地震重点监视防御区县级行政单元地震危险性的差异统计及其分类管理的建议

The seismic hazard diversity of the National Significant Seismic Monitoring and Protection Regions and the suggestions of categorymanagement based on local seismic hazard characteristics

摘要:

本文利用GIS 技术，将全国地震重点监视防御区(重防区)县级行政单元边界分别与中华人民共和国地震动峰值加速度图和中国及邻区地震区带和潜在震源区划分图叠加，对各县分别计算了如下4 个地震危险性指标:(1)县境内最高地震动峰值加速度等级;(2)县境内面积比例最大的地震动峰值加速度等级;(3)县境内最高潜在震源区震级上限等级;(4)县境内面积比例最大的潜在震源区震级上限等级。通过分类统计全国重防区县级行政单元的地震危险性分布，得到的结论是:虽然同为重防区但各地的地震危险性相差巨大。据此，建议根据地震危险性的不同在重防区采取如下措施:第一，不论是何种类型的重防区，均应按中国地震动参数区划图对新建工程做抗震设防，对已有建筑做抗震加固;第二，位于高地震危险性的区域，特别是位于具7 级以上潜在地震危险的重防区，要加强与防灾有关的应急准备、城市规划、地震监测预报、地震应急响应等专门措施。

Abstract:

In this paper，we overlaid the Seismic Ground Motion Parameter Zonation Map and Potential Seismic Source Zone Map on the basis of the county borders in the National Significant Seismic Monitoring and Protection Regions，and analyzed the distribution of 4 seismic parameters among these counties: (1) the largest PGA ( Peak Ground Acceleration) in each county，(2 ) the PGA which occupies the maximum areas in each county，( 3 ) the highest Mu ( upper limit earthquake magnitude) level in each county，and (4) the Mu which occupies the maximum areas in each county． The result shows that although these counties all belong to the National Significant Seismic Monitoring and Protection Regions，they have various seismic diversities． Based on this knowledge，we finally give recommendations to administrate the seismic risk in category in the National Significant Seismic Monitoring and Protection Regions．