Belknap Crater
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| Belknap Crater | |
|---|---|
 Belknap shield volcano with lava flows in foreground |
|
| Elevation | 6,876 feet (2,096 m)[1] |
| Location | Linn County, Oregon, USA |
| Range | Cascades |
| Coordinates | [2] |
| Topo map | USGS Mount Washington |
| Type | Shield volcano |
| Volcanic arc/belt | Cascade Volcanic Arc |
| Last eruption | about 1500 years ago[3] |
| Easiest route | hike |
Portions of this article include public domain text from the USFS Deschutes & Ochoco National Forests - Crooked River National Grassland.
Belknap Crater is a shield volcano in the Cascade Range in Oregon, USA.[4] It is within the Mount Washington Wilderness area.
Belknap volcano is an great Holocene example of the process which built the High Cascade Platform during the Pleistocene. Small shield volcanoes with a capping cinder cone.[5]
A number of other eruptions also occurred in the general area during roughly the same time period. About 1,300 calendar years ago (1,330 14C years B.P.) a series of small spatter conespatter cones formed between Belknap and Blue Lake. North of these, a phreatic explosion blasted out the crater which is today occupied by Blue Lake. To the south there are a number of cinder cones and associated lava flows, including Collier, Four-in-One, and Yapoah cones. Four-in-One Cone has been dated at about 1,900 calendar yrs old (1,980 14C years B.P.) while Collier is dated at about 1,500 calendar yrs old (1,600 14C years B.P.)[5]
[edit] Notable Vents
| Name | Elevation | Location | Last eruption | |
| meters | feet | Coordinates | ||
| Blue Lake[5] | - | - | - | - |
| Spatter Cone Chain[5] | - | - | - | - |
| Belknap Crater[5] | - | - | - | - |
| Little Belknap[5] | - | - | - | - |
| South Belknap Cone[5] | - | - | - | - |
| Yapoah Cone[5] | - | - | - | - |
| Four-in-One Cone[5] | - | - | - | ~1,900 years ago |
| Collier Cone[5] | - | - | - | ~1,500 years ago |
[edit] References
- ^ NGS Data Sheet for Belknap Crater. U.S. National Geodetic Survey. Retrieved on 2008-03-31.
- ^ USGS GNIS: Belknap Crater
- ^ USGS Cascades Volcano Observatory
- ^ Smithsonian Institution Global Volcanism Program: Belknap. Retrieved on 2008-05-14.
- ^ a b c d e f g h i j Oregon Volcanoes - Belknap Volcanic Field. Deschutes & Ochoco National Forests - Crooked River National Grassland. United States Forest Service (2003-11-26). Retrieved on 2008-05-14.
- Harris, Stephen L. (2005). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes (3rd ed.). Mountain Press Publishing Company, pp. 195–8. ISBN 0-87842-511-X.
- Wood, Charles A.; Jürgen Kienle, eds. (1990). Volcanoes of North America. Cambridge University Press, pp. 182–3. ISBN 0-521-43811-X.
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