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本文根据阚荣举等对1970—1980龙陵地区2518个小震初动符号的研究结果,讨论了应力场变化对龙陵地震的孕育、发生和衰减过程的作用。提出大地震的发生可能具有大面积的外部应力加载、特殊构造部位的应力集中、震源应力场的形成、大震发生、应力场衰减等几个环节。龙陵地区特殊的构造环境为我们提供了观察这几个环节的良好“窗口”。它造成的震源应力场与区域应力场不一致,本文提出一个解释这种现象的模式。此外,对龙陵地震发生时出现的一些特点也提出了初步看法。
According to the research results of Kan Rongju et al. On the initial signs of 2518 small earthquakes in Longling area from 1970 to 1980, the effects of stress field on the gestation, occurrence and attenuation of Longling earthquake are discussed. It is suggested that large earthquakes may have a large area of external stress loading, stress concentration in special tectonic parts, source stress field formation, large earthquakes and stress field attenuation. The special tectonic environment in Longling provides us with a good “window” for observing these aspects. The source stress field caused by it is inconsistent with the regional stress field. This paper presents a model to explain this phenomenon. In addition, some of the characteristics of the occurrence of the Longling earthquake also put forward a preliminary view.