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These regional recordings shown strong spatial variations in amplitude and duration that are consistent with rupture directivity effects. The duration of ground motion of the December event to the north in Thailand was about 600 seconds, while the duration in other directions, including Sumatra, was about 1,000 seconds. Earthquake Rupture Models
Find out how to take action here. 1  The December 26, 2004 Indian Ocean tsunami was caused by an earthquake that is thought to have had the energy of 23,000 Hiroshima-type atomic bombs. 2  The epicenter of the 9.0 magnitude quake was located in the Indian Ocean near the west coast of Sumatra.