【摘要】 利用中国地壳运动观测网络工程 1999～ 2 0 0 2年渭河盆地及邻近地区GPS观测资料 ,以及陕西省地震局 2 0 0 1～ 2 0 0 2年的GPS观测资料 ,研究了渭河盆地及周邻地区地壳运动速度场 .结果表明 ,渭河盆地及邻区的运动速率有明显的北东向条带状变化特征 ,鄂尔多斯块体南缘呈整体不连续性逆时针旋转运动 ,相对鄂尔多斯块体内部的榆林测点 ,平均速率约为5 .7mm/a ;渭河盆地中部的彬县—西安—蓝田一线 ,两侧存在一个显著的左旋剪切带 ,其北部区域与铜川—泾阳—临潼—渭南小震频发区有较好的对应关系 .更多还原

【Abstract】 Based on the GPS data provided by CMONOC during 1999～2002 and observed by Seismological Bureau of Shaanxi Province during 2001～2002, we have obtained the crustal movement velocaity field in Weihe basin and adjacent regions. The results show that the motion velocity in Weihe basin and adjacent zones is characterized by distinct NE directional stripped variation. The south border of Ordos block seems to show an incontinuous anticlockwise rotation on the whole with an average velocity of about 5.7 mm·a 1 relative to Yulin site on the Ordos block. There is a left lateral shear belt on both sides of Binxian—Xi′an—Lantian zone in the central Weihe basin, and its northern area has a better corresponding relationship with the dense zone of small earthquakes in Tongchuan—Jingyang—Lintong—Weinan.更多还原