【摘要】 研究了川滇22 次 M≥6 34 级地震前区域性中强震活动变化情况。验证了某些震兆特征的客观性和普遍性。本文研究结果给出, (1) 强震前区域性中强震活动相对活跃; (2) 震源附近可能发生多次5 ～6级地震; (3) 震中周围出现5 级以上地震组成的相对活动区或活动带; (4) 震源区周围相当范围内显示平静特征。追踪区域性中强震活动变化对于预测未来较大强震的危险性有实际意义。更多还原

【Abstract】 The regional seismic activity changes about 22 earthquakes before a medium strong earthquake( M ≥634)in Sichuan and Yunnan provinces.The objectivity and universality about some precursory earthquakes were also tested.We conclude that:(1) the regional seismic activity before a medium strong earthquake is high;(2) Several earthquakes( M 5～6) may occur near an earthquake source;(3) An active relatively area or belt of earthquake forms around the future earthquake source area;(4) A quiet seismic area appears near the earthquake epicenter.Tracing the seismic changes for a medium strong earthquake is useful for the prediction of strong earthquake.更多还原