Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Jefferson
Volcanic activity at glacially eroded Mount Jefferson, Oregon's second highest peak, ended during the Pleistocene. However, cinder cones south of the volcano have been active as recently as about a thousand years ago. The extensive Whitewater Glacier in the foreground has eroded deeply into the volcano and blankets the east flank of Jefferson. Photo by Willie Scott, 1981 (U.S. Geological Survey).
Volcano Number:322020
Volcano Name:Jefferson
Country:United States
Volcano Type:Stratovolcano
Last Eruption:950
Elevation:3199m
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:0
Pop. within 10km:0
Pop. within 30km:823
Pop. within 100km:556054
Latitude:44.674
Longitude:-121.8



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
322020 Jefferson 20577 Confirmed Eruption SSE of Jefferson (Forked Butte) Varve Count -4500
322020 Jefferson 20578 Confirmed Eruption S of Jefferson (South Cinder Peak) Varve Count 950
Emissions Data from the Global Volcanism Program of the Smithsonian Institution No emissions data found for this volcano.


Data from the Earthchem Portal
Sorry. No data exist for this volcano in the EarthChem Portal.


Data from the SESAR Database


Data from the MaGa Database
Sorry. No data exist for this volcano in the MaGa database.