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汶川地震在甘肃省触发了大量的崩塌、滑坡等地质灾害,武都区和文县的地质灾害尤为发育,占甘肃省灾害总量的75%,因此,通过灾后对地震地质灾害的现场调查和遥感解译,共获得该区地质灾害点993处。在此基础上,利用GIS技术对地震地质灾害的分布与河流水系、烈度、高程等因素的关系进行统计分析。研究得出:①地震地质灾害在区域上具有沿河流水系成线状分布的特点;②地震地质灾害密度随烈度的增加而增大;③大部分地震地质灾害分布在高程1000～2000 m的中高山地貌区;④地形坡度是地震地质灾害发育的控制性因素之一,绝大部分灾害集中在坡度10°～40°的范围内;⑤坡向对地震地质灾害的发育也有影响,正南坡向和东南坡向的地质灾害较为发育。
The Wenchuan earthquake triggered a large number of geological disasters such as landslides and landslides in Gansu Province. The geological disasters in Wudu and Hewen counties were particularly developed, accounting for 75% of the total disasters in Gansu Province. Therefore, through the field investigation of post-disaster geological disasters and Remote sensing interpretation, a total of 993 geological disasters in the area was obtained. Based on this, the relationship between the distribution of seismic geological disasters and the factors such as river system, intensity and elevation is analyzed by using GIS technology. The results show that: (1) the seismic geological disasters have the characteristics of linear distribution along the river system in the area; (2) the density of seismic geological disasters increases with the increase of the intensity; (3) most of the earthquake geological disasters distribute in the elevation of 1000 ~ 2000 m In the middle and high mountainous area; ④The terrain slope is one of the controlling factors in the development of earthquake geohazards. Most of the disasters are concentrated in the range of 10 ° ~ 40 ° slope; ⑤The aspect has influence on the development of earthquake geohazards, Geological hazards in the aspect and the southeast slope are more developed.