Tsunami! What happened & why??? A PROJECT SUBMITED BY- NANDEESH LAXETTI X ‘C’
2004 Indian Ocean Earthquake NOAA
Magnitude 9.0 ( Moment magnitude scale )
http://en.wikipedia.org/wiki/2004_Indian_Ocean_earthquake Epicenter 150 KM west of Sumatra
Occurred along the subduction zone where the Indian dives under the Eurasian Plate http://www.nps.gov/prsf/geology/images/plates.gif
The earthquake came just three days after a magnitude 8.1 earthquake in an uninhabited region west of New Zealand
Possible connection between these two earthquakes
Possibility of a seismic chain reaction across neighboring plates has also been considered
Total energy released by a magnitude 9.0 earthquake exceeds the total amount of energy consumed in the U.S. in one month
Massive release of energy and shift in mass insignificantly altered the Earth's rotation
A tsunami (pronounced soo-NAA-mee) is a series of waves (called a "wave train") generated in a body of water by a pulsating or abrupt disturbance that vertically displaces the water column.
Tsunami's are also mistakenly referred to as tidal waves as they often resemble a tide that keeps rising, rather than cresting waves when they reach shore. However, as they are not actually related to tides the term may be misleading, and its use is discouraged by scientists.
Anthony Liekens 15:30, 28 Dec 2004 (UTC)
Tsunamis are created when:
Seafloor quickly changes shape
Water is displaced
Waves are formed as the displaced water mass, which is affected gravity, tries to move back
Move at high speeds
Can travel enormous distances with little energy loss
Can cause damage thousands of miles from its origin
May be several hours between its creation and its impact on the coast
Warning Systems Many countries around the Pacific, including Hawaii, have warning systems and evacuation procedures in the event of a serious tsunami.