2011 Japan Earthquake - Tsunami Fast Facts
The Centre is operated by the Bureau of Meteorology and Geoscience Australia, and was established to provide Australia with an independent capability to detect, monitor, verify and warn the community of tsunami threats. National No Threat Bulletin : To advise people that the earthquake has been assessed and that no tsunami threat exists.
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J Tsunami Warnings. The Victoria State Emergency Service VICSES is the control agency for tsunami in Victoria, which means that we are responsible for planning for tsunami and for managing response if a tsunami does occur. A tsunami is a series of waves generated by any of the following: Vertical movement of the sea floor after a large earthquake Submarine or coastal eruptions Meteor impacts Submarine or coastal landslides.
And their long wavelengths mean they lose very little energy along the way. More than 1, people died in Rikuzentakata, one of several towns eradicated by a tsunami that hit Japan. In deep ocean, tsunami waves may appear only a foot or so high.
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But as they approach shoreline and enter shallower water they slow down and begin to grow in energy and height. The tops of the waves move faster than their bottoms do, which causes them to rise precipitously.
When it does, it produces a vacuum effect that sucks coastal water seaward and exposes harbor and sea floors. Recognizing this phenomenon can save lives. A tsunami is usually composed of a series of waves, called a wave train, so its destructive force may be compounded as successive waves reach shore.
People experiencing a tsunami should remember that the danger may not have passed with the first wave and should await official word that it is safe to return to vulnerable locations.
Some tsunamis do not appear on shore as massive breaking waves but instead resemble a quickly surging tide that inundates coastal areas. The best defense against any tsunami is early warning that allows people to seek higher ground. The Pacific Tsunami Warning System, a coalition of 26 nations headquartered in Hawaii, maintains a web of seismic equipment and water level gauges to identify tsunamis at sea.