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2013年7月22日,甘肃岷县、漳县发生了M_s6.6地震。震后遥感影像目视解译与实地调查结果表明,本次地震触发了至少2 330处滑坡,大概分布在一个面积为330 km~2的矩形区域内。本文在GIS平台下统计了这些滑坡的发生高程、坡度、坡向、斜坡曲率、地层岩性、PGA共6类地形、地质与地震特征参数的特征。结果表明2400 m~2 600 m的高程范围、10°~20°的坡度范围、西与北西坡向、-1~-0.1斜坡曲率值范围、古近系(E~b)砾岩与砂岩中、地震动峰值加速度(PGA)为0.16g是岷县漳县地震滑坡的多发因子区间。
On July 22, 2013, the M_s6.6 earthquake occurred in Minxian County and Zhangxian County, Gansu Province. The visual interpretation of the post-earthquake remote sensing image and the field survey showed that at least 2 330 landslides triggered by this earthquake were distributed in a rectangular area of 330 km ~ 2. Based on the GIS platform, this paper has calculated the elevation, slope, aspect, slope curvature, stratigraphy lithology, and the features of 6 PGA topography, geological and seismic parameters. The results show that the range of elevation from 2400 m to 2 600 m, the slope range from 10 ° to 20 °, the range of curvature from west to northwest, slope from -1 to -0.1, , And the peak acceleration of ground motion (PGA) of 0.16g is the multiple factor interval of Zhangxian earthquake landslide in Min County.