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An emergency population warning is a method whereby local, regional, or national authorities can contact members of the public en masse to warn them of an impending emergency. These warnings may be necessary for a number of reasons, including: * weather emergencies such as tornadoes, hurricanes, and ice storms; * geological disasters such as earthquakes, landslides, volcanic eruptions, and tsunamis; * industrial disasters such as the release of toxic gas or contamination of river water; * radiological disasters such as a nuclear plant disaster; * medical emergencies such as an outbreak of a fast-moving infectious disease; and * warfare or acts of terrorism. Many local areas use emergency population warnings to advise of prison escapes, abducted children, emergency telephone number outages, and other events. ==Requirements== In order to develop an effective emergency warning system, certain things are required: * an agreement as to what constitutes an emergency in the area served by the system. This differs from region to region depending on the local climate, geology, and the like. * an agreement as to who can initiate an alert. In some countries all warnings are transmitted by a single command center, while in others (such as the United States) a host of local, regional, and national agencies are authorized to initiate warnings. * a system or systems by which the information can be quickly transmitted to the population. * an education program to teach the general public how to recognize an alert or what to do if a warning is broadcast. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Emergency population warning」の詳細全文を読む スポンサード リンク
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