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本文从统计的角度对云南及邻近地区廿余年六十次中强地震进行了研究,发现这些地震前在震源区或近震源区一般都有4级左右地震发生,而它们与主震的间隔时间也不长,一般多在三个月左右,从而认为这些4级地震具有明显的短临前兆意义。同时,又从另一侧面分析了与这些4级左右地震有关联的其它震兆特征,并把它们作为短临判别条件。这就使我们可能把4级地震作为中强地震发生前的重要短临判据之一。
In this paper, from a statistical point of view, we have studied 60 moderate-strong earthquakes of more than 20 years in Yunnan and its adjacent areas and found that there are generally about 4 earthquakes in the source area or near source area before these earthquakes, Not long, usually more than three months, so that these 4 earthquakes have obvious short-term precursor significance. In the meantime, the other characteristics of earthquakes associated with these earthquakes of magnitude 4 are analyzed from the other side, and they are used as short-term discriminant conditions. This makes it possible for us to consider the magnitude 4 earthquake as one of the major short-term criteria before the occurrence of the mid-strong earthquake.