摘要:
近20年来,国际地学界不同领域的学者应用多种先进的手段与方法,对现今地球各圈层的水平运动分别进行了长期观测与研究,揭示出地球不同圈层水平运动的基本规律,为全球构造运动与地球自转的相关性提供了新的重要证据。对地球不同圈层水平速度矢量场的对比分析发现,现今地球各个圈层均存在速率量级不同的总体西向运动的特征,不同圈层的水平运动速度矢量场具有高度的相似性,且与地球自转密切相关;在中低纬度地区,各圈层西向速度矢量居主导地位;在中高纬度地区形成一些东向回流;速率大小与纬度存在统计相关关系,纬度愈小,速率愈大;岩石圈稳态水平运动速率在纬度φ=0°与φ=35°呈极大值。
Abstract:
In the last 20 years, scientists in different fields have observed and studied the horizontal motion of the diffferent layers of the earth, including the hydrosphere, lithosphere, asthenosphere, lower mantle, core-mantle boundarylayer and outer core resorting to different means and methds.The velocity maps produced for the horizontal motion of each layer from the data accumulated show some new evidence for the correlation between the global tectonic movement and the earth's rotation.A comparison of the horizontal velocity fields of each layer indicates high similarities;there is a marked westward movement of each layer at middle-low latitudes and some eastward back flow at high latitudes.The horizontal velocity of each layer is statistically related to latitude(φ), the nearer to the equator, the greater the velocity.The steady horizontal velocity for the lithosphere reaches the maximum at φ=0° and φ=35°.These results suggest a close relation between the horizontal motion of the earth and its rotation.
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