|Elevation||140 m (460 ft)|
|Prominence||140 m (460 ft)|
|Location||Papua New Guinea|
|Last eruption||May 2007|
There are several recorded eruptions of this basaltic-andesitic stratovolcano prior to a spectacular lateral collapse which took place in 1888. Before that event, it was a circular conical island about 780 metres high. At about 5:30 am local time on 31 March 1888 a large portion of the island, containing perhaps 5 km3 of material slid into the sea during a relatively minor, possibly VEI 2, phreatic eruption. Eyewitnesses at Finschhafen, 100 km to the South, heard explosions and observed an almost imperceptible ash fall. Tsunamis 12–15 metres high were generated by the collapse and devastated nearby islands and the adjacent New Guinea coast killing around 3000 people.
The collapse left a 140 metre high 1900 metre long crescent-shaped island with a steep west-facing enscarpment. At least two small eruptions have occurred offshore since 1888, one in 1972 and another in 1974, which have resulted in the construction of a small submarine edifice within the collapse scar.
- "Ritter Island". Global Volcanism Program. Smithsonian Institution. Retrieved 2009-04-28.
- "Ritter Island - Eruptive History". Global Volcanism Program. Smithsonian Institution. Retrieved 2009-04-28.
- Ward, S.N. and Day, S. (2003). "Ritter Island Volcano—lateral collapse and the tsunami of 1888" (PDF). Geophysical Journal International 154 (3): 891–902. Bibcode:2003GeoJI.154..891W. doi:10.1046/j.1365-246X.2003.02016.x. Retrieved 2007-06-11.
- Ritter Island at Volcano World
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