Eruption of Three Sisters
350 BCE · 44.13° N, 121.77° W
The Three Sisters are a trio of closely spaced volcanic peaks in the U.S. state of Oregon. Named North, Middle, and South, they are part of the Cascade Volcanic Arc, a segment of the Cascade Range in western North America extending from southern British Columbia through Washington and Oregon to Northern California.
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What the records say
- When
- 350 BCE
- Kind
- Volcanic eruption
- Coordinates
- 44.13° N, 121.77° W
- Vei
- 4
- Date uncertainty
- year uncertain
- Vent
- SW flank of South Sister (Rock Mesa)
- Dated by
- Isotopic: 14C (uncalibrated)
- Volcano number
- 322070
- Eruption number
- 20593
Three Sisters (Oregon)
Three volcanic peaks in Oregon, U.S.
The Three Sisters are a trio of closely spaced volcanic peaks in the U.S. state of Oregon. Named North, Middle, and South, they are part of the Cascade Volcanic Arc, a segment of the Cascade Range in western North America extending from southern British Columbia through Washington and Oregon to Northern California. Each over 10,000 feet in elevation, they are the third-, fourth- and fifth-highest peaks in Oregon.
From Wikipedia, CC BY-SA · Read the article
The source
- Smithsonian GVP Volcanoes of the World: Holocene eruptionsGlobal Volcanism Program, Smithsonian InstitutionSmithsonian terms of use: personal, educational and non-commercial use, with creditGlobal Volcanism Program, Smithsonian Institution: Volcanoes of the World v5.3, https://doi.org/10.5479/si.GVP.VOTW5-2025.5.3Source page