中国大陆水平运动特征与动力学分析

Characteristics of horizontal movement in China′s continent and geodynamic analysis

提出了将不同 GPS网融合为一体的方法 ,实现了中国大陆 4个高精度 GPS网的融合 ,并据此获得了中国大陆及周边地区水平运动的速度场 ,以及北向与东向分量场的等值线图。在全球框架下 ,中国大陆及周边地区存在明显的向东运动趋势 ;中国大陆西部与东部 SN向运动的方向相反 ;西藏高原东部是中国大陆地壳运动最强烈的地区 ;中国大陆水平运动方向为同出于一源的一束放射状弧线。根据中国大陆地壳水平运动的特征 ,分析了中国大陆周围的动力学环境 ,并对各板、地块对中国大陆作用力的大小进行了概略估计。表明印度板块对中国大陆碰撞力最大 ,其次是菲律宾海板块对中国大陆的俯冲力。

In this paper, a method to synthesize different GP S networks has been proposed, and by using this method, synthesis of 4 high-precision GPS networks i n China′s continent have been realized. The velocity field of horizontal moveme n t and the contour map of N and E-trending component fields in China′s continen t and the surrounding areas have obtained. Under the global frame, China′s contin e nt and the surrounding areas have an obvious eastward movement. The directions o f NS-trending movements are opposite in the western and eastern part of China′ s continent. The eastern part of Xizang plateau is the area with the most intensiv e crustal movement in China′s continent. The direction of horizontal movement i n China′s continent likes a beam of radial arc lines with the same origin. Based on the characteristics of horizontal crustal movement in China′s continent, the geodynamic environment around China′s continent has been analyzed, and a rough e stimation has been made for the magnitude of acting forces from each plate and b lock to China′s continent. According to the estimation, the impact force from I n dia plate to China′s continent is the maximum, and then is the underthrusting f orce from Philippine Sea plate to China′s continent.