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1985年第四季度全球共发生6级以上地震25次,少于前三个季度。最大震级为 M_S7.3级。第四季度的全球地震活动水平与第三季度相比有很大下降。1985年的深、浅震频数比为1.08,比1984年明显减小。第四季度的地震活动中心位于大洋岛弧地震带,瓦努阿图群岛共发生8次强震,其中有3次7级以上地震。美洲西海岸地震带的地震活动继续向北迁移。德国—捷克边界地区发生一次小震群活动。
In the fourth quarter of 1985, there were 25 earthquakes of magnitude 6 or more in the world, less than the first three quarters. The maximum magnitude is M_S7.3. Global seismic activity in the fourth quarter has dropped significantly from the third quarter. In 1985, the ratio of deep and shallow earthquakes was 1.08, significantly lower than that in 1984. In the fourth quarter, the seismic activity center is located in the oceanic arc seismic zone. Eight strong earthquakes occurred in the Vanuatu Islands, including three earthquakes of magnitude 7 or above. Earthquake activity in the western United States seismic belt continued to migrate northward. A small swarm of war swings occurred on the German-Czech border.