Fake news?
SHTF are a bunch of loony toons.
There have been a bunch of polar reversals in geologic history, noted from the orientation of magnetite crystals in the basalts of the floor of the Atlantic Ocean, and in other ocean basins around the world.
Whether the next event happens tomorrow or a few hundred thousand years from now is anyone's guess, but the purveyors of panic manage to keep people fretting about things they can do nothing about, which keeps the herd from focusing on the things they can change.