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2008年3月21日新疆于田发生M_S7.3级地震.本文通过处理、分析GPS数据,得到破裂断层北侧100 km附近的同震位移及震后形变信息.在观测区域GPS点监测到10 mm左右的同震位移,其中最大为南向14 mm,东向5 mm.同震位移呈现一致性的东南向运动特征,证实于田地震存在显著的左旋走滑分量.震后台站向西南方向运动,与同震位移方向不同,说明同震位移和震后形变具有不同的形变源.近普鲁断裂两侧的GPS点震后运动方向存在明显差异,表明于田地震可能触发了普鲁断裂的左旋滑动.普鲁断裂在于田地震发生后呈现的构造活动特征揭示普鲁断裂是康西瓦西阿尔金断裂带的一部分,兼具左旋走滑与逆冲分量,吸收了青藏高原西北缘相对于塔里木盆地的东向逃逸与北向入侵作用.
The M_S7.3 earthquake occurred in Yutian, Xinjiang, on March 21, 2008. In this paper, the co-seismic displacements and post-earthquake deformation near 100 km to the north of the ruptured fault are obtained by processing and analyzing the GPS data.When 10 mm, with the maximum of 14 mm in the south direction and 5 mm in the east.The co-seismic displacements show a consistent southeastward movement characteristic, confirming that there is a significant left-lateral strike-slip component in the Yutian earthquake.After the earthquake the station moved southwestward Which is different from the coseismic displacements, indicating that coseismic displacements and post-earthquake deformation have different deformation sources.The GPS motions on both sides of the near Prussian fault show significant differences in post-earthquake motion directions, indicating that the Yutian earthquake may trigger the Prussia The tectonic movement characteristics of Prus fault after the earthquake in Tian revealed that Prus fault is a part of the Altyn Tagh fault in the Kangxiwa area and has both left-lateral strike-slip and thrust components and absorbs the northwestern margin of the Qinghai-Tibet Plateau East Tarim Escape and Northward Intrusion in Tarim Basin.