Tsunami: Tsunami: The The Tragic DisasterTragic Disaster

Introduction:Introduction: This slideshow presentation will be about This slideshow presentation will be about

the horrific Indian Ocean Tsunami that the horrific Indian Ocean Tsunami that left a dark gloomy shadow over a number left a dark gloomy shadow over a number of innocent countries. This is a significant of innocent countries. This is a significant piece of history that affected the people of piece of history that affected the people of Tamil Nadu. This disaster left an Tamil Nadu. This disaster left an unforgettable memory to those who unforgettable memory to those who survived as victims and to those who survived as victims and to those who witnessed an unstoppable force happen witnessed an unstoppable force happen right in front of their eyes right in front of their eyes

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Earthquake Earthquake CharacteristicsCharacteristics

The earthquake was initially reported as 6.8 on the Richter scale. The The earthquake was initially reported as 6.8 on the Richter scale. The Pacific Tsunami Warning Center(PTWC) also estimated it at 8.5 shortly Pacific Tsunami Warning Center(PTWC) also estimated it at 8.5 shortly after the earthquake. On the moment magnitude scale, which is more after the earthquake. On the moment magnitude scale, which is more accurate for quakes of this size, the earthquake's magnitude was first accurate for quakes of this size, the earthquake's magnitude was first reported as 8.1 by the U.S. Geological Survey. After further analysis, reported as 8.1 by the U.S. Geological Survey. After further analysis, this was increased to 8.5, 8.9, and finally to 9.0.this was increased to 8.5, 8.9, and finally to 9.0.

The earthquake was unusually large in geographical extent. An The earthquake was unusually large in geographical extent. An estimated 1200 km (750 miles) of faultline slipped about 15 m (45 ft) estimated 1200 km (750 miles) of faultline slipped about 15 m (45 ft) along the subduction zone where the India Plate dives under the Burma along the subduction zone where the India Plate dives under the Burma Plate. The slip did not happen instantaneously but took place in two Plate. The slip did not happen instantaneously but took place in two phases over a period of several minutes.phases over a period of several minutes.

The India Plate is part of the great Indo-Australian Plate, which The India Plate is part of the great Indo-Australian Plate, which underlies the Indian Ocean and Bay of Bengal, and is drifting northeast underlies the Indian Ocean and Bay of Bengal, and is drifting northeast at an average of 6 cm/year (2 inches/year). The India Plate meets the at an average of 6 cm/year (2 inches/year). The India Plate meets the Burma Plate (which is considered a portion of the great Eurasian Plate) Burma Plate (which is considered a portion of the great Eurasian Plate) at the Sunda Trench. At this point the India Plate subducts the Burma at the Sunda Trench. At this point the India Plate subducts the Burma Plate which includes the Nicobar Islands, the Andaman Islands and Plate which includes the Nicobar Islands, the Andaman Islands and northern Sumatra. northern Sumatra.

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