地震发生时地壳会发生灾难性变形 ,但是准确地预测这种破坏的原因是很困难的。分析几千次小震可以帮助我们更好地认识地震是如何发生的。在地震力学的研究中 ,一个最大的问题是确定初始条件。对断层的滑动历史和周围的初始应力场 ,很少能够确切地了解 ,以至于要搞清是什么条件 Catastrophic deformation of the crust occurs when an earthquake occurs, but it is difficult to predict accurately the cause of such damage. Analyzing thousands of small earthquakes can help us better understand how earthquakes happen. In the study of seismic mechanics, one of the biggest problems is to determine the initial conditions. It is seldom enough to know the slip history of the fault and the initial initial stress field so much as to find out what conditions