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NNR-MORVEL56板块运动模型描述了全球56个构造板块在无整体旋转参考架下的角速度运动参数。这些板块可以近似描述为单位球上的无重叠球面多边形区域。用ITRF速度场计算这56个板块相对于无整体旋转参考架下的绝对运动时,板块的几何参数起着至关重要的作用。详细给出了计算板块几何参数的方法并且编写了FORTRAN90程序以供参考,使得计算单位球上板块的面积和转动惯性张量得以实现。文中的计算方法和程序主要采用球面三角算法和自适应辛普森双积分算法,并对全球56个板块的几何参数进行了计算,得到了较为可靠的计算结果。
The NNR-MORVEL56 plate motion model describes the angular velocity motion parameters of 56 structural blocks worldwide without a monolithic rotating reference frame. These plates can be approximated as a non-overlapping spherical polygon area on a unit ball. The geometric parameters of the plate play a crucial role in calculating the absolute motion of these 56 plates relative to the non-integral rotating reference frame using the ITRF velocity field. The method of calculating geometric parameters of plates is given in detail and the FORTRAN90 program is compiled for reference so that the area and the moment of inertia of the plates in the calculation unit sphere can be realized. The computational methods and procedures in this paper mainly use the spherical trigonometry algorithm and the adaptive Simpson double integration algorithm, and calculate the geometric parameters of 56 plates in the world, and obtain more reliable calculation results.