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四川汶川Ms 8.0级地震同震变形特征和分段性
Co-seismic deformation features and segmentation of the Ms 8.0 Wenchuan earthquake in Sichuan, China
【摘要】 汶川地震发育2条地表破裂带,一条沿中龙门山活动断裂带分布,另一条沿前龙门山活动断裂带分布,前者长超过200km,后者长约80km。同震变形在地表表现为逆冲膝折带,走向N45~60°E,形成公路路面隆起和农田陡坎。逆冲膝折带西北侧抬高,东南侧下降。在剖面上冲断带倾向北西,倾角50~60°。膝折带两侧相对高差沿映秀-北川断裂一般为2.5~3.0m,沿都江堰-汉旺断裂为1.5~1.1m。沿中龙门山活动断裂带,同震变形运动方式具有明显的分段性,映秀-擂鼓镇段,表现为逆冲,走滑现象不明显;北川-青川段既有逆冲又有右旋走滑分量。沿前龙门山活动断裂带,同震变形运动方式主要表现为逆冲,走滑位移和分段性不明显。
【Abstract】 There are two seismic fractured zones developed when the Wenchuan earthquake happened. One occurred along the ac- tive fault-zone in the central Longmen Mts. and the other in the front of Longmen Mts.. The length of which is more than 200km and about 80km respectively. The co-seismic deformation shows thrust flexural belt with strike of N45°~60°E in the ground, which caused uplift at its northwest side and subsidence. The fault face dips to northwest with dip angle ranged from 50° to 60°. The vertical offset of the flexural belt ranges 2.5-3.0m along Yingxiu-Beichuan seismic fault, and 1.5-1.1m along Dujiangyan-Hanwang fault. Movement of co-seismic deformation presents obvious segmented features along the active fault-zone in the central Longmen Mts., for instance, in the section from Yingxiu to Leigu town, thrust without evident slip occurred; while from Beichuan to Qingchuan, thrust and dextral strike-slip both happened. But main movement along the front Longmen Mts shows thrust without slip and seg- mented features.
【Key words】 Wenchuan earthquake, Sichuan; co-seismic deformation; segmented feature;
- 【文献出处】 地质通报 ,Geological Bulletin of China , 编辑部邮箱 ,2008年12期
- 【分类号】P315.7
- 【被引频次】14
- 【下载频次】148