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分析了我国约五十年来发生的28个大震的余震序列。指出: 1、对于主-余震型地震序列,其强余震的“等待时间”(该强余震距上次强余震的时间)Δt与它的发生时间(距主震的时间)t遵从对数——对数线性关系: 其中:A≈0.92,B≈-0.11。 2、对于双主震或主震群型的地震序列则只有在最后一个主震发生后,Δt和t才有上述关系。 文中对上述特点在判断地震类型及预报强余震震中的应用,作了初步讨论。并利用流变学和断裂力学的观点,对这一现象作了初步的理论解释。
The aftershock sequence of 28 major earthquakes happened in about 50 years in our country was analyzed. Points out: 1 For the main-aftershock-type earthquake sequence, the “waiting time” of the strong aftershock (the time of the strong aftershock from the last strong aftershock) Δt and its occurrence time (the time from the main shock) - Logarithmic linear relationship: Where: A≈0.92, B≈-0.11. 2. For the earthquakes with double mainshocks or mainshock swarms, Δt and t have the above relationship only after the occurrence of the last mainshock. In this paper, the characteristics of these in determining the type of earthquake and prediction of strong aftershocks epicenter, made a preliminary discussion. And made use of rheology and fracture mechanics point of view, made a preliminary theoretical explanation of this phenomenon.