| Tsunamis | WHAT IS A TSUNAMI? | | A tsunami (pronounced soo-nah-mee) is a wave or chain of waves generated when a large body of water is abruptly displaced. The word "tsunami" is derived from the two Japanese words 'tsu' meaning "harbor" and 'nami' meaning "wave." Underwater earthquakes, volcanoes, landslides, man-made explosions, or even meteors have the ability to cause these massive displacements of water. Tsunamis are not the same as tidal or wind-generated waves normally seen at the beach. Whereas a wind-generated wave may have a wavelength (point between both crests of two waves) of 300 feet for a period of 10 seconds, a tsunami can have a wavelength of over sixty miles lasting for a period of over an hour. This large moving volume of water lasting for long periods of time is what causes so much catastrophic damage | | HOW A TSUNAMI IS FORMED | | Most tsunamis are formed by earthquakes greater than 7 on the Richer scale that has a focus less than 18 miles deep in the earth. These submarine earthquakes occur frequently in the Pacific Ocean where continental tectonic plates move up and over each other. This movement causes the ocean water above the surface of the seafloor to displace pushing it upward. Below is a diagram of tsunami formed from a tectonic plate generated earthquake. | | IMPORTANT THINGS YOU SHOULD KNOW ABOUT TSUNAMIS | | -
Beaches, lagoons, bays, estuaries, tidal flats, and river mouths are the most dangerous places to be | |
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