Global seismographic network records the Great Sumatra-Andaman earthquake



On 26 December 2004 the Indonesian subduction zone near the northern end of Sumatra began to rupture at 58 minutes, 47 seconds past midnight Greenwich Mean Time. The rupture continued for approximately seven minutes, extending northwestward along the Sunda Trench for roughly 1200 km to the Andaman Islands. The seafloor displacement generated a massive tsunami that swept ashore with 10-m amplitude in northern Sumatra and expanded across the Indian Ocean and Andaman Sea, striking Sri Lanka and Thailand within two hours of the rupture. Confirmed deaths along the coastlines of 11 Indian Ocean nations exceed 220,000, marking this as one of the most lethal natural disasters in human history