青藏块体东北缘及其周围地区现今时空运动变形特征

The Present Motion and Deformation Features with Spatial-Time of the Northeastern Margin of the Qinghai-Tibet Block and Its Adjacent Area

依据非连续变形分析 (DDA)方法 ,考虑特定块体边界不同程度的适度侵入 ,利用 3期GPS观测资料 (1991、1999、2 0 0 1年 ) ,建立了青藏块体东北缘及其周围地区的一级块体运动模型和划分较细的、反映较小区域运动变形的较理想块体运动模型。模拟得到了研究区内北西西向大断裂间一级块体的运动变化特征、研究区主应变率场的分布特征及青藏块体北边界断裂的分段非均匀时空运动特征。

On the basis of the discontinuous deformation analysis, considering the invading of specific block boundary to different extent, the first-order block motion model is found in the northeastern margin of the Qinghai-Tibet Block by the GPS observations(1991,1999 and 2001), and the detailed model of displaying small region motion deformation is found too. By simulating, we got the motion features of first-order blocks between big WWN faults, the distributing features of main strain field and the no-equality subsection motion features with spatial-time of the Qinghai-Tibet Block north-boundary fault.