优化减震距离

本文对中国大陆内部不同时段发生的七级地震和六级地震分别进行统计分析,求得不同震级的优势地震间距,减震距离以及地震间距随时间变化的关系式。提出地震间距的数值分布可用正态概率分布函数描述,并得到含有时间参量的地震间距概率密度函数。此外,根据弹性位错理论,求得一次地震后在减震距离处所产生的位移,进而求出平均位移速率。

OPTIMAL DISTANCE OF REDUCING SEISMIC RISK

After a large earthquake took place, the accumulated stress and strain in focus and its neigborhood was released quite fully, so that the parallel faults in a certain range couldn''t accumulate enough stress and strain to result in a large earthquake for some time. It means that a large earthquake has an effect of reducing seismic risk of in some distance for some time. So it is important to determine the distance and buration of reducing seismic risk. This paper, on the basis of the large earthquakes occurred in mainland of China, calculated the earthquake intervals for different length of time, From these statistial data the dominant interval and the optimal distance of reducing seismic risk were got. The dominant interval and the optimal distance of reducing seismic risk are inversely proportional to length of time. The distribution of earthquake intervals can be simulated by a normal probability function. Besides, the ground displacement at the distance of reducing seismic risk was given by the elastic dislocation theory.