GIS技术在区域地震滑坡危险性预测中的应用——以龙陵地震滑坡为例

USE OF GIS IN REGIONAL RISK ASSESSMENT OF EARTHQUAKE INDUCED LANDSLIDES——A CASE STUDY OF EARTHQUAKE INDUCED LANDSLIDES IN LONGLING IN 1976

地震滑坡是一种有着严重危害的次生地震灾害形式,形成机制复杂,涉及因素众多。运用G IS丰富的空间分析功能,对地震滑坡的影响因素进行研究,并进行潜在地震滑坡区的预测,是地震滑坡研究领域的一种新的发展趋势。本文在对1976年龙陵地震引发的地震滑坡分布特征研究的基础上,结合前人有关中国西南地区地震滑坡特征的研究成果,应用G IS对该区潜在地震滑坡危险区进行了预测。

In West China, intense earthquakes occur frequently, because of its complex geological and geomorphological conditions, hence the earthquake - induced landslide become one of the most severe seismic hazards there. In this paper a technique for the risk assessment of seismic landslide hazard using GIS approach is developed. The method has been applied to the real case in Longling county, Yunnan Province, where a strong earthquake （M = 7.3） which triggered lots of landslides occurred in 1976. With the application of GIS, the relationships between earthquake - induced landslide activity and a number of parameters including lithology, tectonic, site intensity, slope angle, etc. are analyzed. And furthermore, the risk of seismic landslide hazard for this region is assessed using the comprehensive index method. The occurrence of landslide is the result of all factors＇ combination. In the seismic landslide hazard map generated accordingly, it is found that almost all landslides occur in the places which have been grouped as high risk areas.