Good news for Americans traveling abroad: you no longer have anything to fear from suspicious, secretly vicious locals. Now you just have to watch out for cataclysmic natural disasters and falling debris, which conveniently bring out the bloodthirsty maniac and paranoid xenophobe in everybody. Basically, if traveling to another country seemed dangerous before, it’s even moreso now, but that’s only because Aftershock has no idea what kind of movie it wants to be, or even how to be it. Is it about Americans being menaced in a foreign land, or is it about how much mankind lives at the whim of shifting tectonic plates? Either way, it’s not particularly good, so it…