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1986年第四季度全球又发生了两次震级大于7~3/_4的a级大地震,成为全年中地震活动水平最高的时段;1986年的全球地震活动水平明显超过1985年而更接近峰值。全年深、浅震频数比经历了较大的起伏,总体上与1985年基本相同。东半球与西半球相比明显“缺震”。1987年全球地震活动的趋势引人注目。
In the fourth quarter of 1986, another a-magnitude earthquakes of magnitude greater than 7-3 / 4 occurred again in the world, becoming the period with the highest level of seismic activity throughout the year. The level of global seismicity in 1986 was significantly higher than that of 1985 and closer to the peak . In the whole year, the ratio of deep and shallow earthquakes experienced great ups and downs, which is basically the same as that of 1985. Compared with the western hemisphere, the eastern hemisphere obviously “lack of shock.” The trend of global seismic activity in 1987 attracted much attention.