Flying debris can be lethal. Most fatal or serious injuries are from head blows. Family members and other groups are often separated. Have a preassigned point of contact and establish procedure to follow. Local lines will be jammed.
Winds can be fierce.
Hold on to something attached to the floor system. Many victims are concealed by rubble. A police whistle warn around the neck might be used to attract rescue workers. Disaster preparation should include provision for psychological as well as physical effects. Severe emotional responses are inevitable after a disaster.