1998年宁蒗6.2级系列地震的短临前兆异常特征

与以往的震例相对相对比，１９９８年宁蒗６．２级地震的短临前兆异常，既有异常幅度大，空间分布上受活动性断裂带控制，时间进程上是准同步起伏，前兆异常与震兆异常配套出现，策观异常与宏观异常配套出现等共性；又有前兆异常十分丰富，异常的空间分布集中，震后效庆十分平衡等个性。

Short-impending anomaly characteristics on a series of M6-2Ninglan earthquakes,1998

Compared with the earthquakes before,the short-impending anomalies of Ninglan M 6 2 earthquake have following characteristics:the amplitudes of anomaly are big;the distribution of anomaly is controlled by the active seismic faults;many anomalies present a quasi-synchronized fluctuation in time courses;premonitory anomalies appear synchronously with the seismic anomalies;micro-anomalies and macro-anomalies occur together At the same time,the premonitory anomalies abound,the seismic situation becomes quiet immediately after the earthquake