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Global Volcanism Program | Image GVP-02999

Morning alpenglow colors the glaciers of Mount Jefferson, reflected in the waters of Breitenbush Lake north of the volcano.  The glacially eroded volcano has not erupted since the late Pleistocene, although flank vents to the south have been active as recently as about 1000 years ago. Photo by Lee Siebert, 1995 (Smithsonian Institution).

Morning alpenglow colors the glaciers of Mount Jefferson, reflected in the waters of Breitenbush Lake north of the volcano. The glacially eroded volcano has not erupted since the late Pleistocene, although flank vents to the south have been active as recently as about 1000 years ago.

Photo by Lee Siebert, 1995 (Smithsonian Institution).


Jefferson