基于GIS的构造单元地震空间分形研究——以四川省和重庆市为例  

On Seismic Spatial Fractal Research of Tectonic Units Based on GIS——Taking Sichuan Province and Chongqing Municipality as an Example

作　　者：甘芬芳 徐刚[1] 徐羽[1] 吴艳飞[1] 杨姝漫 

机构地区：[1]西南大学地理科学学院,重庆400715

出　　处：《西南师范大学学报（自然科学版）》2015年第6期80-84,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(41372177);重庆市社会科学规划项目(2010QNZH32)

摘　　要：根据分形理论和方法,利用四川省和重庆市1950年1月—2009年9月(震级≥4.0)的地震数据和川渝地区大地构造图,计算一级和二级构造单元内地震空间分布的信息维,并对地震空间分布及其分维值与大地构造单元的关系进行讨论,结果显示:1川渝地区的一级和二级构造单元内的地震空间分布具有分形结构,二级构造单元的地震空间分布分维值差异比一级构造单元更明显;2地震空间分布分维值大小与构造单元内地震发生的次数没有互相对应的关系,而与地震点空间分布密度呈现显著的正相关关系;3地震空间分布分维值与构造单元复杂程度、地壳活动强弱之间有较好的联系,其信息维是构造单元活动性强弱的定量指标.According to fractal theory,primary and secondary structural elements have been studies within the information-dimensional spatial distribution of earthquakes by means of the seismic data of Sichuan Province and Chongqing Municipality from January 1950 to September 2009（magnitude≥4.0）and tectonic units in Sichuan Province and Chongqing Municipality.And the relation between spatial distribution of earthquakes,fractal dimension value,and tectonic units has been discussed.The results show that 1）Sichuan Province and Chongqing Municipality have fractal structure in the primary and secondary tectonic unit.The difference of seismic point relations dimension spatial distribution in the second-order tectonic units is more pronounced than first-order tectonic units.2）There is no corresponding relationship between earthquake spatial distribution fractal dimension values and the number of the earthquake in tectonic unit.But it has a significant positive correlation with spatial distribution density.3）In total,earthquake spatial distribution fractal dimension values have a better link between the complexity of tectonic units and the activity of crustal motion the earth,which has information dimension as a quantitative indicator.

关 键 词：空间分形 地震活动 信息维 构造单元 断裂带 川渝地区 

分 类 号：P315[天文地球—地震学]