If you haven't already read the story of the Pole shift (magnetic) on the CIA site, you should. Besides a nuclear holocaust, these DUMBs and Denver area (Pikes peak etc) are your best options for surviving such an event…if possible even.
Might be what they are hiding in the long game.
Imagine the magnetic poles suddenly reverse, the earths crust slips from the molten core and spins at 1000s of MPH 90 or more degrees from center. Suddenly the artic regions are at the current equator and the tropics are in darkness.
The oceans spill across the landscape devouring everything it their path (think Dinosaurs, fossils, Mammoths found flash frozen with undigested food in their stomachs).
Any known earthquake would feel like a tickle. Then the ice melts over long periods creating new lakes, rivers, canyons.
Look at the Grand canyon, Columbia river, Arches NP, canyonlands etc…these were not formed like we were taught in school. They happened suddenly (relatively).
I can think of one Place I'd feel fairly safe
SWITZERLAND
and
Colorado Mountains/Cheyenne mtn
Maybe Inner Mongolia.