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Bachelor volcano

stratovolcano 2763 m / 9,065 ft
Oregon, USA (mainland exept Alaska), 43.98°N / -121.69°W
Current status: normal or dormant (1 out of 5) | Reports
Bachelor volcano books
Typical eruption style: Explosive
Bachelor volcano eruptions: 5800 BC ± 1000 (tephrochronology)
TimeMag. / DepthDistanceLocation
Thu, 13 Dec
Thu, 13 Dec 10:17 UTCM 0.9 / 1.1 km1 km- 22km ESE of Three Rivers, Oregon
Tue, 30 Oct
Tue, 30 Oct 01:02 UTCM 1.7 / 1.4 km26 km- 13km NNW of Bend, Oregon
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.

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.


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