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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: dormant (1 out of 5)
Bachelor volcano books
Typical eruption style: Explosive
Bachelor volcano eruptions: 5800 BC ± 1000 (tephrochronology)
TimeMag. / DepthDistanceLocation
Sun, 31 Dec
Sun, 31 Dec 20:55 UTCM 0.1 / 0.8 km2 km- 23km ESE of Three Rivers, Oregon
Thu, 14 Dec
Thu, 14 Dec 18:41 UTCM 1.4 / 2.7 km3 km- 23km ESE of Three Rivers, Oregon
Thu, 14 Dec 18:41 UTCM 2.1 / 1 km3 kmNEWBERRY CALDERA AREA, OREGON
Wed, 13 Dec
Wed, 13 Dec 17:12 UTCM 0.3 / 1.5 km7 km- 18km ESE of Three Rivers, Oregon
Tue, 12 Dec
Tue, 12 Dec 18:54 UTCM 0.6 / 1.7 km1 km- 22km ESE of Three Rivers, Oregon
View all recent quakes
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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