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Tsunami

The tsunami, as sparked by the powerful earthquake in Japan today is a big wave or series of waves generated in a water body by the violent thrust of a force that moves vertically.


This term is composed of Japanese-tsu "which means" port "and" nami "means" wave "- and was adopted at a conference in 1963.

The waves that form the "tsunami" hit the coast separated by about fifteen or twenty minutes.

After the first wave, the sea drops

The first is usually not the highest, but is very similar to normal, then there is a dramatic decline in sea level followed by the first giant wave, then for several more.

Formerly they were called "tidal waves", "tsunami" or "seismic sea waves," but these terms have increasingly become obsolete, not adequately describe the phenomenon. The first two involve tidal movements, a different phenomenon caused by the gravitational pull exerted by the planets, Sun and Moon.

Earthquakes are a major cause of "tsunami", but can also provoke volcanoes, meteorites, landslides, coastal and underground and even explosions of great magnitude.

For an earthquake originates a "tsunami" on the sea floor abruptly be moved vertically so that the ocean is driven out of their normal balance. When that vast body of water attempts to regain its equilibrium, waves are generated.

The size of the "tsunami" is determined by the magnitude of vertical deformation of seafloor. Scales and alerts


There
to describe the energy scales of "Tsunamis", although, unlike earthquakes, are primarily based on the demonstrations on the coast.

Although there are no mechanisms to predict earthquakes, it's there to alert the tsunami before his arrival on the coast, as its propagation speed is much lower than seismic waves.

The potential "tsunami" is working effectively and for years in Japan and the U.S.. The alarm system in the Pacific was established in 1946 after the tsunami that followed an earthquake in the Aleutian Islands caused 165 deaths in Hawaii and Alaska.

Although any ocean can experience a "tsunami" more often occur in the Pacific, whose margins are seat of considerable magnitude earthquakes (particularly the coasts of Chile, Peru and Japan). However, there were also significant tidal waves in the Atlantic and Indian Oceans and the Mediterranean Sea.

A large tsunami accompanied the earthquake of Lisbon in 1755, the Mona Passage to Puerto Rico in 1918 and Grand Banks of Canada in 1929.

The earthquake of Lisbon on November 1, 1755, had its epicenter in the sea, southwest of Cape San Vicente, and forty-foot waves swept the coast of Huelva and Cadiz English causing some 2,000 deaths.

The "tsunami" most devastating so far occurred on December 26, 2004, after an earthquake of 8.9 magnitude on the Richter scale with epicenter off Indonesia's Sumatra island, causing nearly 230,000 deaths, mostly in Indonesia, but also affected Sri Lanka, India, Thailand, Somalia and the Maldives and other countries. (With information from AFP)

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evolves Tsunami

The following pictures provided by the National Oceanic Atmospheric Administration and the United States showed a forecast of the evolution of the tsunami caused by the powerful quake and subsequent Japan tsunami suffered today.

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More than one country in the Pacific Ocean region, including 10 in Latin America, are under tsunami warning issued by NOAA.