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本文对思茅、普洱地震区1972年——1981年期间,强震前的小震活动图象进行了分析讨论。发现,中强震前有震面积百分比逐渐增高,在达到峰值时往往有强震发生。在小震活动增强的背景上,逐渐形成小震活动空区,强震及其序列就发生在空区内。强震往往发生在小震P波初动符号呈现有规律分布——即当该地区出现优势应力场作用时。 对该地震区强震孕育、发生过程进行了初步讨论。并用付承义教授的“红肿”理论和金森博雄的“强固区”模式,对强震的发生及强震前的小震活动图象进行了解释。
In this paper, the images of small earthquakes before strong earthquakes were analyzed and discussed during the period from 1972 to 1981 in Simao and Pu’er areas. It is found that the percentage of the area of earthquake before the strong earthquakes increases gradually, and strong earthquakes tend to occur at the peak. On the background of enhanced activity of small earthquakes, a small active area of small earthquakes is gradually formed, and strong earthquakes and their sequences occur within the vacant area. Strong earthquakes often occur when the initial sign of the P wave of a small earthquake presents a regular distribution - that is, when the dominant stress field appears in this area. The earthquake occurred in the earthquake area, the occurrence of a preliminary discussion. And explained the occurrence of strong earthquakes and the images of small earthquakes before strong earthquakes with Professor Fu Chengyi’s “Red-swollen” theory and Jinshenbo Xiong’s “Strong Zone” mode.