What are Tsunami Bulletins, Watches, and Warnings?
Tsunami Information Bulletin : Message issued by the West Coast Alaska Tsunami Warning Center (WCATWC) to advise public safety agencies of the occurrence of a major earthquake in the Pacific or near-Pacific area, with the evaluation that a potentially destructive Pacific-wide tsunami was not generated. Tsunami Warning Bulletin : Warning message issued throughout the Pacific based on confirmation that a tsunami has been generated that poses a threat to the population in part or all of the Pacific coast regions. A Tsunami Warning will be followed by additional bulletins with updated information until it is cancelled. Regional Tsunami Warning/Watch Bulletin: Message issued initially by West Coast Alaska Tsunami Warning Center (WCATWC) based only on seismic information to alert all participants of the possibility of a tsunami and advise them that a tsunami investigation is underway. Those areas that are within 0 to 3 hours from the estimated time of arrival of the first wave are placed in
