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In page Lake Toba:

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Lake Toba lies near the Great Sumatran fault, which runs along the centre of Sumatra in the Sumatra fracture zone.[2] The volcanoes of Sumatra and Java are part of the Sunda Arc, a result of the northeasterly movement of the Indo-Australian plate, which is sliding under the eastward-moving Eurasian plate. The subduction zone in this area is very active: the seabed near the west coast of Sumatra has had several major earthquakes since 1995, including the 9.1 2004 Indian Ocean earthquake and the 8.7 2005 Nias–Simeulue earthquake, the epicenters of which were around 300 km (190 mi) from Toba.[citation needed]