Mount Bachelor | U.S. Geological Survey
Source: https://www.usgs.gov/volcanoes/mount-bachelor
Archived: 2026-04-23 17:10
Mount Bachelor | U.S. Geological Survey
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Mount Bachelor
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At 2,764 meters (9,068 feet) high, Mount Bachelor is the prominent peak just south of the Three Sisters in central Oregon.
Quick Facts
Location:
Oregon, Deschutes County
Latitude:
43.979° N
Longitude:
121.688° W
Elevation:
2,764 (m) 9,068 (f)
Volcano type:
Stratovolcano
Composition:
Basalt to Andesite
Most recent eruption:
About 9,500 years ago
Threat Potential:
Moderate*
*based on the
National Volcano Early Warning System
Summary
It is located within the Deschutes National Forest, 20 km west-southwest of Bend, Oregon. Mount Bachelor is the largest volcano in the 25-km-long, north-south trending, Mount Bachelor volcanic chain, which is composed of numerous cinder
cones, lava flows, and shield volcanoes and covers and area of nearly 250 km
2
(100 mi
2
). Eruptions of the chain began during or closely following the retreat of late Pleistocene glaciers (after about 18 ka) and ended before the eruption of Mount Mazama (Crater Lake at 7.7 ka), with the main pulse of activity lasting perhaps only 3,000 years. The volcanic chain produced mainly lava flows and near-vent tephra falls. The chain is typical of one style of mafic (basalt to andesite) volcanism found throughout the Cascades Volcanic Arc—effusive eruptions from aligned short-lived volcanic vents.
October 22, 2018
2018 update to the U.S. Geological Survey national volcanic threat assessment
2018 update to the U.S. Geological Survey national volcanic threat assessment
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners...
Authors
John W. Ewert, Angela K. Diefenbach, David W. Ramsey
By
Volcano Hazards Program
,
Volcano Science Center
,
Agrigan
,
Ahyi Seamount
,
Alamagan
,
Anatahan
,
Asuncion
,
Belknap
,
Black Butte Crater Lava Field
,
Black Rock Desert Volcanic Field
,
Blue Lake Crater
,
Carrizozo Lava Flow
,
Cascade Range Weekly Update
,
Cinnamon Butte
,
Clear Lake Volcanic Field
,
Coso Volcanic Field
,
Crater Lake
,
Craters of the Moon Volcanic Field
,
Daikoku Seamount
,
Davis Lake Volcanic Field
,
Devils Garden Lava Field
,
Diamond Craters Volcanic Field
,
Dotsero Volcanic Center
,
East Diamante
,
Esmeralda Bank
,
Farallon de Pajaros
,
Fukujin Seamount
,
Glacier Peak
,
Guguan
,
Haleakalā
,
Hell's Half Acre Lava Field
,
Hualālai
,
Indian Heaven Volcanic Field
,
Jordan Craters Volcanic Field
,
Kama‘ehuakanaloa
,
Kasuga 2
,
Kīlauea
,
Lassen Volcanic Center
,
Long Valley Caldera
,
Mammoth Mountain
,
Markagunt Plateau Volcanic Field
,
Maug Islands
,
Mauna Kea
,
Mauna Loa
,
Medicine Lake
,
Mono Lake Volcanic Field
,
Mono-Inyo Craters
,
Mount Adams
,
Mount Bachelor
,
Mount Baker
,
Mount Hood
,
Mount Jefferson
,
Mount Rainier
,
Mount Shasta
,
Mount St. Helens
,
Newberry
,
Ofu-Olosega
,
Pagan
,
Red Hill-Quemado Volcanic Field
,
Ruby
,
Salton Buttes
,
San Francisco Volcanic Field
,
Sand Mountain Volcanic Field
,
Sarigan
,
Soda Lakes
,
South Sarigan Seamount
,
Supply Reef
,
Ta'u Island
,
Three Sisters
,
Tutuila Island
,
Ubehebe Craters
,
Uinkaret Volcanic Field
,
Valles Caldera
,
Wapi Lava Field
,
Weekly Update
,
West Crater Volcanic Field
,
Yellowstone
,
Zealandia Bank
,
Zuni-Bandera Volcanic Field
January 1, 1994
Temporal, spatial and petrologic variations of lava flows from the Mount Bachelor volcanic chain, central Oregon High Cascades
Temporal, spatial and petrologic variations of lava flows from the Mount Bachelor volcanic chain, central Oregon High Cascades
No abstract available.
Authors
Cynthia A. Gardner
By
Mount Bachelor
January 1, 1989
Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades
Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades
No abstract available.
Authors
William E. Scott, Cynthia A. Gardner, Scott A. Lundstrom, Brittain E. Hill, Edward M. Taylor, Andrei M. Sarna-Wojcicki, Charles E. Meyer, John K. Nakata, J.L. Slate, P.C. Russell
By
Volcano Hazards Program
,
Volcano Science Center
,
Mount Bachelor
View All
October 24, 2023
Hazards Summary for Mount Bachelor
Although Mount Bachelor looks similar to many of the more long-lived and potentially dangerous volcanic peaks of the Cascade Range, the mountain is part of a mafic volcanic chain that poses little danger for future eruptive activity.
By
Cascades Volcano Observatory
,
Mount Bachelor
Hazards Summary for Mount Bachelor
October 24, 2023
Hazards Summary for Mount Bachelor
Although Mount Bachelor looks similar to many of the more long-lived and potentially dangerous volcanic peaks of the Cascade Range, the mountain is part of a mafic volcanic chain that poses little danger for future eruptive activity.
Learn More
October 15, 2023
Geology and History Summary for Mount Bachelor
Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
By
Cascades Volcano Observatory
,
Mount Bachelor
Geology and History Summary for Mount Bachelor
October 15, 2023
Geology and History Summary for Mount Bachelor
Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
Learn More
October 11, 2023
Eruption History of Mount Bachelor Volcanic Chain
Four discrete eruptive episodes are recognized.
By
Cascades Volcano Observatory
,
Mount Bachelor
Eruption History of Mount Bachelor Volcanic Chain
October 11, 2023
Eruption History of Mount Bachelor Volcanic Chain
Four discrete eruptive episodes are recognized.
Learn More
View All
Quick Facts
Location:
Oregon, Deschutes County
Latitude:
43.979° N
Longitude:
121.688° W
Elevation:
2,764 (m) 9,068 (f)
Volcano type:
Stratovolcano
Composition:
Basalt to Andesite
Most recent eruption:
About 9,500 years ago
Threat Potential:
Moderate*
*based on the
National Volcano Early Warning System
Volcanoes Hazards Program Links
Assess
Prepare
Forecast
Activity
Products
Observatories
About
Was this page helpful?
Skip to main content
Official websites use .gov
A
.gov
website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A
lock (
)
or
https://
means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Mount Bachelor
Find U.S. Volcano
Filters
Learn More
The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows.
Get Help
Earthquake Plots
To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over.
Map Layers
Earthquake Colors
Earthquake Depth Units
Earthquake Time Units
Results
Filters
Learn More
The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows.
Get Help
Earthquake Plots
To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over.
Settings
Map Layers
Earthquake Colors
Earthquake Depth Units
Earthquake Time Units
x
Map Legend
x
Map Legend
Results
Mount Bachelor
Home
Science
Maps
Multimedia
Publications
Additional Resources
Connect
At 2,764 meters (9,068 feet) high, Mount Bachelor is the prominent peak just south of the Three Sisters in central Oregon.
Quick Facts
Location:
Oregon, Deschutes County
Latitude:
43.979° N
Longitude:
121.688° W
Elevation:
2,764 (m) 9,068 (f)
Volcano type:
Stratovolcano
Composition:
Basalt to Andesite
Most recent eruption:
About 9,500 years ago
Threat Potential:
Moderate*
*based on the
National Volcano Early Warning System
Summary
It is located within the Deschutes National Forest, 20 km west-southwest of Bend, Oregon. Mount Bachelor is the largest volcano in the 25-km-long, north-south trending, Mount Bachelor volcanic chain, which is composed of numerous cinder
cones, lava flows, and shield volcanoes and covers and area of nearly 250 km
2
(100 mi
2
). Eruptions of the chain began during or closely following the retreat of late Pleistocene glaciers (after about 18 ka) and ended before the eruption of Mount Mazama (Crater Lake at 7.7 ka), with the main pulse of activity lasting perhaps only 3,000 years. The volcanic chain produced mainly lava flows and near-vent tephra falls. The chain is typical of one style of mafic (basalt to andesite) volcanism found throughout the Cascades Volcanic Arc—effusive eruptions from aligned short-lived volcanic vents.
October 22, 2018
2018 update to the U.S. Geological Survey national volcanic threat assessment
2018 update to the U.S. Geological Survey national volcanic threat assessment
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners...
Authors
John W. Ewert, Angela K. Diefenbach, David W. Ramsey
By
Volcano Hazards Program
,
Volcano Science Center
,
Agrigan
,
Ahyi Seamount
,
Alamagan
,
Anatahan
,
Asuncion
,
Belknap
,
Black Butte Crater Lava Field
,
Black Rock Desert Volcanic Field
,
Blue Lake Crater
,
Carrizozo Lava Flow
,
Cascade Range Weekly Update
,
Cinnamon Butte
,
Clear Lake Volcanic Field
,
Coso Volcanic Field
,
Crater Lake
,
Craters of the Moon Volcanic Field
,
Daikoku Seamount
,
Davis Lake Volcanic Field
,
Devils Garden Lava Field
,
Diamond Craters Volcanic Field
,
Dotsero Volcanic Center
,
East Diamante
,
Esmeralda Bank
,
Farallon de Pajaros
,
Fukujin Seamount
,
Glacier Peak
,
Guguan
,
Haleakalā
,
Hell's Half Acre Lava Field
,
Hualālai
,
Indian Heaven Volcanic Field
,
Jordan Craters Volcanic Field
,
Kama‘ehuakanaloa
,
Kasuga 2
,
Kīlauea
,
Lassen Volcanic Center
,
Long Valley Caldera
,
Mammoth Mountain
,
Markagunt Plateau Volcanic Field
,
Maug Islands
,
Mauna Kea
,
Mauna Loa
,
Medicine Lake
,
Mono Lake Volcanic Field
,
Mono-Inyo Craters
,
Mount Adams
,
Mount Bachelor
,
Mount Baker
,
Mount Hood
,
Mount Jefferson
,
Mount Rainier
,
Mount Shasta
,
Mount St. Helens
,
Newberry
,
Ofu-Olosega
,
Pagan
,
Red Hill-Quemado Volcanic Field
,
Ruby
,
Salton Buttes
,
San Francisco Volcanic Field
,
Sand Mountain Volcanic Field
,
Sarigan
,
Soda Lakes
,
South Sarigan Seamount
,
Supply Reef
,
Ta'u Island
,
Three Sisters
,
Tutuila Island
,
Ubehebe Craters
,
Uinkaret Volcanic Field
,
Valles Caldera
,
Wapi Lava Field
,
Weekly Update
,
West Crater Volcanic Field
,
Yellowstone
,
Zealandia Bank
,
Zuni-Bandera Volcanic Field
January 1, 1994
Temporal, spatial and petrologic variations of lava flows from the Mount Bachelor volcanic chain, central Oregon High Cascades
Temporal, spatial and petrologic variations of lava flows from the Mount Bachelor volcanic chain, central Oregon High Cascades
No abstract available.
Authors
Cynthia A. Gardner
By
Mount Bachelor
January 1, 1989
Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades
Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades
No abstract available.
Authors
William E. Scott, Cynthia A. Gardner, Scott A. Lundstrom, Brittain E. Hill, Edward M. Taylor, Andrei M. Sarna-Wojcicki, Charles E. Meyer, John K. Nakata, J.L. Slate, P.C. Russell
By
Volcano Hazards Program
,
Volcano Science Center
,
Mount Bachelor
View All
October 24, 2023
Hazards Summary for Mount Bachelor
Although Mount Bachelor looks similar to many of the more long-lived and potentially dangerous volcanic peaks of the Cascade Range, the mountain is part of a mafic volcanic chain that poses little danger for future eruptive activity.
By
Cascades Volcano Observatory
,
Mount Bachelor
Hazards Summary for Mount Bachelor
October 24, 2023
Hazards Summary for Mount Bachelor
Although Mount Bachelor looks similar to many of the more long-lived and potentially dangerous volcanic peaks of the Cascade Range, the mountain is part of a mafic volcanic chain that poses little danger for future eruptive activity.
Learn More
October 15, 2023
Geology and History Summary for Mount Bachelor
Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
By
Cascades Volcano Observatory
,
Mount Bachelor
Geology and History Summary for Mount Bachelor
October 15, 2023
Geology and History Summary for Mount Bachelor
Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
Learn More
October 11, 2023
Eruption History of Mount Bachelor Volcanic Chain
Four discrete eruptive episodes are recognized.
By
Cascades Volcano Observatory
,
Mount Bachelor
Eruption History of Mount Bachelor Volcanic Chain
October 11, 2023
Eruption History of Mount Bachelor Volcanic Chain
Four discrete eruptive episodes are recognized.
Learn More
View All
Quick Facts
Location:
Oregon, Deschutes County
Latitude:
43.979° N
Longitude:
121.688° W
Elevation:
2,764 (m) 9,068 (f)
Volcano type:
Stratovolcano
Composition:
Basalt to Andesite
Most recent eruption:
About 9,500 years ago
Threat Potential:
Moderate*
*based on the
National Volcano Early Warning System
Volcanoes Hazards Program Links
Assess
Prepare
Forecast
Activity
Products
Observatories
About
Was this page helpful?