![]() It was strongly felt along the west coast of Thailand and Malaysia, and in Kuala Lumpur high-rise buildings were evacuated. The earthquake was strongly felt across the island of Sumatra and caused widespread power outages in the Indonesian city of Banda Aceh, already devastated by the December 2004 tsunami, and prompted thousands to flee their homes and seek higher ground. Nearly half of Gunungsitoli's population (27,000) fled. The death toll on Nias was at least one thousand, with 220 dying in Gunungsitoli, the island's largest town. On the Indonesian island of Nias, off the coast of Sumatra, hundreds of buildings were destroyed. Despite the proximity of the epicenter to that for the 2004 Indian Ocean earthquake, it ruptured a separate segment of the Sunda megathrust and was most likely triggered by stress changes associated with that earlier event. In the twenty-four hours immediately after the event, there were eight major aftershocks, measuring between 5.5 and 6.0. The earthquake lasted for about two minutes. Sunda Trench rupture zones for the 1833, 1861, and 2004 events Seismic recordings give the earthquake a moment magnitude of about 8.6, and effects were felt as far away as Bangkok, Thailand, over 1,000 kilometres (620 mi) away. The area is 200 kilometres (120 mi) west of Sibolga, Sumatra, or 1,400 kilometres (870 mi) northwest of Jakarta, approximately halfway between the islands of Nias and Simeulue. ![]() The hypocenter was located 30 kilometres (19 mi) below the surface of the Indian Ocean, where subduction is forcing the Indo-Australian Plate to the southwest under the Eurasian Plate's Sunda edge. It was the third most powerful earthquake since 1965 in Indonesia. The event caused panic in the region, which had already been devastated by the massive tsunami triggered by the 2004 Indian Ocean earthquake, but this earthquake generated a relatively small tsunami that caused limited damage. At least 915 people were killed, mostly on the island of Nias. ![]() The 2005 Nias–Simeulue earthquake occurred on 28 March off the west coast of northern Sumatra, Indonesia. ![]()
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