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As of September 1, 2014, the NOAAWatch website will be discontinued. Active weather alerts will continue to be available 24/7 at Hurricane tracking widgets will continue to be available at and Learn about ways to get updates through social media at For information about how to reach other NOAA data and information, please email A temporary redirect of website traffic to NOAA’s homepage will exist for a short period of time after the shut-down of

UPDATE:  The NWS has replicated the NOAAWatch Briefing Page which can be found at

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A tsunami (pronounced “soo-nah-mee”) is a series of ocean waves caused by any large, abrupt disturbance of the sea-surface. Earthquakes cause most tsunamis, but a tsunami can also be generated by landslides, volcanic activity, or rarely by meteor impact. If the disturbance is close to the coastline, a local tsunami can cause death and destruction among coastal communities within minutes. A very large disturbance, such as the magnitude 9.0 earthquake off the Sumatra coast in 2004, can generate waves that cause local devastation and destruction thousands of miles away. To learn more about tsunamis, read NOAA’s Tsunami Story.
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A NOAA DART II tsunami buoy Learn more...

In the deep ocean, the tsunami wave may only be a few centimeters high. However, tsunami waves, because of their long wavelengths, lose little energy as they travel. This means that while the tsunami wave may come gently ashore, depending on the energy, landforms, direction of travel, tides and other factors the wave may come ashore as a deadly, fast moving wall of turbulent water several meters high. In deep water, the waves may reach speeds exceeding 700 kilometers per hour.

While the frequency of damaging tsunamis in the United States coastal areas is low compared to many other natural hazards, the impacts can be extremely high. Tsunamis cannot be prevented but the impact of a tsunami can be mitigated through community preparedness, timely warnings, and effective response. Developing tsunami-resilient communities depends on enhanced Federal, State and local capabilities in each of the following seven areas:

  • Determining the Threat

  • Preparedness

  • Timely and Effective Warnings

  • Mitigation

  • Public Outreach and Communication

  • Research

  • International Coordination

NOAA has primary responsibility for providing tsunami warnings to the Nation, and a leadership role in tsunami observations and research. For more information about tsunamis and building tsunami resilient communities, visit NOAA’s Tsunami Website.

Tsunami Messages Issued by NOAA's Tsunami Warning Centers:

Tsunami Information from the National Tsunami Warning Center

Tsunami Information Hawaii Tsunami Messages

Tsunami Information Statement Caribbean Tsunami Messages

Tsunami Information Bulletin Pacific Tsumani Messages

Indian Ocean Tsunami Watch Cancellation Indian Ocean Tsunami Messages

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