World Map › Three Sisters
Volcano
Three Sisters
Volcanic complex · 3,159 m · United States of America
Three Sisters sits on the North American Plate, in a subduction zone. 6 eruptions are known since the end of the last ice age, the most recent in 439.
- Elevation
- 3,159 m
- Type
- Volcanic complex
- Tectonic Setting
- Subduction zone, continental crust
- Dominant Rock
- Andesite / Basaltic Andesite
- Plate
- North American Plate
- Country
- United States of America
- Last Eruption
- 439
- Known Eruptions (Holocene)
- 6
- Max. Explosivity (VEI)
- 4
Nearby Cities
Cities of more than 20,000 people within 100 km.
- 37 kmBend75,000 people
- 97 kmSpringfield56,000 people
Eruption Timeline
Each bar is an eruption; its height shows its explosivity (VEI 0 to 8).
Eruption Uncertain Date
Sources : Global Volcanism Program, 2026. Volcanoes of the World (v. 5.4.0; 7 Aug 2026), Smithsonian Institution, doi:10.5479/si.GVP.VOTW5-2026.5.4 (volcano.si.edu) · NOAA NCEI · USGS · Wikidata