1995—1996年云南孟连西,武定,丽江三次强震前的地震活动背景性异常

分析了１９９５￣１９９６年发生的云南孟连西７．５级、武定以北６．５级和丽江以北７．０级三次强震前云南及邻近地区出现的地震活动背景性异常，包括地震空区、条带、小震群活动、地震窗口、诱发地震、强震原地复发以及迁移等特征。对地震活动期的分析表明，１９８８年澜沧－耿马地震后云南地区处于强震活动高潮期，１９９３年区内发生５．０￣６．３级地震７次，达到发生７级以上强震的预报指标。这些地震活动背景异常为这３次强

THE SEISMICITY BACKGROUND ANOMALIES BEFORE THREE STRONG EARTHQUAKES MENGLIAN,WUDING AND LIJIANG IN YUNNAN FROM 1995 TO 1996

It is remarkable that the seismicity background anomalies in Yunnan region before the three strong earthquakes.The anomalies are seismic gap,seismic belt,small earthquake swarm,seicmic window induced earthquake,strong earthquake recurrence and migration of strong earthqauke and so on space distribution.Yunnan is being the peak period of seismic activity,after Lancang-Gengma with M s7 6,7 2 in Nov.1988,two strong earthquake with M S 6 7 and 6 8 occurred on the border of Ximeng county of Yunnan province and Burma.There are seven times midium_strong earthquakes whose magnitude are from M S 5 0 to 6 3 occurred in Yunnan in 1993.It was up to the index to forecast large earthquake M S>7 0.So,these anomalies suppled scientific bases for predicting large earthquake M S>7 0 successfully.