[Centurion2000]

The theory states that at times Earth's surface mass becomes imbalanced. The continents become dramatically offset from the planet's spin axis and so move rapidly to right themselves

Excuse me while I call out for some skepticism. Crust 50miles thick. Mantle 2000+ miles thick. A defect on the skin of an onion is not going to destabilize the entire thing when it spins.

[spunkets]

"Crust 50miles thick."

The crust isn't 50 mi thick. It varies. Here's a contour map of hte thickness. 1km=0.62mi.

"This contour map of the thickness of the Earth's crust was developed from the CRUST 5.1 model. The contour interval is 10 km; we also include the 45 km contour for greater detail on the continents."

[yefragetuwrabrumuy]

I can imagine a “jumpstart” being given to existing plate motion, say by the Chicxulub impact, a six mile diameter rock, producing a 100 teraton blast, leaving a crater over a hundred miles across.