<< >M-hm. I won't ask what weird force brings this about.
>Instead I'll observe that if it happens as often as danny implies,
>there shouldn't be a Hawaiian chain, because the crust would slip
>away from the hot-spot before the volcanic cone is more than an
>unremarkable lump on the seafloor.
>Alternatively, if the great shimmy happens every N million years,
>there should be several chains like Hawaii, scattered about the globe,
>appropriately staggered in age.
>>
Maybe the whole world turns, and not just the crust.