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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
The catastrophe began when the earthquake, the world's biggest in 40 years, struck just before 7 a.m. Sunday beneath the Indian Ocean, 155 miles southeast of Banda Aceh on the Indonesian island of Sumatra. The quake spawned tsunami waves, some traveling at 500 mph and rising 30 feet into the air.