽度不同, 中央断裂带不同段落的地表破裂宽度也不相同。断层还表现出明显的断层上盘效应, 北川?映秀断裂上盘最小避让距离为70 m, 下盘最小避让距离为23.5 m, 断层两侧避让总宽度不应小于108 m; 汉旺?白鹿断裂上盘最小避让距离为35 m, 下盘最小避让距离20 m, 总避让宽度不应小于58 m。地表破裂宽度及断层上盘效应与破裂带陡坎高度、地震烈度分布、强震记录具有较好的一致性。

关键词: 汶川地震, 地表破裂宽度, 断层上盘效应, 避让距离

Abstract: The authors make the width of surface rupture caused by 2008 Ms 8.0 Wenchuan earthquake as the object, characterize the width of surface rupture by the thrust fault scarps, flexure-slip folds, and mole tracks, and check out characteristics of the width of the surface rupture along the Beichuan-Yingxiu fault and Hanwang-Bailu fault. The conclusion suggests that there is difference about the width between the Beichuan-Yingxiu fault and Hanwang-Bailu fault and about the width in different section along the same Beichuan-Yingxiu fault. Both of the faults have obvious hanging wall effect. The safety distance away from the fault in the hanging wall in rebuilding is 70 m at least and 23.5 m in the foot wall, and the total safety distance along the fault in rebuilding should be more than 108 m about the Beichuan-Yingxiu fault. The safety distance away from the fault in the hanging wall in rebuilding is 35 m at least and 20 m in the foot wall, and the total distance should be more than 58 m about the Hanwang-Bailu fault. In addition, the width and hanging wall effect of co-seismic surface rupture zone is in accordance with the hight of fault scarp, intensity isoseismal map, and strong earthquake ground motions.

Key words: Wenchuan earthquake, width of surface rupture, hanging wall effect, setback distance

中图分类号:

P315

何仲太,马保起,李玉森,郝彦军,沙鹏. 汶川地震地表破裂带宽度与断层上盘效应[J]. 北京大学学报（自然科学版）.

HE Zhongtai,MA Baoqi,LI Yusen,HAO Yanjun,SHA Peng. Width and Hanging Wall Effect of Surface Rupture Caused by Wenchuan Earthquake[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

导出引用管理器 EndNote|Ris|BibTeX

链接本文: https://xbna.pku.edu.cn/CN/

https://xbna.pku.edu.cn/CN/Y2012/V48/I6/886