It is important because it can save human lives for example by telling them an earthquake is headed to their country so they will be prepared or they can move to a different country. The communication devices for this EMERGENCY is cell phone, phone, black berry.
During the Katrina 
hurricane Katrina used satellite communications.
During an EMERGENCY it is essential to tell which disaster is headed for the country and if you know any advice to help survive the earthquake then tell the people.
Information needed to know before the disaster is what is the disaster. What can we do to protect ourselves and when is it coming and going.
They are many ways you can communicate on the computer. Some of them are msn messenger, yahoo messenger, sykpe, and other chat boxes.
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