High Quality Content by WIKIPEDIA articles! The October 2010 Sumatra earthquake was a magnitude 7.7 Mwearthquake that occurred on 25 October 2010 off the western coast of Sumatra, Indonesia at 21:42 local time (14:42 UTC). The earthquake occurred on the same fault that produced the 2004 Indian Ocean earthquake. It was widely felt across the provinces of Bengkulu and West Sumatra and resulted in a substantial localized tsunami that struck the Mentawai Islands.