云南水氡中长周期变化的统计分析及孟连7．3、武定6．5地震异常

Statistic Analysis of the Long-medium Period Variation of Radon in Groundwater in Yunnan and Anomalies about the M7.3 Menglian Earthquake and the M6.5 Wuding Earthquake

本文选择了云南地区十三个水氡观测点１９９２年９月份以来三年的数据，进行了有关处理，分离出了８０～９０天的周期变化，并发现存在地区上的差异。孟连７．３地震及武定６．５地震前，震区周围水氡出现破坏周期性变化的中期异常，时间长达十数个月。

In this paper,we processed the data of 13 radon stations since Sept. 1992 in Yunnan.The period variations from 80 to 90 days are separated from the radon observation data. We found that there are regional difference. The radon observation stations around epicentral region appeared the medium-period anomaly to destroy period variation in more than several ten months.