基于ITRF2005的全球板块运动模型  

Global plate motion models based on ITRF2005

作　　者：朱新慧[1] 孙付平[1] 王刃[2] 

机构地区：[1]解放军信息工程大学测绘学院,郑州450052 [2]西安测绘研究所,西安710054

出　　处：《地球物理学进展》2009年第3期859-865,共7页Progress in Geophysics

基　　金：国家自然科学基金项目(40674014);测绘学院院课题(Y0706)资助.

摘　　要：利用最新的国际地球自转服务(IERS)发表的国际地球参考框架ITRF2005的速度场,建立了一个完全基于现代空间大地测量实测结果的现今全球板块运动模型ITRF2005VEL,并与地质模型NNR-NUVEL1A及以往利用ITRF序列所建立的模型进行了比较.结果表明,从整体上看ITRF2005 VEL与NNR-NUVEL1A模型有较好的一致性,且较以往的ITRF序列的模型精度更高,但同时也存在着一定的差异性,这与观测台站、板块本身等相关因素都有关.本文还由ITRF2005VEL模型计算了构造板块的总角动量,结果不为零,说明ITRF2005框架有可能不满足无整体旋转的要求。A new present-day global plate motion model ITRF2005VEL is determinated based on the ITRF2005 velocity field that is up-to-date released from the International Earth Rotation Service （IERS）, and is compared with the geological model of NNR-NUVEL1A and the old plate motion models founded on the series of ITRF. The result shows that there is a better consistency of ITRF2005VEL and NNR-NUVEL1A model in whole, and its precision is higher than that of the model of fore-ITRF. While, at the same time, there inevitably exist some differences between ITRF2005VEL and NNR-NUVEL1A which are related to the factors of lacking of observation stations, uneven station distributions, short observation times, not enough constraints to plates, and some problems of themselves and so on. So, current actual observation model ITRF2005VEL couldn＇t represent the movement characteristics of global plate motion nowadays. Therefore, the construction of more precise global plate motion model relies on the improvement of observation precision through space techniques, the increasing of observation time in stations, more even and dense station distribution, and more precise plate partition etc. Finally, we discussed that the total angular momentum of the tectonic plates according to the model of ITRF2005VEL is not equal to zero, which shows the ITRF2005 may be not sufficient accordant with the definition of CTRF and demonstrates that it may not meet the requirements of No-Net-Rotation, or that there are some differences among the selection of observation stations. Actually, even for the ITRF working group, there have not any common opinions. The inconsistency will influence the long-term maintenance and highly accurate application of ITRF2005 as well as long-term variation of the Earth rotation parameters. Therefore, in order to further solve this problem, numerous investigations and researches remain to be done in the future.

关 键 词：ITRF2005 欧拉矢量 板块运动 角动量 

分 类 号：P223[天文地球—大地测量学与测量工程]