姚安6.5级地震前云南倾斜场变化特征

对姚安6．5级地震前云南地区的地倾斜进行了系统的分析研究，论述了震前前兆信息的异常特点，总结了震前倾斜场的异常变化特征：1、异常幅度大、异常面积广；2、趋势性异常地域相对集中；3、短临异常出现的时间相对集中；4、震前异常具有明显的阶段性；5、异常方向具有一定的指示性。最后对倾斜观测及地震预报作了相关的讨论。

The Variation Characteristics of the Tilt Field in Yunnan before the Yaoan Earthquake M6.5

A systemic analysis has been made to the tilt data in Yunnan region before the Yaoan earthquake M6.5. It has discussed the anomalous chaacteristics of the precursory information before an earthquake and summarized the variation characteristics of the anomaly in the tilt field. The bigger the anomalous amplitude the wider the anomalous area. The region of tendecy anomaly is relatively concentrated. The appearing time of short-impending anomalies is relatively concentrated. The anomaly before the earthquake has an obviously staggered feature. The anomalous direction has some indicative. Finally, some discussions have been made to the tilt observation and earthquake prediction.