Earthquake preparedness refers to a variety of measures designed to help individuals, businesses, and local and state governments in earthquake prone areas to prepare for significant earthquakes. Preparedness measures are part of the emergency management cycle.
In the United States, buildings codes in earthquake prone states currently often have specific requirements designed to increase new buildings' resistance to earthquakes. Older buildings and homes that are not up to code may be retrofitted to increase their resistance. Such retrofitting is often required for older commercial and governmental buildings under state laws. Retrofitting and earthquake resistant design are also employed in elevated freeways and bridges. Current buildings code is not designed to make buildings earthquake proof in the sense of them suffering zero damage. The goal of most building designs is to reduce earthquake damage to a building such that it protects the lives of occupants and thus tolerance of some limited damage is accepted and considered a necessary tradeoff Earthquake retrofitting techniques and modern building codes are designed to prevent total destruction of buildings for earthquakes of no greater then 8.5 on the Richter Scale [http://www.il-st-acad-sci.org/kingdom/geo1001.html.
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