Mount Gareloi
| Mount Gareloi | ||
|---|---|---|
 South flank of Mount Gareloi (January 2003) |
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| height | 1573 m | |
| location | Gareloi Island , Aleutian Islands , Alaska | |
| Mountains | Aleutian chain | |
| Coordinates | 51 ° 47 '25 " N , 178 ° 47' 38" W | |
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| Type | Stratovolcano | |
| Last eruption | 17th August 1989 | |
The Gareloi Volcano is a layer of volcanic that the essential part of the island Gareloi in the Aleutian Islands ( Alaska forms).
construction
The volcano has a diameter of eight to ten kilometers at its base, reaches a maximum height of 1,573 meters and has two craters . The more southerly crater covered by fumaroles is larger and measures about 300 meters in diameter, due to the partially slipped south wall. There is a crack in the south wall that was formed when it erupted in 1929 and extends to the coast. The northern crater is covered by lava flows. A cathedral collapse apparently took place on its northwest flank . The Alaska Volcano Observatory mapped the volcano and its surroundings in 2003. In addition, were seismographs installed.
Eruption story
Since the island was discovered in 1741, around twelve eruptions have been recorded, accompanied by lava and pyroclastic flows . Usually first done an outbreak of the main chimney, followed by an explosive gas and ash eruption, in part, by a phreatic explosion . The eruptions were classified with a volcanic explosive index of 1 to 3. Such outbreaks occurred in 1790, 1791, 1792, 1873, 1922, April 1929, 1950, January 17, 1952, August 7, 1980, January 15, 1982, September 4, 1987, and August 17, 1989. Further eruptions in 1760, 1828, 1927 and 1996 have not been confirmed.
The 1929 eruption was the most severe in the recent history of the volcano's exploration. Four new lava flows were created. A large crack with 13 small craters was formed in the southern flank of the mountain. According to the deposits, the eruption was accompanied by pyroclastic and lahar currents .
literature
- Michelle L. Coombs, Robert G. McGimsey and Brandon L. Browne (2008) (PDF). Preliminary Volcano-Hazard Assessment for Gareloi Volcano, Gareloi Island, Alaska (PDF; 3.8 MB). (Scientific Investigations Report 2008-5159.) United States Geological Survey .
- Christina A. Neal, Robert G. McGimsey, Jim Dixon and Dmitry Melnikov (2005). 2004 Volcanic Activity in Alaska and Kamchatka: Summary of Events and Response of the Alaska Volcano Observatory . (Open-File Report 2005-1308.) United States Geological Survey.
- Charles Arthur Wood and Jürgen Kienle (1992). Volcanoes of North America. Cambridge University Press.
Web links
- Mount Gareloi in the Global Volcanism Program of the Smithsonian Institution (English)
Individual evidence
- ↑ Information from the AVO
- ↑ Neal, McGimsey, Dixon and Melnikov, page first
- ^ A b Information from the Smithsonian Institute
- ↑ Information from Volcano World ( Memento of the original from August 14, 2009 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .
