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2013年4月20日,四川省芦山县发生了M S7.0地震。文中简要介绍了芦山地震的基本情况与芦山地震区历史地震及其相关地震滑坡情况。依据2008年汶川地震滑坡与地震动峰值加速度(PGA)的空间关系,对芦山地震滑坡大体分布范围进行了推测。根据地震滑坡分类学,将芦山地震滑坡分为破坏型滑坡、连贯型滑坡、流滑型滑坡3大类。其中,破坏型滑坡包括岩质崩塌、岩质滑动、岩质崩滑、土质崩塌、土质滑动等5类;连贯型滑坡包括土质坍塌与慢土流2类;流滑型滑坡为快速流滑。破坏型滑坡如岩质崩塌、岩石滑动、土质崩塌这3类是芦山地震滑坡中最常见的类型。基于震后可利用的高分辨率航片,初步解译得到3 883处滑坡位置点数据。最后,从余震对滑坡的影响,芦山地震滑坡与邻区地震滑坡对比分析,对后续基于高分辨率遥感影像的滑坡精细解译的启示等3个方面开展了分析与讨论。
On April 20, 2013, an M S7.0 earthquake occurred in Lushan County, Sichuan Province. This paper briefly introduces the basic situation of Lushan earthquake and the history of Lushan earthquake and related earthquake landslides. According to the spatial relationship between the 2008 Wenchuan earthquake and the peak acceleration of ground motion (PGA), the general distribution range of the Lushan earthquake landslide is speculated. According to the classification of earthquake and landslide, the landslides of Lushan earthquake are divided into three categories: destructive landslide, consecutive landslide and landslide. Among them, the destructive landslide includes 5 types of rock mass collapse, rock slide, rock collapse, soil collapse and soil slide; the continuous landslide includes two types of soil collapse and slow soil flow; the slippery slide landslide is rapid flow slip. Destructive landslides such as rock collapse, rock sliding, soil collapse of these three categories is the most common type of Lushan earthquake landslide. Based on the available high-resolution aerial photographs after the earthquake, 3,883 landslide location data were initially interpreted. Finally, the impact of aftershocks on the landslide, the comparative analysis of Lushan earthquake landslide and adjacent landslides, and the enlightenment of the subsequent fine interpretation of landslides based on high-resolution remote sensing images are analyzed and discussed.