In the event of a potential tsunami, bulletins will be issued by the National Oceanographic and Atmospheric Administration (NOAA). Local authorities are given the responsibility of determining if and when to evacuate residents to safer ground. The following terms are used, in ascending order of severity, in relation to a potential tsunami :
Tsunami Advisory
An earthquake has occurred in the Pacific basin, which might generate a tsunami.
Tsunami Watch
A tsunami was or may have been generated, but is at least two hours travel time to the area in Watch status.
Tsunami Warning
A tsunami was, or may have been generated, which could cause damage;
therefore, people in the warned area are strongly advised to evacuate. source : http://www.fema.gov/hazard/tsunami/ts_terms.shtm
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