Service Tree

The Service Tree lists all services in "branched" groups, starting with the very general and moving to the very specific. Click on the name of any group name to see the sub-groups available within it. Click on a service code to see its details and the providers who offer that service.

Tsunami Advisories

Taxonomy Code: TH-2100.8500

Programs that activate warning systems (sirens or other mechanisms) and/or issue bulletins to warn the public of ocean-based earthquakes, volcanic eruptions or other events which are likely to produce tsunamis. Tsunami watches indicate that a tsunami is possible but not confirmed. Tsunami warnings confirm the approach of a tsunami and may include safety instructions for people who are in immediate peril. A tsunami is a series of ocean waves generated by the sudden displacement of large volumes of water by thrust-type submarine earthquakes, submarine volcanic eruptions, meteor impact, or coastal landslides. Tsunami wave activity is virtually imperceptible in the open ocean but tremendously destructive when it reaches shore, potentially stripping beaches of sand, undermining trees and other coastal vegetation and moving inland hundreds of feet, crushing boats, homes and other coastal structures in its wake. At some locations, the advancing turbulent front may be the most destructive part of the wave; at others the greatest damage may be caused by the outflow of water back to sea.

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