冰后回弹对全球及中国参考框架的影响分析

Analysis on influence to the world's and China's Framework caused by postglacial rebound

文章利用ICE-5G模型发布的最新预报值,计算分析了冰后回弹对全球和中国区域的影响,发现冰后回弹不仅会引起垂直方向的地壳运动,而且还会引起水平方向的地壳运动,但是水平方向的量级要明显小于垂直方向.全球范围内最大回弹区域位于加拿大,大约为16mm/a,而由冰后回弹所引起的地壳水平方向运动达3mm/a.这个回弹量级对于维持毫米级ITRF的稳定所造成的影响是不容忽视的.中国范围内回弹值大概在0～0.7mm/a,这个量级对于参考框架的影响基本可以忽略.

This article used the latest forecast ICE-5G model to give a calculation and analysis on the change of the world and China caused by postglacial rebound. It found that the postglacial rebound can induce crustal motion not only in the vertical direction, but also in the horizontal direction. But the magnitude of the horizontal direction is significantly less than that of the vertical direction. The most remarkable rebound areas of the worldwide locates, which rebound value is approximately 16mm/a, and the horizon- tal crustal motion caused by postglacial rebound is about 3mm/a. This rebound level for maintaining the stability of millimeter level ITRF cannot be ignored. The postglacial rebound value within China is between 0--0.7mm/a, thus the effects of this rebound level to the reference frame can be ignored.