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What you should know about tsunamis.
(From Philippine Daily Inquirer)
THE FOLLOWING information is excerpted from "Tsunami: The Great Waves" by the US National Oceanic & Atmospheric Administration, Unesco/Intergovernmental Oceanographic Commission, International Tsunami Information Center, Laboratoire De Geophysique, France, and from the US National Weather Service.
What is a tsunami?
The word tsunami (soo-NAH-mee) comes from the Japanese words tsu (which means harbor) and nami (which means wave). Tsunami is a series of traveling ocean waves of extremely long length generated primarily by earthquakes occurring below or near the ocean floor.
To use the term "seismic or tidal sea wave" to describe the phenomenon is misleading because tsunami waves can be generated by other nonseismic disturbances such as volcanic eruptions or underwater landslides, and have physical characteristics different from tidal waves.
Tsunami waves are completely unrelated to astronomical tides, which are caused by the extraterrestrial, gravitational influences of the moon, sun and the planets.
Sometimes, coastal waters are drawn out into the ocean just before the tsunami strikes. When this occurs, more shoreline may be exposed than even at the lowest tide. This major withdrawal of the sea should be taken as a warning of the tsunami waves that will follow.
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