This convergence is responsible for the intense seismicity and volcanism in Sumatra. The Sumatra-Andaman portion of the collision zone forms a subduction zone megathrust plate boundary, the Sunda-Java trench, which accommodates convergence between the Indo-Australia and Sunda plates. The plate boundary southwest of Sumatra is part of a long tectonic collision zone that extends over 8000 km from Papua in the east to the Himalayan front in the west. In 2004, a 9.1-magnitude quake struck the coast of Sumatra and triggered a tsunami that killed 220,000 people throughout the region, including about 170,000 in Indonesia.Tectonic Summary Seismotectonics of the Sumatra Region That February quake had a depth of 12 kilometres, heaving damage upon homes and buildings, including mosques, schools and banks, and pushing authorities to evacuate more than 6,000 people. The month before, a 6.2-magnitude quake hit Sumatra's northern region, killing at least eight people and injuring dozens. It was followed by a series of strong aftershocks. Residents of North Sumatra's Nias and Hibala islands reported being shaken awake by the tremors. The last major quake that hit the country was in March, when a 6.7-magnitude quake hit off Sumatra island's west coast. Indonesia sits on the Pacific "Ring of Fire", causing it to experience frequent earthquakes. It classified it as a 6.5-magnitude quake, and said its epicentre was in the sea about 64 kilometres from shore. No tsunami threat was issued.īut the Indonesian Meteorology and Geophysics Agency (BKMG) advised residents to "watch out for possible aftershocks". However no casualties or damages were immediately reported by authorities, and USGS estimated that there would be little chance of damage on the ground in Sumatra island. It sent people in South Sumatra and Bengkulu rushing from their homes, according to local media and witnesses contacted by AFP. The shallow quake occurred in the waters off the southwestern coast of Sumatra island, at around 9.30pm nearest to Bengkulu, South Sumatra and Lampung provinces.
JAKARTA: A 6.0-magnitude earthquake hit off the coast of Indonesia late on Tuesday (Aug 23), according to the US Geological Survey, sending people fleeing their homes but with no casualties or damage immediately reported.
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