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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
This eyewitness assessment of damage from the earthquake and tsunami yields lessons for engineers. On December 26, 2004, at 07:58:50 local time, a powerful earthquake, moment magnitude (MW) 9.2, occurred in the Indian Ocean.The Sumatra-Andaman earthquake was one of the three largest earthquakes ever recorded.eismological aspects of the December 2004 great Sumatra-Andaman earthquake, 2004 great Sumatra earthquakes and Indian Ocean tsunamis of December 26, 2004, and March 28, 2005. Earthquake Spectra 22 (S3): S1âS12.