【摘要】 1998年 12月 2日云南下关发生了 4 7级震群 ,大理州地震局依据地震活动、前兆异常及宏观异常情况作出了趋势、中短期和临震的预报 ;对震前的各类异常作了分析 ,探讨了预报中存在的问题。更多还原

【Abstract】 A M4 7 earthquake swarm occurred in Xiaguan,Yunnan on December 2,1998.Tendency,medium-short term and short-impending predictions had been given by Seismological Bureau of Dali Prefecture according to seismicity,precursor anomalies and macroscopic anomalies.Various anomalies before the earthquake are analysed and some problems about prediction are studied.更多还原