卫星重力测量数据反演中国西部地壳水平运动速率  

Crustal Horizontal Movement Velocity in West China Inversed by Satellite Gravity Data

作　　者：段虎荣[1,2,3] 张永志[3] 徐海军[3] 姚顽强[1] 

机构地区：[1]西安科技大学测绘科学与技术学院,陕西西安710054 [2]陕西铁路工程职业技术学院,陕西渭南714000 [3]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《地震研究》2011年第3期344-349,共6页Journal of Seismological Research

基　　金：国家自然科学基金(40674001);中央高校基本科研业务费专项定金(CHD2010ZY016);长安大学基础研究支持计划专项基金资助

摘　　要：在固定的坐标系下,讨论了直立长方体水平运动与其外部的重力场变化之间的关系,建立了地壳水平运动与地球外部重力场变化的数学模型。根据此模型,并参考直立长方体大小以及地形等因素,用2003～2008年GRACE(Gravity Recovery And Climate Experiment)卫星数据计算地球外部重力场变化,基于PSO算法(ParticleSwarm Optimization Algorithm)反演中国西部地区地壳水平运动速率。反演结果表明:中国西部地壳水平运动具有整体由南向北、且伴有向东运动的特征;地壳水平运动表现为不均匀,除昆明区域(地壳由北向南运动)外,在南北方向上地壳水平运动速率具有从南向北逐渐递减的趋势。青藏高原南北方向运动速率为10～35 mm/a,东西方向运动速率1～25 mm/a;塔里木盆地南北方向运动速率5～15 mm/a,东西方向运动速率4～7 mm/a。The relationship between the horizontal movements of the erect cube and its exterior gravitational field chan- ges in the fixed coordinates are discussed. The mathematical model between the horizontal movements of the crust and the changes of the Earth exterior gravitational field is established. According to this model, using Gravity Recovery and Climate Experiment （GRACE） satellite＇s data from 2003 to 2008, we calculate the gravitation- al field changes, and inverse the velocity of the horizontal crustal movement in West China through the Particle Swarm Optimization （PSO） algorithm. The results show that there exists an overall and horizontal movement of the crust in West China from South to North with the trend of eastward movement. The velocity declines gradually from South to Noah, except Kunming region （whose crust moves from North to South）. In the North-South direction and East-West direction, the velocities of horizontal crustal movement of the Qinghai-Tibet plateau are 10 -35mm/a and 1 -25mm/a respectively. In the North-South direction and East-West direction, the velocities of Tarim Basin are 5 - 15 mm/a and 4 - 7mm/a respectively.

关 键 词：卫星重力测量 地壳水平运动 直立长方体 西部地区 PSO算法 

分 类 号：P315.72[天文地球—地震学]