2007年6月3日云南宁洱6.4级地震异常特征分析

THE ANOMALY CHARACTERISTICS ANALYSIS OF NING'ER 6.4 EARTH-QUAKE ON JUN.3,2007,IN YUNNAN PROVINCE

通过对2007年6月3日滇西南宁洱6.4级地震前地震活动和前兆异常跟踪，震前对该地震作了短期预测。宁洱6.4级地震前，云南和滇西南地区的6级、5.8级以上地震出现了长时间的平静，显示了能量的积累过程；中期阶段4.5-5.0级地震在震中区周围形成了地震密集区，中、短期阶段滇西南地区Ms≥3地震活动显著增强并形成空区，空区长轴250km，计算震级为6.37，这与实际发生地震震级完全一致。滇西南地区的前兆异常显示，距离震源区近的以趋势异常为主，外围异常以突变为主。

Through tracking the earthquake activity and precursory anomalies before Ning＇er Ms6.4 earthquake on Jun.3, 2007, the short-term prediction was done before the earthquake. There was long period Ms6.0, Ms5.8 earthquake calmness in Yunnan and south-west area of Yunnan province; Ms4.5 to Ms5.0 earthquakes formed seismic concentrating region around the epicentral area in the mid-term; M3.0 earthquakes activity increased evidently and formed seismic gap in mid-short term. The magnitude calcucated from the seismic gap was 6.37, accordant with the occurred earthquake. The precursor anomalies showed that there were mainly trend anomalies near the hypocentral region, but sudden change anomalies in the outer area in south-west area of Yunnan province.