Bachelor

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 43.979°N
  • 121.688°W

  • 2763 m
    9063 ft

  • 322090
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
5800 BCE ± 750 years Unknown Confirmed   Magnetism North flank (Egan cone)

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


Mount Bachelor, a symmetrical stratovolcano SW of Bend, Oregon, is seen here from the north with a neoglacial moraine in the center. No known summit eruptions have occurred during the Holocene, although Bachelor was active until the latest Pleistocene and a north flank vent produced a series of lava flows that immediately preceded the eruption of the Mazama ash about 6850 years ago.

Photo by Willie Scott, 1981 (U.S. Geological Survey).
See title for photo information.
Kwohl Butte cinder cone in the foreground is part of a 25-km-long chain of small shield volcanoes and cinder cones extending north to Mount Bachelor. South and Middle Sister volcanoes are visible to the left behind the furrowed slopes of Mount Bachelor.

Photo by Lee Siebert, 1981 (Smithsonian Institution).
See title for photo information.
Kwohl Butte cinder cone is one in a 25-km-long chain of cinder cones and small shield volcanoes south of Mount Bachelor in the central Cascade Range of Oregon. Despite the youthful appearance of the cone, geologic mapping indicates construction of the chain was completed about 12,000 years ago

Photo by Lee Siebert, 1981 (Smithsonian Institution).
See title for photo information.
Mount Bachelor, seen here from the jagged summit of Broken Top volcano to the north, is a symmetrical stratovolcano constructed during the latest Pleistocene. The only known Holocene eruptions were from a cone on the north flank. Mount Bachelor is a major downhill skiing destination of the central Oregon Cascades.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
See title for photo information.
Mount Bachelor, rising 1000 m above Sparks Lake on the west, is a late Pleistocene-to-Holocene basaltic-andesite stratovolcano at the northern end of a 25-km-long chain of scoria cones and small shield volcanoes. The 2763-m-high symmetrical volcano is the site of a major ski resort SW of Bend, Oregon.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


The following 3 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 112584-1 Basalt
NMNH 112584-2 Basalt
NMNH 112584-3 Pumice

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