Alnei-Chashakondscha
| Alnei-Chashakondscha | ||
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| height | 2526 m | |
| location | Russia , Kamchatka | |
| Mountains | Sredinny ridge | |
| Coordinates | 56 ° 39 '18 " N , 159 ° 38' 20" E | |
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| Type | Stratovolcano | |
The two stratovolcanoes Alnei and Tschaschakondscha together form the glaciated volcano complex of Alney-Chashakondzha ( Russian Алней-Чашаконджа ), one of the most powerful volcanoes of Sredinny-ridge on the Russian peninsula of Kamchatka . Both volcanoes are andesitic stratovolcanoes, which formed on an older shield volcano . Both volcanic peaks, the northern, 2598 m high Alnei as well as the southern, 2526 m high Tschaschakondscha , have an andesitic lava dome . The two peaks are about 7 kilometers apart.
Two ash cones on the eastern flank of the two volcanoes were formed around 2,600 years ago. The ejected lava flow reached a length of 9 kilometers on the eastern flank of the volcanic complex. Alnei is one of the few large stratovolcanoes of the Sredinny Ridge that was active in the Holocene (for the last 12,000 years). More than 30 pyroclastic deposits have been documented. The last major eruption occurred around 350 years ago. Two more eruptions have been dated using the radiocarbon method . In 650 BC An eruption occurred on the eastern flank of the Alney, with about 180 million cubic meters of lava and 16 million cubic meters of tephra being ejected. In 660 BC In BC (± 75 years) an explosive eruption occurred east of the Chaschakondscha with the ejection of lava with an estimated volume of 190 million cubic meters and tephra with a volume of about 40 million cubic meters.
Web links
- Alnei-Tschaschakondscha in the Global Volcanism Program of the Smithsonian Institution (English)