Bachelor Volcano
Updated: Mar 19, 2025 18:59 GMT -
stratovolcano
Oregon (Canada and USA (mainland)), 43.98°N / -121.69°W 
Summit height: 2763 m / 9,065 ft
Current status: normal or dormant (1 out of 5)
Mount Bachelor (formerly known as Bachelor Butte) in central Oregaon is a symmetrical stratovolcano, which is part of a 25 km long volcanic chain SE of South Sister.
The chain is aligned N-S and consists of the main volcano of Mt Bachelor itself, cinder cones, small shield volcanoes, and lava flows. The youngest eruption (dated by comparison with known dates of overlying and underlying layers) occurred about 6000 years ago at the Egan scoria cone on the north flank. It produced a lava flow that overlies (=is younger than) ash from the 6850 year BP eruption of Crater Lake.
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Bachelor volcano eruptions: 5800 BC ± 1000 (tephrochronology)
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
Background
The young basaltic-andesite and basaltic Mount Bachelor volcanic chain was formed in 4 eruptive phases dating back to only about 18,000-15,000 years ago.The NNW-SSE chain of cinder cones south of Mount Bachelor had been built by about 12,000 years before present. Mount Bachelor itself is one of the youngest edificies on the chain.
Significant volcanic eruptions: Bachelor volcano
No historic eruptions are known from Bachelor volcano, but at least one eruption around 5800 BC can be inferred from geological evidence.
The table below lists all known eruptions (date in bold face) of Bachelor volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Bachelor can be found on the news page of Bachelor volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
| North flank (Egan cone) | ? | ||||
Remark:
Our list of volcanic eruptions closely follows the database of eruptions of the Smithsonian's Global Volcanism Project (GVP), the internationally most recognized data source for volcanic eruptions, but also includes significant eruptive episodes or related volcano events. "Volcanic eruptions" are usually to be understood as sequences of individual eruptive episodes that can follow each other, or even overlap (if several vents are involved), and can last many years, decades or even longer. For example, the current activity of Stromboli volcano is understood as a single eruption that has been ongoing since 1934.
Sources: NOAA National Centers for Environmental Information (NCEI), Global Significant Volcanic Eruptions Database. doi:10.7289/V5TD9V7K | Global Volcanism Project / Smithsonian Institution
Bachelor Volcano FAQ
+When was the last eruption of Bachelor volcano?
The last confirmed eruption of Bachelor occurred around 5800 BC.
Latest satellite images
Bachelor Volcano Maps
Below is a selection of maps showing the location and surroundings of the volcano at various resolutions based on aerial-imagery / terrain maps. Feel free to use them for non-commercial purposes on your blog or website as long as you credit them with a link back to this page (click to copy it).
Satellite/aerial-type map of Bachelor volcano (world scale)
Terrain-type map of Bachelor volcano (world scale)
Satellite/aerial-type map of Bachelor volcano (region scale large)
Terrain-type map of Bachelor volcano (region scale large)
Satellite/aerial-type map of Bachelor volcano (region scale medium)
Terrain-type map of Bachelor volcano (region scale medium)
Satellite/aerial-type map of Bachelor volcano (region scale small)
Terrain-type map of Bachelor volcano (region scale small)
Satellite/aerial-type map of Bachelor volcano (local scale large)
Terrain-type map of Bachelor volcano (local scale large)
Satellite/aerial-type map of Bachelor volcano (local scale medium)
Terrain-type map of Bachelor volcano (local scale medium)
Satellite/aerial-type map of Bachelor volcano (local scale small)
Terrain-type map of Bachelor volcano (local scale small)
Satellite/aerial-type map of Bachelor volcano (scale of 10s of km)
Terrain-type map of Bachelor volcano (scale of 10s of km)
Satellite/aerial-type map of Bachelor volcano (scale of 20-40 km)
Terrain-type map of Bachelor volcano (scale of 20-40 km)
Satellite/aerial-type map of Bachelor volcano (scale of approx. 10-20 km)
Terrain-type map of Bachelor volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Bachelor volcano (scale of 5-10 km)
Satellite/aerial-type map of Bachelor volcano (scale of few kilometers)
