Tsunami Watch Bulletin
Tsunami Watch Bulletin : A message issued initially using only seismic information to alert all participants of the probability of a tsunami and advise that a tsunami investigation is underway. The area placed in Tsunami Watch status will encompass a 6-hour tsunami travel-time from the earthquake epicenter. Those areas within a 3-hour tsunami travel-time of the epicenter will be designated for possible urgent action. A Tsunami Watch will be followed by additional bulletins until it is either upgraded to a Tsunami Warning or the Tsunami Watch is cancelled
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