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The study about inetegrated motion of the earth based on the IGS fiduical stations

YANG Qiang①, DANG Ya-min②, LI Jian-cheng①(①School of Geodesy and Geomatics, Wuhan University, Wuhan 430079,China; ②Institute of Geodesy and Geodynamic, Chinese Academy of Surveying and Mapping,Beijing 100039,China)  
The paper has studied the integrated motion of the Earth by analysis IGS fiduical stations datum collected for many years. Firstly, the elevation linear velocity of many stations was calculated by linear fitting. Then, the rates of change of the closed circuits in different latitude were computed. The results indicated that the motion trends of stations were neither proportion nor symmetry. The values of the southern hemisphere are all positive, which indicate a trend that the southern hemisphere is integrated expanding. While the values of the northern hemisphere are both positive and negative, it shows there is not a sharp trend that the northern hemisphere is integrated motive. It concludes that the earth crust has an asymmetry motion trend.
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