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分析大地震前小地震时、空分布发现,1973年2月6日炉霍7.9级地震1974年4月22日溧阳5.5级地震及1976年5月29日龙陵7.3级地震前约3个月内,2级以上小地震有沿一定方向(顺时或逆时)逐个发生,从而形成环的现象。溧阳和龙陵地震发生在环内一侧或其附近,而炉霍大地震则离环较远,但处于同一构造带。根据蠕变曲线有非线性增加段及其时间特征,它可定为短期前震,並且可能表现了震前固体潮触发蠕滑的过程。
When analyzing the small earthquakes before the great earthquake, the spatial distribution shows that the magnitude 7.0 earthquake on February 6, 1973, with a magnitude of 7.0, an anomaly of magnitude 5.5 before the Liyang M 5.5 earthquake on April 22, 1974 and a magnitude 7.3 Longling earthquake on May 29, 1976 In the case of earthquakes of magnitude 2 or above, the earthquakes occur one by one in a certain direction (clockwise or counterclockwise). The Liyang and Longling earthquakes occurred at or near the ring, while the Huohuo Earthquake was far away from the ring but was in the same tectonic belt. According to the nonlinear increase of creep curve and its time characteristics, it can be regarded as a short-term foreshock, and may indicate the process of triggering creep of solid tide before the earthquake.