スマトラ島沖地震
West Sumatra is one of the earthquake-prone areas in Indonesia, due to its location in the tectonic slab located between the confluence of two major continental plates (the Eurasian plate and Indo-Australian plate) and Great Sumatran fault, plus the activity of the active volcanoes. Large earthquakes that occurred recently in West Sumatra earthquake were the 2009 Sumatra earthquake and the 2010 Mentawai earthquake and tsunami.