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用模式识别方法研究了大地震的发生时间与中等地震活动性、太阳活动水平、地球自转之间的关系.由模式识别所得的性质提出,大地震前中等地震活动达到一定水平是大地震可能发生的重要性质.而太阳活动极值前后及自转加速度变化较大时段可能触发大地震.
The relationship between the occurrence time of large earthquakes and the medium earthquakes, the level of solar activity and the rotation of the earth has been studied by pattern recognition.The nature of the pattern recognition suggests that moderate earthquakes may reach a certain level before the large earthquakes, Of the important nature of the solar activity before and after the extremum acceleration and rotation of a larger period may trigger a major earthquake.