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（华盛顿12日综合电）地磁北极的位置近年加速偏离，由北极群岛向俄罗斯西伯利亚方向移动。美国科学家以往每5年修正一次的“全球地磁模型”，现需提早一年至今年修正，以确保导航系统正常运作。

美国国家环境资讯中心发声明指，基于北极地区不按常规的变动，故提前至上周一（4日）更新全球地磁模型。据悉，地核的液态铁流动可改变地球的磁场线，造成所谓的磁极位移，令实际的地磁北极与地球转轴不对齐，且不断转变。

人类于1831年首次在加拿大北极群岛量度地磁北极，如今已向西伯利亚移动了2300公里。然而近年有加速趋势，地磁北极自2000年起的移动速度，由每小时15公里增至55公里，加速原因未明。地磁南极的移动速度则比北极慢得多。

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