中国大陆地壳水平运动速度场与应变场

收集了中国大陆及周边地区GPS网的有关数据，提出了GPS网速度场的不同融合方法；经过融合建立了中国大陆及周边地区统一的地壳运动速度场，该速度场使用的有效GPS站共423个，其覆盖面积为1200万km^2；初步总结出中国大陆及周边地区地壳水平运动空间分布的基本特征；建立了板内块体的刚性弹塑性运动应变模型，对其进行了块体应变参数唯一性与速度残差中误差最小检验；根据中国大陆及周边地区的速度场，估计了8个块体的应变参数，分析了这些块体的应变状态，估计出的各个块体的应变状态与地质学、地球物理学方法估计的结果具有很好的一致性。用喜马拉雅块体主压应变方向估计的印度板块向欧亚板块碰撞力的主方向为北东7．1度。

The Velocity Fields and Strain Fields of Horizontal Crust Motion of the Mainland of China

The related data from the GPS networks in the mainland of China and the surrounding areas were collected,and different methods for combining velocity fields of GPS networks were put forward;the unified velocity field of crustal motion of the mainland of China and the surrounding areas was established through combination,altogether 423 effective GPS stations were used for the velocity field,covering an area of 12 million square kilometers;the basic characteristics of spatial distribution of horizontal crust motion of the mainland of China and the surrounding areas were sumed up;the strain patterns of rigid and elastic plastic motion of intraplate blocks were established,which have been tested for the sole block strain parameter and the minimum median error of velocity residual on the basis of the velocity field of China's mainland and the surrounding areas,strain parameters of the eight blocks were estimated,the strain states of these blocks were analysed,the estimated strain states of the blocks were well consistent with that estimated by geological and geophysical methods.The principal direction of the impact force of the Indian block on the Eurasian plate,which was estimated according to the direction of principal compressive strain of the Himalayan block,is at 7 1 degrees northeast.