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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
1 A magnitude 6.1 earthquake struck the Pacific-Antarctic Ridge on January 15 at a depth of 10 km (6.2 mi).  A magnitude 6.1 earthquake struck northern Sumatra, on January 21 at depth of 12 km (7.5 mi), killing one person and injuring 15 others.