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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。
The Wenchuan earthquake developed two surface rupture zones, one along the active Longmen Shan fault zone and the other along the active Longmenshan active fault zone. The former is over 200km long and the latter is about 80km long. Coseismic deformation on the surface of the performance of the thrust knee zone, to N45 ~ 60 ° E, the formation of road surface uplift and farmland scarp. The thrust knee with the northwest elevation, south-east side down. In the profile, the thrust belt tends to be northwest and dip at 50 ~ 60 °. The relative height difference on both sides of the knee belt along the Yingxiu-Beichuan fault is generally 2.5-3.0m, along the Dujiangyan-Hwangwang fault 1.5-1.1m. Along the Longmenshan active fault zone, the coseismic deformation movement mode has obvious segmentality. Yingxiu - Leigu section shows the phenomenon of thrusting and slipping is not obvious. Both Beichuan and Qingchuan sections have both thrust and dextral rotation Walk slip component. Along the Longmenshan active fault zone in the former, the coseismic deformation modes are mainly thrusting, strike-slip displacement and segmentality are not obvious.