北天山现今活动构造的运动特征

ANALYSIS OF MOVEMENT CHARACTERS OF PRESENT-DAY ACTIVE TECTONICS OF NORTHERN TIANSHAN REGION

利用1998—2008年北天山地区近30个站的GPS观测资料,获取了研究区内现今地壳运动速度场和主要断层的活动速率。GPS运动速率表明:北天山地区的南北向地壳缩短表现为非均匀性,速度吸收的差异性表现出与该地区地震发生频度有一定的相关性;GPS测量得到的现今断裂总体活动特征与地质学推断结果一致,但量值存在差异。

Using GPS measurements in the Northern Tienshan Mountains from 1998 to 2008,we obtain the present-day crustal movement velocity field for more than 30 sites,at the same time,estimate active rates on the major faults in the studied region.The GPS velocity results show that there is non-uniformity for N-S direction crustal shortening of northern Tianshan area and it shows the correlation between the differences of the absorption rate and frequency of the earthquake occurring.The active faults movement characters derived from the GPS measurement results are consistent with the geological results,but there are differences in the value.