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On December 26, 2004, an earthquake registering 9.3 on the Richter scale ripped open the ocean floor in the Sunda Trench 160 kilometers (100 miles) off the western coast of Sumatra, Indonesia. The earthquake was the second largest ever recorded on a seismograph, with the largest occurring in Valdivia, Chile, in 1960. The magnitude of the earthquake was 9.0, resulting in the fourth-largest-magnitude earthquake in the world since 1900, and the largest since the Alaskan earthquake in 1964. The earthquake resulted from a shift in the India plate under the Burma plate, which the U.S. Geological Survey estimates created a rupture on the sea floor almost 62 miles in width and up to 700–900 miles in length. The sea floor overlying the thrust fault is estimated to have been uplifted by 10 to 15 feet. This rupture caused the earth to shake nearly half an inch, creating additional earthquakes simultaneously across South Asia and as far away as the United States. This earthquake, referred to by the scientific community as the Great Sumatra-Andaman earthquake, spawned one of the most destructive and powerful tsunamis in recorded history, most commonly known as the Indian Ocean tsunami, the Boxing Day tsunami (Canada), or the Asian tsunami.

The Indian Ocean tsunami is considered the largest and most destructive tsunami in recorded history, resulting in an estimated 225,000 causalities, the loss of some 1 million jobs, destruction of more than 2,000 schools, and the displacement of over 1.6 million people in at least 12 countries. In fact, the adverse impacts occurred as far as 3,000 miles away from the epicenter of the earthquake, in Africa. Taken together, these impacts show that the Indian Ocean tsunami can be considered a catastrophic event. In contrast to a disaster, a catastrophe is characterized by the prolonged inoperability of an impacted community, disruption of normal routines due to the large-scale impacts of the occasion, nearby communities having difficulty offering help because of the widespread impact, officials having difficulty undertaking routine work roles, and government and political groups playing an increasingly significant role in dealing with the event.

Impacted Nations

At least 14 countries around the Indian Ocean were directly affected by the Indian Ocean tsunami (from highest to least number of causalities): Indonesia, Sri Lanka, India, Thailand, Somalia, Maldives, Malaysia, Myanmar, Tanzania, Seychelles, Bangladesh, Yemen, South Africa, and Kenya. The estimated economic and infrastructural losses were $9.9 billion across the impacted region. However, in terms of loss of life, people missing, and infrastructure destruction, four South Asian nations (Indonesia, Sri Lanka, India, and Thailand) were the hardest hit. As the country located closest to the epicenter of the earthquake, Indonesia suffered more fatalities (more than 129,000) and had more displaced (over 566,000) and missing (94,000) than any other impacted country in South Asia. In fact, over half of the deaths and destruction occurred in Indonesia.

Social, cultural, and economic impacts in Indonesia included the necessary relocation of entire fishing communities and economic devastation, with a loss of 40 percent of private sector housing and unemployment of over 30 percent in the disaster area, a rate comparable to that of the Great Depression in the United States. To compound this catastrophic event, Indonesia suffered another earthquake on March 28, 2005, in Nias, resulting in nearly 900 deaths and additional structural damage. Sri Lanka suffered the second highest population loss (more than 38,000), an immense amount of damage to infrastructure, and almost 1 million people displaced. In addition, reconstruction efforts are estimated to cost nearly $2 billion over three to five years. India suffered the third highest population loss (over 16,296) and an immense amount of damage (an estimated $1.2 million), much of it in remote areas, threatening its ability to recover internally in coastal provinces. Thailand was the most popular tourist destination in South Asia in 2001, with more than 10 million visitors annually. However, its economic stability was threatened due to the devastation and damage caused by the Indian Ocean tsunami. Thailand was the fourth most heavily affected nation in terms of mortality (4,600) and the second most economically affected. Thailand had the highest number of foreign tourist casualties, with more than 3,330, generating substantial media attention of dead or trapped international tourists.

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