天山地区近期地壳形变研究

Research on the Recent Crustal Deformation in Tianshan Area

利用1999-2019年GPS连续站及流动站观测资料,计算了天山地区的时间序列及速度场结果,在此基础上,通过GPS速度场分析、GPS剖面分析、应变时间序列分析来获取天山地区地壳变形运动特征。结果表明两期速度场变化不大,天山北部地区表现为速率值的变小,天山南部地区显示出速率方向有向北的细微变化;南天山的挤压速率明显大于北天山的挤压速率,说明板块的推挤作用力随着天山的褶皱变形相应减弱;南天山地区的挤压应变明显较强,可能会有应变的积累导致地震的发生,值得进一步注意。

Based on the observation data of GPS continuous stations and mobile stations from 1999 to 2019,we calculated the time series and velocity field results of Tianshan Area.On the basis of this,we obtained the crustal deformation and movement characteristics of Tianshan Area through GPS velocity field analysis,GPS profile analysis and strain time series analysis.The results show that the velocity in the northern part of Tianshan Area changes little,while the velocity in the southern part of Tianshan Area changes slightly to the north.The compression rate of southern part of Tianshan Area is significantly higher than that of the northern part,indicating that the pushing force of the plates decreases with the folding deformation of Tianshan Area.The compression strain in the southern part of Tianshan Area is obviously strong,and the accumulation of strain may lead to the occurrence of earthquakes,which deserves further attention.