The artificial ceiling is not made of concrete like typical ceilings. They are built on ceiling panels that are screwed and rodded to the main ceiling. When the ground begins to tremble during an earthquake, they may become unstable and potentially collapse. The risk of injury from a falling ceiling panel is usually limited to cuts from broken glass if someone is walking under the panel at the time it collapses. People have been hit by falling ceiling tiles before without any serious injuries occurring. If you are sitting at your desk working when the floor gives way beneath you, try to get up slowly and avoid injuring yourself. Do not walk under a collapsing ceiling! The first thing to go will be the light fixture, then the roof beam. If you are under the falling debris at the time it collapses, you could be injured or even killed. Stay away from areas where there is damage, water leaks, or other signs of instability. If you experience any problems with your plumbing, call a plumber immediately before attempting any repair work. Have your chimney swept annually for clogs. Use a brush to clear out any blocking material. Clogged chimneys can cause smoke stains on basement walls and ceilings as well as dangerous conditions in bedroom suites without adequate ventilation. Make sure your furnace is in good condition.