经验格林函数方法理论上的改进

以往的经验格林函数方法存在着两个问题:一是要求大小地震需满足"相似"或"准相似"条件,这就限制了经验格林函数方法的适用范围。二是对大地震断层面的位错不均匀性考虑得不充分,而实际上大地震断层的位错一般是不均匀的。本文在假定大小地震不满足"相似"和"准相似"以及大地震断层面位错不均匀的前提下,对经验格林函数方法进行了改进,并应用于卢龙地震的模拟,模拟的结果与记录符合得比较好,说明改进的经验格林函数方法可以用来估计场地地震动过程。

The improvement of empirical Green' s function method in theory

There are two disadvantages in previous empirical Green’s function.The one is big and small earthquakes must satisfy "similarity conditions" or "quasi-similarity conditions",which limits the application ranges of this method.The other is there is a lack of consideration about the dislocation’s unevenness at large earthquake faults,actually,slip dislocations at earthquake faults for large earthquakes are usually uneven.On the basis of that big and small earthquakes do not satisfy "similarity conditions","quasi-similarity conditions" and the slip dislocations at earthquake faults for large earthquakes are usually uneven.The paper puts forward an improved empirical Green’s function,and simulates the ground motion of Lulong with improved method.The simulations with this method accord well with records,so improved empirical Green’s function method can be used to estimate ground motion processes.