Tsunami

Science / Weather / Tsunami: An ocean wave with a long period that is formed by an underwater earthquake or landslide, or volcanic eruption. It may travel unnoticed across the ocean for thousands of miles from its point of origin and builds up to great heights over shallower water. Also known as a seismic sea wave, and incorrectly, as a tidal wave.

Long Period Waves

Science / Tides and Currents / Long Period Waves: Forced or free waves whose lengths are much longer than the water depth. See tidal wave and tsunami. MORE

National Water Level Observation Network (NWLON)

Science / Tides and Currents / National Water Level Observation Network (NWLON): The network of tide and water level stations operated by the National Ocean Service along the marine and Great Lakes coasts and islands of the United States. The NWLON is composed of the primary and s MORE

Tidal Wave

Science / Geology / Tidal Wave: A term that is incorrectly used in reference to a tsunami. Tsunamis have nothing to do with the tides. MORE

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