云南M≥5地震震前异常的统计特征*
付 虹,李永莉,赵小艳,刘丽芳

(云南省地震局,昆明 650224)

震例分析; 异常特征; 地震预报; 云南

Statistical Characteristics of the Anomalies before the M≥5 Earthquakes in Yunnan Region
FU Hong,LI Yong-li,ZHAO Xiao-yan,LIU Li-fang

(Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

analysis of earthquake case; anomaly characteristic; earthquake prediction; Yunnan

备注

通过对1970年以来云南38组M≥5地震震前异常的综合分析,得到云南5级以上地震的异常共性特征:震前小震频度普遍增强; 6级以上地震的异常持续时间比5级地震长; 异常分布越广可能未来地震的震级越大; 部分前兆观测项目趋势异常结束、新的突变异常增多,是地震孕育进入短临阶段的标志。

We synthetically analyzed the anomalies before the 38 groups of earthquakes(M≥5)since 1970 in the Yunnan region,and obtained the common characteristics of the anomalies.The frequency of small earthquakes usually increases before the earthquakes(M≥5); the durations of anomalies of M≥6 earthquakes are longer than those of M5-6 earthquakes; the wider the anomalies distribute,the bigger the magnitude of the earthquake(M≥5); the ending of some tendentious precursory anomalies and the increasing of new abrupt anomalies can be considered as the sign of the earthquake preparation going into short-term and impending-earthquake period.