2009 Sumatra earthquakes
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| Date | September 30, 2009 |
|---|---|
| Origin time | 10:16:10 UTC |
| Magnitude | 7.6 Mw |
| Depth | 90 km (56 mi) |
| Epicenter | 0°43′N 99°58′E / 0.71°N 99.97°ECoordinates: 0°43′N 99°58′E / 0.71°N 99.97°E |
| Type | Reverse |
| Areas affected | Indonesia |
| Max. intensity | VII (Very strong) |
| Tsunami | 27 cm (11 in) |
| Landslides | Yes |
| Casualties | 1,115 dead 1,214 severely injured 1,688 slightly injured |
The September 2009 Sumatra earthquake (Indonesian: Gempa bumi Sumatra 2009) occurred on September 30 off the coast of Sumatra, Indonesia with a moment magnitude of 7.6 at 17:16:10 local time. The epicenter was 45 kilometres (28 mi) west-northwest of Padang, Sumatra, and 220 kilometres (140 mi) southwest of Pekanbaru, Sumatra. Government reports have to date confirmed 1,115 dead, 1,214 severely injured and 1,688 slightly injured. The most deaths occurred in the areas of Padang Pariaman (675), Padang (313), Agam (80) and Pariaman (37). In addition, around 135,000 houses were severely damaged, 65,000 houses were moderately damaged and 79,000 houses were slightly damaged. An estimated 250,000 families (1,250,000 people) have been affected by the earthquake through the total or partial loss of their homes and livelihoods.
The whole of Indonesia except Borneo, Bangka Belitung, Riau Islands and Timor is situated within a zone of high seismic activity known as the Pacific Ring of Fire. Along the Sunda megathrust, the Indo-Australian Plate is being subducted beneath the Eurasian plate. The subduction creates regular earthquakes, many of them of megathrust type. Specifically the Sumatran segment is currently experiencing a period of increased activity that began with the catastrophic 2004 Indian Ocean earthquake. Each earthquake of the sequence adds additional stresses to segments of the plate boundary that have not moved recently.
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