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.