I remember a book I read very many years ago called "The HAB Theory". I don't remember the author's name. Fiction, long winded and not enough action for the teenager I was.. ;)
However, its main plot was that the earth's poles would periodically become so heavy with ice that the planetary wobble increased in a rapid fashion resulting in the poles swapping out with the equator. Don't know enough to say that makes any sense in this thread, but it sure would explain tsunamis, massive bone piles, frozen mammoth with buttercups in their mouths and a 4000-mile walkabout in the direction of the magnetic pole. ;)
"bIlujlaHbe'chugh bIQaplaHbe'" (If you cannot fail, you cannot succeed.)