Inertia Tensor for MORVEL Tectonic Plates

分类： 天文学 >> 天文学 提交时间： 2017-10-20 合作期刊: 《天文研究与技术》

Li Chunxiao

摘要： The NNR(No一Net-Rotation)一MORVEL(Mid-Ocean Ridge VELocity)56 is a set of angular velocities describing the motions of 56 plates relative to a No-Net-Rotation reference frame. These plates can he adjusted in terms of non-overlapping polygonal regions，separated by plate boundaries on a unit sphere. During the calculation on the kinematic parameters for these 56 plates in a NNR reference frame using the International Terrestrial Reference Frame(ITRF) velocity field，the geometric parameters of tectonic plates play a significant role in establishing an absolute plate motion model based on space geodesy results. The computational method for these geometric parameters implemented as a FORTRAN90 program is described in this paper，allowing an evaluation of the area and the inertia tensor of a polygonal region on a unit sphere. This program is mainly built on a triangulation algorithm and the adaptive Simpson’s double integral method for spherical polygons，which produces highly reliable results for all 56 modern plates.

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