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 ---T aking Sichuan Province and Chongqing M unicipality as an Example
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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．Abstract: 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 M unicipality from January 1950 to September 2009 (magnitude ≥4 .0) and tecton‐ic 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) Si‐chuan Province and Chongqing M unicipality have fractal structure in the primary and secondary tectonic u‐nit .T he difference of seismic point relations dimension spatial distribution in the second‐order tectonic u‐nits 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 ac‐tivity of crustal motion the earth ,w hich has information dimension as a quantitative indicator .
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