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.

Additional Metadata
Keywords Lithosphere
Persistent URL
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