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大震前地震活动性的研究,人们进行了许多有意义的工作。早在1962年笔者在研究河源6.1级地震和日本伊豆6级地震前的地震活动性时,发现一些大地震前的地震频度与地震总数相关。此后,在邢台6.8级和7.2级地震,乌鲁木齐6.6级地震,渤海7.4级地震,炉霍6.8级和7.9级地震前的地震活动过程中,都存在类似的前兆性地震与其频度相关。其关系式是N
Earthquake activity before the earthquake research, people have done a lot of meaningful work. As early as 1962, when I studied the seismicity before the 6.1 magnitude earthquake in Heyuan and the 6th magnitude earthquake in Japan, I found that the earthquake frequency before some major earthquakes was related to the total number of earthquakes. Since then, similar precursory earthquakes have been associated with their frequency during seismic activity before the 6.8 and 7.2 earthquake in Xingtai, 6.6 in Urumqi, 7.4 in Bohai Sea, 6.8 and 7.8 Huohuo. The relation is N