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Jefferson: eruption history
Elevation3,199 m
TypeStratovolcano
Confirmed eruptions2#73 of 165 in country
Latest eruption950
Largest VEI–
Location44.67, -121.80
Eruptions (latest first, up to 60)
| Start | VEI | End | Area |
|---|---|---|---|
| 950 | – | – | S of Jefferson (South Cinder Peak) |
| 4500 BCE | – | – | SSE of Jefferson (Forked Butte) |
Nearby volcanoes
| Volcano | Distance | Eruptions |
|---|---|---|
| Blue Lake Crater | 29 km | 1 |
| Sand Mountain Field | 34 km | 2 |
| Belknap | 43 km | 4 |
| Three Sisters | 60 km | 6 |
| Bachelor | 78 km | 1 |
| Hood | 78 km | 5 |
| Newberry | 115 km | 11 |
| Davis Lake | 123 km | 1 |
Eruption records from the Smithsonian Global Volcanism Program; older eruptions may be missing. VEI = Volcanic Explosivity Index (0–8). For current alerts, check the official agency.