Tsunami Warning 6
Tsunami Warning 6 : The highest level of tsunami alert. Warnings are issued by the TWCs due to confirmation of a destructive tsunami wave or the threat of an imminent tsunami. Initially the warnings are based only on seismic information without tsunami confirmation as a means of providing the earliest possible alert to at-risk populations. Warnings initially place a restricted area in a condition that requires all coastal areas in the region to be prepared for imminent flooding. Subsequent text products are issued at least hourly or as conditions warrant to continue, expand, restrict, or end the warning. In the event a tsunami has been confirmed which could cause damage at distances greater than 1,000 km from the epicentre, the warning may be extended to a larger area. Centre that issues timely tsunami information messages. The messages can be information, watch, or warning messages, and are based on the available seismological and sea level data as evaluated by the TWC, or on evaluations received by the TWC from other monitoring agencies. The messages are advisory to the official designated emergency response agencies. Regional TWCs monitor and provide tsunami information to Member States on potential ocean-wide tsunamis using global data networks, and can often issue messages within 10-20 minutes of the earthquake. Local TWCs monitor and provide tsunami information on potential local tsunamis that will strike within minutes. Local TWCs must have access to continuous, real-time, densely-spaced data
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