基于分形维的龙门山断裂对震后次生山地灾害 控制的定量研究—以北川县为例*

利用几何分形学的方法,测算了北川县及邻区区域内龙门山断裂的总体分形维和各分带的分形维.再分别对研究区灾害点分布进行总体分形维和各分带分形维测算.通过分析分形维测算结果以及灾害点分布密度,结果表明,断裂带各分带的分形维差异很好的体现了龙门山断裂的构造变形特征.并与各分带的灾害点分布密度呈正相关关系;灾害分布分形维是灾害点分布均匀程度的体现,与断层分布的复杂程度和灾害点分布密度无关.定量的证明了断层分形维、灾害分布分形维和灾害分布密度三者的关系,成功的以定量的形式分析了龙门山断裂对震后次生山地灾害分布的控制.

Quantitative Research the Earthquake-induced Geohazard Controlled by Longmenshan Faults after Earthquake Based on the Fractal-Examplified by Beichuan County*

The fractal dimension of Longmenshan fault around the Beichuan county and the hazards-point of different zone of Longmenshan fault is calculated by using fractal.The results showed that the fractal dimension of the different zone of Longmenshan fault well reflect the tectonized charactics of the faults,and it is positively correlated with the secondary hazards-point distribution density of different zone of Longmenshan fault;the fractal dimension of the secondary hazards-point distribution is not fully cons...