关于全球板块运动模型ITRF2000VEL若干问题探讨

利用最新的国际地球自转服务（IERS）发布的国际地球参考架ITRF2000速度场，建立了一个独立于任何其它模型、安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ITRF2000VEL，较百万年平均地质模型NNR－NUVELIA更能真正反映全球板块现今运动特征，相比ITRF96,晚接近于百万年地质模型NNR－NUVELIA，而且ITRF2000参考架在定向、原点和尺度的定义较ITRF96和ITRF97参考架有了改进，但ITRF200VEL模型存在诸多问题：总角动量|L|=0.127，即不为零，与协议参考架（CTRF）不符，存在整体旋转，并建立无旋转NNR－ITRF2000VEL模型，台站不均匀分布全球板块、部分板块界线不明确以及有的板块不满足刚性特征等，这些对ITRF2000的高精度应用和长期维持、地球自转参数的长期变化都将产生一定的影响。

Discussing the Newest Present-day Global Plate Motion Model ITRF2000

A newest present-day plate motion ITRF2000VEL that is free of any additional tectonic plate model assumption is obtained basing on the ITRF2000 velocity field that is published by International Earth Rotation Service (IERS). Comparison with plate motion model ITRF96, ITRF2000 and NNR-NUVEL1A respectively shows that ITRF2000 model is more close to NNR-NUVEL1A model, which shows that global plate motion is steady in several million years; Moreover, the scale, origin and orientation of ITRF2000 were ameliorated comparing to ITRF96 and ITRf97. But there exist many questions of ITRF2000; we analyze the influenceable factors and established No Net Rotation model of NNR-ITRF2000.