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2008年5月12日四川省汶川县发生了Ms 8.0级大地震,震后遥感影像解译与调查结果表明,在约48 700km2的区域内,地震诱发了不少于48000处的滑坡灾害。基于GIS空间分析方法,分别使用滑坡面积与滑坡数量这两个统计参数,对滑坡的地层岩性、坡度、滑向、高程、所在烈度区、上下盘位置和与发震断裂的距离等共7个参数进行了统计分析。统计结果表明,汶川地震滑坡多发育在(1)砂岩、粉砂岩、千枚岩与灰岩地层中;(2)坡度为30°～50°,尤其是35°～45°范围内;(3)沿着垂直于发震断裂SEE方向运动;(4)高程为800～2000m,尤其是1000～1600m范围内;(5)Ⅷ～Ⅺ烈度区范围内;(6)发震断裂的上盘:(7)距离发震断裂40km,尤其是10km的区域内。
On May 12, 2008, a Ms 8.0 Ms 8.0 earthquake hit Wenchuan County, Sichuan Province. Interpretation and investigation of the remote sensing images after the earthquake showed that no earthquakes caused no less than 48,000 landslides in about 48 700 km2 area. Based on GIS spatial analysis method, two statistic parameters of landslide area and landslide number are respectively used to analyze the lithology, slope, slip direction, elevation, the intensity region where the landslide is located, the location of the upper and lower disks and the distance to the seismogenic fault A statistical analysis of the parameters. The statistical results show that the landslides in the Wenchuan earthquake are mostly developed in (1) sandstone, siltstone, phyllite and limestone strata; (2) the slope is in the range of 30 ° to 50 °, especially in the range of 35 ° to 45 °; ) Along the SEE direction perpendicular to the seismogenic fault movement; (4) Elevation 800 ~ 2000m, especially in the range of 1000 ~ 1600m; (5) Ⅷ ~ Ⅺ intensity range; (7) Within 40 km, especially 10 km from the seismogenic fault.