运用GIS分析安徽省六安市地震次生地质灾害危险性

STUDY ON DANGER OF SEISMIC SECONDARY GEOLOGY DISASTER IN LIU'AN CITY OF ANHUI PROVINCE BASED ON GIS

将层次分析方法运用到地震次生灾害评价中,结合GIS技术,运用多源数据,以潜在地震次生地质灾害为例,选取灾害发育的主要控制性影响因素,包括致灾因素、诱灾因素、历史因素,建立地震次生地质灾害评价指标体系,并建立五级评分值标准。在此基础上利用GIS方法对基础资料进行处理和分析,通过统计、叠加、合并、分类等空间分析方法,得到地震次生灾害危险性等级评价结果。结果表明:六安地区的地震次生地质灾害危险性总体呈现从南到北递减的阶梯型分布特征。其中,较高的地区主要集中在金寨、霍山和舒城县的侵蚀中低山和剥蚀丘陵地区,且以活动断裂分布中心向两侧递减。

In this paper,the analytic hierarchy process is applied to the evaluation of seismic secondary disasters,combined with GIS technology,use of multi-source data,for a case of potential earthquake secondary geological disasters,selected main control factors of hazards including induced causingdisaster factors,inducing factors and historical factors,establish the evaluation index system of seismic secondary disasters and establish five grades standard value.In this basis,the basic data are processed and analyzed by using GIS method,and the results of risk assessment of secondary disaster are obtained by the methods of statistics,superposition,consolidation and classification.The results showed that the risk of secondary geological hazards in the Lu＇an area was generally characterized by the stepwise decreasing from the south to the north.Among them,,the higher areas are mainly concentrated in Jinzhai,Mount Holyoke and Shucheng County in the erosion of low hills and erosion hilly areas,and to the active fault distribution center to both sides.