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1984年5月21日南黄海发生6.2级地震,其余震活动逐渐衰减,并似有倍九日期的特点。主震发生后,在24小时内发生了3.8级和3.7级二次较大余震,直到5月30日,即主震后第一个九天,发生了3.7级余震,以后每逢倍九日期都发生了较大余震,直至主震后第七个九天,即7月24日凌晨,发生了一次最大的强余震,震级为4.9级(见表)。在南黄海6.2级地震后,第一、第二个倍九日期发生了较大余震,当时我们观测到余震活动可能存在着倍九特征,运用这个特点并在尔后的监视余震活动中发挥了作用。
On May 21, 1984, a 6.2 magnitude earthquake hit the southern Yellow Sea, and the activity of other aftershocks gradually decayed. After the occurrence of the main shock, 3.8 second magnitude and 3.7 second larger aftershocks occurred within 24 hours, and aftershocks of magnitude 3.7 occurred on May 30, the first nine days after the main earthquake. After that, A large aftershock took place until the seventh major nine days after the main shock, that is, on the early hours of July 24, the largest strong aftershock of 4.9 magnitude occurred (see table). After the M6.2 South Yellow Sea earthquake, a large aftershock occurred in the first and second times of 9th. At that time, we observed that there may be a factor of 9 in aftershock activity. By using this feature, we can play a role in monitoring aftershock activities .