GIS支持下的江西省地震潜在危险度评价

Appraisal on Potential Danger of Earthquake in Jiangxi Province Based on GIS

利用G IS的定距离空间分析功能,对江西省境内分布的18条主要活动断裂周围5、10、15、20、25 km的区域分别建立缓冲区,对各缓冲区的地震活动频度和强度进行了统计,初步分析了活动断裂和历史地震的相关性,确定了沿断裂带的历史地震次数。在系统全面地分析近代所发生地震的基础上,得出地震的等烈度分布及有关参数。最后,利用空间叠加分析功能,划分了地震潜在危险性区域,得出江西省地震活动较强区域主要在赣南,其次在赣北,为江西省的防震减灾工作部署提供了定量依据。

Using equidistance space analysis function of GIS, buffer areas 5 km, 10 km, 15 km,20 km,25 km wide respectively surrounding the 18 main active faults in Jiangxi Province were set up by Geographic In- formation System （GIS） method,for each buffer area the correlation between active faults and historical earthquakes was analyzed, and the number of historical earthquakes along fault zone was determined. Based on the tectonic background of the recent destructive earthquakes, the statistical analysis was performed in determining the relationship between near -epicenter intensity and magnitude, as well as the relationship between sensible radius and magnitude. Finally, using the GIS Spatial Overlay Analysis, the Potential hazard region of earthquake was worked out, and it was concluded that the area with the most strong danger is in the south of Jiangxi Province, the north of Jinagxi Province is the next. This information provides the quantitative basis for the deployment of protection against earthquake and hazard mitigation in Jiangxi Province.