新疆天山地区定点形变群体异常特征与地震活动

Grouping characteristics of fixed point deformation anomaly and seismicity in the Tianshan area of Xinjiang Region

利用定义的形变异常密度和趋势分析法研究了 1 990～ 2 0 0 0年新疆天山地区定点形变异常的时空分布、群体异常特征及与中强地震活动的关系。结果表明 ,各分区形变资料显示的高密度异常在时间上与 b值异常有一定的相关性 ,与该地区的中强地震活动有较好的对应关系 ;一组中强地震前 2～ 4年能观测到形变趋势项的转折。

The relation between the time-space distribution and grouping characteristics of the fixed point deformation anomaly as well as the activity of moderately strong earthquakes in Tianshan region in 1990～2000 was studied by using deformation anomaly density defined in the paper and trend analysis method. It is thought that the high density anomaly observed in every sub-area has a certain relation with value b in time and a good correspondence to the activity of moderately strong earthquakes in the area; the turning and accelerating deformation variations of long-term trend can be observed in 2-4 years before a group of moderately strong earthquakes.