On 26th December,2004, at 00:58:53 UTC, an earthquake of magnitude 9 in the Richter scale equivalent to about 23,000 Hiroshima sized bombs)struck near the Sunda trench, 150 miles off the northern coast of Sumatra. In what is called a subduction zone the Indian ocean plate slid under the Burma plate by about 65 feet in four minutes. . Normally the movement is about 2.5 feet per year. The tear was about 90 miles wide and about 750 feet long running from the Sumatra to the Andaman and Nicobar islands, that is more than 50,000 square miles of sea bed shifted in four minutes. This created a 15 foot wave at the surface of the ocean. At the eastern edge the sea surface dropped 6 feet, mirroring the change in the sea bed. This is called an N wave, a crest and an trough.
The giant wave raced across the Indian ocean with the speed of an airliner and hit as far away as the east African coast 3000 miles away in 7 hours. The wave was about 15-30 feet near the epicentre and reached heights of about 56 feet at the coastline near Sumatra and Thailand.
Those 7 hours changed the very earth itself. More than 200,000 people are believed tohave perished, most of them instantly as the giant wall of wtaer roared almost 4 miles inland. The quake was so powerful it shook the axis of the earth and shortened the length of the day. Some islands southewest of Sumatra moved away by as much as 30 feet.
The 2004 Sumatra-Andaman earthquake was the fourth largest in since 1900. In terms of human lives lost the Bunda Aceh quake ranks as one of history’s worst natural diasasters.
In an earth becoming more and more violent, with gigantic quakes and hurricanes of unbelevable fury, the frial life forms, human and others, is sudenly projected as at once precious and precarious.