中文摘要：

研究断层系统中局部断层破坏过程中事件释放能量的大小、事件的尺寸及断层活动顺序对于地震及矿震等自然灾害的预防具有重要意义.本文考虑了事件的尺寸,对Z字形断层系统中一些量的演变规律进行了统计.研究发现,各条断层上事件的数目小于剪切破坏单元的,二者具有类似的变化规律;位于标本中部的断层B上事件的最大尺寸变化晚于折拐断层A＋D上的,更晚于长且平直断层C上的,但增加非常迅速,断层C和A＋D的破坏造成了断层B的破坏,反过来,又引起了自身的进一步破坏,这类似于一个正反馈过程;标本中事件的b0值（事件的频次-能量释放关系的斜率的绝对值）先增后降,直到趋于稳定;在不同断层上,释放高能量的大事件的数目和尺寸可以小,也可以大;在某条断层上,释放高能量的大事件的数目和尺寸较大.通过对各条断层上大事件释放能量的统计,获得了断层的活动顺序.

英文摘要：

Studies of the released energy of events, the size of events, and the sequence of fault activities during the process of fault failures of a fault-rock block system are significant for natural hazards＇ preventions and predictions. The size of events is considered, and some statistical quantities are obtained for a Z- shaped fault. It is found that the number of events is less than that of elements due to shear failures at each fault, and the two quantities have a similar evolution. For the middle fault B in the Z- shaped fault, the change of the maximum size of events is later than that for the bending fault A ＋ D, and even later than that for the long and straight fault C, however, the change of the maximum size of events is rapid. The failures of faults C and A ＋ D lead to failures of the fault B, leading to further failures of themselves. It is similar to a positive feedback process. The b0 value （ the absolute value of the slope of the relationship between frequency and released energy） of events for the Z-shaped fault first increases and then decreases until a stable value is reached. At different faults, for large events releasing high energies, the number of large events may be few or great and the size may be large or small. At each fault, the number and size of large events releasing high energies are great and large. The sequence of fault activities is obtained based on statistics of large events.