Westward drift of the lithosphere: Not a result of rotational drag
It is shown that any non-zero torque resulting from differences in angular velocity between individual shells in the Earth would be an extremely short transient phenomenon as a consequence of the viscosity of the asthenosphere. Consequently, it cannot be a factor in the origin of the toroidal velocity field of degree one ('westward drift') of the lithosphere.
|Journal||Geophysical Journal International|
Ranalli, G. (2000). Westward drift of the lithosphere: Not a result of rotational drag. Geophysical Journal International, 141(2), 535–537. doi:10.1046/j.1365-246X.2000.00091.x