Earth has active plate tectonics, volcanism, hurricanes/tornadoes (with enough mass in them to destroy things), land slides, floods, lightning, and maybe worst

Earth has active plate tectonics, volcanism, hurricanes/tornadoes (with enough mass in them to destroy things), land slides, floods, lightning, and maybe worst of all other humans. If we're living in a closed-ish habitat anyways, I think Mars might even manage to be easier (provided there was a critical mass of humans living on it). It seems like the only unpredictable natural disasters there are dust storms. Especially if you consider that any post apocalyptic habitat scenario is going to leave a lot of people out, and they aren't going to be peaceful about that during the transition.