THE BACKGROUND FIELD OF GLOBAL CRUSTAL MOTIONS AND ITS STUDYING PROGRESS
Received date: 2001-11-30
Revised date: 2002-05-20
Online published: 2002-10-01
The global crust is moving in the background field of global crustal motions, whose Euler parameter is a basic character of plate motion. A significant portion of the Earth's surface consists of zones of diffuse deformation, whose interior regions move at distinctly different velocities from that of adjacent plates, and, because of their complexities, have been ignored in previous models, such as ITRF 96VEL，ITRF 97VEL and ITRF 2000VEL We have calculated a new NNR model that incorporates both rigid plate and plate boundary zones with ITRF 2000 velocity field and local GPS field. The total angular momentum of the 22 tectonic plates is 0.131o/Ma, which shows the ITRF 2000 is not sufficient accordant with the definition of CTRF. The inconsistency will influence the long-term maintenance and highly accurate application of ITRF 2000 and long-term variation of the Earth Rotation Parameters, so we infer an accurate No-Net-Rotation model that differences from previous NNR models and consists the diffuse boundary zone, such as the central and southeast Asia, the extending belts of north America plate. At last we remark on the progress of the plate motion model.
Key words： ITRF; NNR(No-Net-Rotation); Global plate motion model.
JIN Shuang-gen，ZHU Wen-yao . THE BACKGROUND FIELD OF GLOBAL CRUSTAL MOTIONS AND ITS STUDYING PROGRESS [J]. Advances in Earth Science, 2002 , 17(5) : 782 -786 . DOI: 10.11867/j.issn.1001-8166.2002.05.0782
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