If you are in a gymnasium, auditorium, or theater (most likely full of people), follow the instructions of those in authority and don't run in panic. Large open-span areas such as these are subject to collapse, so it is best to seek shelter in a hallway or small room. This is also true of large stores like Wal-Mart or supermarkets. In those situations, if there is no time to seek better shelter, go to the very back of the store--away from any large areas of glass--crouch down, and cover your head.