These are the sounds of a tsunami warning. They alert residents that a killer wave is about to strike. These sirens, however, are just a small part of the sophisticated warning systems that played a role in Japan and in the U.S. during the Pacific Ocean tsunami in March 2011.

Check out our Every Full Moon collection on Tsunami Science and Safety:
https://oceantoday.noaa.gov/everyful...

Original video source:
https://oceantoday.noaa.gov/tsunamist...

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