1861 Sumatra earthquake
| Local date | 16 February 1861 |
|---|---|
| Magnitude | 8.5 Mw |
| Epicenter | 1°00′N 97°30′E / 1.0°N 97.5°E |
| Fault | Sunda megathrust |
| Areas affected | Sumatra, Dutch East Indies |
| Max. intensity | VIII (Heavily damaging) |
| Tsunami | Yes |
| Casualties | Several thousand |
The 1861 Sumatra earthquake occurred on 16 February and was the last in a sequences of earthquakes that ruptured adjacent parts of the Sumatran segment of the Sunda megathrust. It caused a devastating tsunami which led to several thousand fatalities. The earthquake was felt as far away as the Malay peninsula and the eastern part of Java. The rupture area for the 2005 Nias–Simeulue earthquake is similar to that estimated for the 1861 event.