利用GPS资料采用非连续变形分析模型确定中国大陆地壳运动速度场

The Establishment of Crust Motion Velocity Field of China by GPS Observations and Spherical DDA Model

利用近 10年来我国先后建立的多个大规模高精度GPS地壳形变监测网资料 ,科学合理地计算出各GPS站点的速度值。采用球面非连续变形分析 (DDA)模型 ,以GPS观测得到的速度值为约束 ,拟合出了中国大陆现今地壳运动的速度场。它不仅客观地描述了地壳运动的刚性成分 ,也客观地描述了块体内部的变形 ,并且具有物理意义。该速度场模型较地质构造速度模型、离散点速度模型、刚体转动速度模型。

Establishing the scientific and reasonable velocity figure of the China Continent crust motion is a basic work in recent crust motion research.In this paper,using multitudinous high precision GPS data of crust deformation surveying network established in recent ten years in China,velocity of every GPS station is scientifically and reasonably calculated.Then the China Continent velocity field is established,by using the spherical discontinuous deformation analysis (DDA) model.The velocity field does not only objectively describes the rigidity factor of the crust motion,but also objectively characterizes the inner deformation of the continent. This velocity field model has obvious superiority to the geologic structure velocity model,the discrete point value model,the rigid_body rotation velocity model and the collocation simulation velocity model.