【摘要】 利用东北地区37个GPS测站1997~2005年的观测数据研究了该区现今地壳形变特征。结果显示:东北地区相对欧亚板块的位移速率矢量较小,平均为1.58mm/a,表明该区总体上比较稳定;有5个测站的水平位移速率在95%的置信水平上具有显著性,而其他测站则并不显著;辽西地区的几个测站显示出一致性的东南运动,可能是青藏高原东向运动的远程效应;靠近1999年Mw7.1和2002年Mw7.3深源地震震中的测站速率较小,说明这两次深源地震对地表造成的形变并不明显。黑龙江东北部测站运动可能反映了北美板块向南楔入对欧亚板块的影响。更多还原

【Abstract】 The present-day crustal deformation in the northeast China is studied with GPS data of 37 stations during 1997-2005. The velocities related to Eurasia is generally small, 1.58 mm/a on average, it is showing that the region is generally stable. Horizontal velocities of 5 stations appear to be significant at 95% confidence level, however other stations show insignificant motion. Several stations in the southwestern corner of the studied region are consistently moving towards the southeast, this is most probably a distant effect of the eastward motion of Qinghai-Tibet plateau. Small velocities of the stations near the epicenters of the 1999 Mw7.1 and 2002 Mw7.3 deep-focus earthquakes in Wangqing county,show that the 2 earthquakes did not cause broad deformation of shallow crust. The horizontal velocities of the stations in the Northeastern Heilongjiang province may reflect the effect of the North America plate’s invasion on the Eurasia plate.更多还原