GRACE数据反演中国西部地壳垂直运动速率  

Velocity of crustal vertical movement computed by using GRACE data in China's western region

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,西安710054 [2]陕西铁路工程职业技术学院,渭南714000 [3]长安大学地质工程与测绘学院,西安710054

出　　处：《地球物理学进展》2011年第4期1201-1205,共5页Progress in Geophysics

基　　金：国家自然科学基金(40674001);中央高校基本科研业务费专项资金(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,建立了地壳垂直运动与地球外部重力场变化的数学模型.根据此模型,将中国西部地区(经度80°～97.5°,纬度27.5°～47.5°)按2.5°×2.5°划分成(8行7列)共56个直立长方体,以2008年1月和2009年1月的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(Particle Swarm Optimization Algorithm)反演中国西部地区地壳垂直运动速率.反演结果表明中国西部地壳垂直运动具有整体不均匀的特点,总的趋势是南升北降.在南部喜马拉雅山脉地壳上升幅度最大,速率达10 mm/a;在北部准噶尔盆地的南部地壳垂直运动速率-3～-5 mm/a,向北沉降速率有加大趋势,最大速率为-9 mm/a.The model between the gravity changes in the external Earth and the crust vertical movement is established in a fixed coordinates system . According to this model, the velocity of crustal vertical movement in China＇s western region were computed with January 2008 and January 2009 GRACE Data, based on PSO（Particle Swarm Optimization Algorithm）. China＇s western region was divided into （eight row and seven column） fifty-six Erect cuboids with the 2.5°×2. 5° resolution. Results show that the vertical of crust movement characteristics is non-uniform in China＇s western region. On the whole, the trend is rising in the south and subsiding in the north. The crust of Himalayas is rising, the biggest rate can reach 10 mm/a. In the southern Junggar Basin, the vertical crustal movement rate was between -3-- -5 mm/a. The sedimentation rate northward trended to increase with the maximum rate of -9 mm/a.

关 键 词：GRACE 地壳垂直运动速率 直立长方体 中国西部地区 PSO 

分 类 号：P312[天文地球—固体地球物理学]