text:  Typically, if that happens, minutes later, a tsunami is going to strike. Another warning sign is the earth shaking. If you're in the coastal zone and you feel an earthquake, you don't know whether it's happened inland or offshore. So your immediate response should be go inland or go high. And the third is that in documented cases of when tsunamis have hit, there's been a freight train sound or a loud bang coming from offshore. So that's another sign that there might be a tsunami ready to strike.