In his books The Earth's Shifting Crust (1958) (which includes a foreword by Albert Einstein) and Path of the Pole (1970), Hapgood speculated that accumulated polar ice mass destabilizes the Earth's rotation, causing crustal displacement but not disturbing the Earth's axial orientation. Hapgood argued that shifts (of no more than 40 degrees ...
https://en.wikipedia.org/wiki/Cataclysmic_pole_shift_hypothesis