Tsunami

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Tsunami
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The word tsunami comes from the Japanese word
meaning "harbor wave." Tsunamis are sometimes
incorrectly called "tidal waves" -- tsunamis are
not caused by the tides (tides are caused by the
gravitational force of the moon on the sea).
Regular waves are caused by the wind.
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• A tsunami (pronounced sue-nahm-ee) is a series of
  huge waves that can cause great devastation and
  loss of life when they strike a coast.

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• Tsunamis are caused by an underwater earthquake,
  a volcanic eruption, or a sub-marine rockslide.
• Most tsunamis are caused by underwater
  earthquakes, but the earthquake has to be over
  about magnitude 6.75 on the Richter scale for it
  to cause a tsunami

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A tsunami is caused when a huge volume of water
is quickly shifted. This rapid movement can
happen as the result of an underwater earthquake
(when the sea floor quickly moves up or down), a
rock slide, a volcanic eruption, or another
high-energy event.
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• After the huge volume of water has moved, the
  resulting wave is very long (the distance from
  crest to crest can be hundred of miles long) but
  not very tall (roughly 3 feet tall). The wave
  propagates (spreads) across the sea in all
  directions it can travel great distances from
  the source at tremendous speeds.

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• Tsunamis have an extremely long wavelength
  (wavelength is the distance between the crest
  (top) of one wave and the crest of the next wave)
  -- up to several hundred miles long. The period
  (the time between two successive waves) is also
  very long -- about an hour in deep water.

• In the deep sea, a tsunami's height can be only
  about 1 m (3 feet) tall. Tsunamis are often
  barely visible when they are in the deep sea.
  This makes tsunami detection in the deep sea very
  difficult.

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• A tsunami can travel at well over 600 mph in the
  open ocean - as fast as a jet flies. It can take
  only a few hours for a tsunami to travel across
  an entire ocean. A regular wave (generated by the
  wind) travels at up to about 90 km/hr.

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• The 2004 Indian Ocean earthquake, known by the
  scientific community as the Sumatra-Andaman
  earthquake, was an undersea earthquake that
  occurred at 005853 UTC (075853 local time) on
  December 26, 2004

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• Various values were given for the magnitude of
  the earthquake, ranging from 9.0 to 9.3 (which
  would make it the second largest earthquake ever
  recorded on a seismograph), though authoritative
  estimates now put the magnitude at 9.15.
• In May 2005, scientists reported that the
  earthquake itself lasted close to ten minutes
  when most major earthquakes last no more than a
  few seconds it caused the entire planet to
  vibrate at least a few centimetres.

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Note All figures are approximate and subject to
change. The first column links to more details on
specific countries.1 Includes those reported
under 'Confirmed'. If no separate estimates are
available, the number in this column is the same
as reported under 'Confirmed'.2 Does not include
approximately 19,000 missing people initially
declared by Tamil Tiger authorities from regions
under their control 55.3 Data includes at
least 2,464 foreigners.4 Does not include South
African citizens who died outside of South Africa
(eg, tourists in Thailand). For more information
on those deaths, see this link
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The End
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• ABC News Online - Asian Tsunami Disaster
  Australia
• ABC News - Tsunami Wave of Destruction USA
• Earthquake latest relief effort news Australia
• ASEAN Tsunami Update ASEAN
• BBC News - In-Depth Report Tsunami Disaster UK
• CBC News - In-depth Disaster in Asia Canada
• Channel News Asia - Special Coverage Killer
  Waves Singapore
• CNN - Special Tsunami Disaster USA
• Guardian Unlimited - Special Report Indian Ocean
  Tsunami Disaster UK
• Daily News Colombo - The Power of Humanity Sri
  Lanka
• Tsunami Sri Lanka Information Sri Lanka
• ICSF - Updated news about tsunami impacts on
  fisherfolk India
• Indonesia-Relief.Org News and database on
  Indonesia tsunami relief effort Indonesia
• New York Times USA

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• Tsunami pictures, gallery of photos, satellites
  images .
• Latest photos from Nias Off the coast of Northern
  Sumatra Aftershocks continue...
• Satellite photos with DHTML image comparison.
• Yahoo! Slideshows Asian Tsunami Disaster
• Photos during and after the destruction of Koh
  Phi Phi Island
• Satellite images of tsunami-affected areas
  (National University of Singapore) Microwave
  Image
• Pictures of the Tsunami
• Phuket Island, Thailand
• Interactive Mapping of Affected Regions
• Images  Visit to Kota Kuala Muda, Kedah,
  Malaysia Relief work in the northern state
• Tsunami photos at Flickr
• Images/video  Maldives Tsunami photo
  www.tsunamimaldives.mv
• Tsunamis.com - 2004 Asian Tsunami Pictures
• Photo and News archive of Dec 26 and March 28
  Earthquakes (Registered user)
• Humanity Ashore - from Sri Lanka
• Asian tsunami photo/news archive updated 24/7
• Information and photos on banda aceh tsunami
• photos from Kamala Beach (hotel)