云南定点倾斜异常与强震关系研究

THE RELATION STUDY BETWEEN THE ANOMALY OF THE FIXED POINT TILT AND THE STRONG EARTHQUAKES IN YUNNAN

采用速率合成和趋势合成两种方法对云南定点形变倾斜观测资料进行了处理,旨在提取形变准同步群体异常的信息,分析研究倾斜与强震关系。结果表明:云南强震前1-2年形变场的群体异常信息较为显著,对云南地区强震的中期预测有一定的效能,倾斜南北向的观测变化结果对强震的反映优于东西向。

Adopting two methods of the rate synthesis and the trend synthesis, we handled with the observed data of the fixed-point deformation tilt in Yunnan in order to draw out some information of the quasi-synchronous group anomalies about the deformation and analyse the relation of the tilt and the strong earthquakes. The result shows that the information of the group anomalies in the deformation field is marked before the strong earthquakes of Yunnan. It has a certain efficacy of the mid-term prediction to the strong earthquakes of Yunnan. The observed variance of the direction NS is superior to one of the direction EW about the tilt in reflecting the strong earthquakes.