The earthquake happened along a line where the Earth's Indo-Australian and Eurasian tectonic plates grind together, in the waters west of Sumatra.
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Bantul is only 200km (125 miles) north of one of the world's most active fault lines, where the Indo-Australian and the Eurasian plates meet.
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Where the Pacific plate collides with the Indo-Australian plate, it is forced downwards into the trench, a subduction zone, and the volcanoes are carried with it.
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