新疆天山地区定点形变群体异常特征与地震活动

利用定义的形变异常密度和趋势分析法研究了1990~ 2000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、加速等变化。

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

The relation between the time-space distribution and grouping characteristics of the fixed point deformation anomaly as well as the activity of moderately strong earth-quakes in Tianshan region in 1990~ 2000 was studied by using deformation anomaly densi-ty defined in the paper and trend analysis method. It is thought that the highdensity anomaly observed inevery 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 be-fore a group of moderately strong earthquakes.