天山现今地壳运动的形变场分析

对天山地区GPS测量成果进行系统处理，获得了整体天山相对于欧亚大陆的现今地壳运动的212个GPS站速度场结果，再现了受印度板块向北推挤作用下天山地区相对欧亚板块的水平构造变形分布状态。天山地区GPS速度场表明，天山地壳缩短由南向北、由西向东递减，表明板块的推挤作用力随着天山的褶皱变形相应减弱；西天山的变形强于东天山的主要原因可能是西部帕米尔高原对天山的直接俯冲推挤作用的结果；而东天山的构造活动则是塔里木块体对其缓慢推挤的结果。

ANALYSIS OF PRESENT-DAY CRUSTAL DEFORMATION OF TIANSHAN

In this paper,we have processed the GPS data of 212 monitor stations and obtained GPS solution result about present-day crustal movement velocity field of whole Tianshan area relative to Eurasia plate. GPS velocity field results indicate the horizontal tectonic deformation of Tianshan area under the northward push-compressional action of the India plate and the Tianshan's crust shortening decreses gradually from south to north and from west to east.It reflects that the push-compressional force along with the fold deformation of the Tianshan becomes weaker.The main cause that western Tianshan's deformation is stronger than that of the eastern Tianshan may be that in the west the eastward direct subduction-compression of Pamir plateau is stronger than the westward slow compression of the Tarim block.