Avachinsky

Infobox Mountain
Name = Avachinsky
Photo = Avachinsky Volcano.jpg
Caption = Avachinsky, seen from base camp.
Elevation = convert|2741|m|ft|0
Location = Kamchatka, Russia
Range =
Prominence = 1,550 m
Coordinates = coord|53|15|N|158|50|E|type:mountain|display=inline,title
Topographic

Type = Stratovolcano
Age =
Last eruption = 2001
First ascent =
Easiest route = basic rock/snow climb
Translation =
Language =
Listing = Ultra
Pronunciation =

Avachinsky (also known as Avacha or Avacha Volcano or Avachinskaya Sopka) ( _ru. Авачинская сопка, Авача) is an active stratovolcano on the Kamchatka Peninsula in the far east of Russia. It lies within sight of the capital of Kamchatka Krai, Petropavlovsk-Kamchatsky. Together with neighbouring Koryaksky volcano, it has been designated a Decade Volcano, worthy of particular study in light of its history of explosive eruptions and proximity to populated areas.

Geological history

Avachinsky lies on the Pacific Ring of Fire, at a point where the Pacific Plate is sliding underneath the Eurasian Plate at a rate of about 80 mm/year. A wedge of mantle material lying between the subducting Pacific Plate and the overlying Eurasian Plate is the source of dynamic volcanism over the whole Kamchatka Peninsula.

The volcano is one of the most active volcanoes on the Kamchatka Peninsula, and began erupting in the middle to late Pleistocene era. It has a horseshoe-shaped caldera, which formed 30-40,000 years ago in a major landslide which covered an area of 500 km² south of the volcano, underlying the city of Petropavlovsk-Kamchatsky. Reconstruction of a new cone inside the caldera occurred in two major eruption phases, 18,000 and 7,000 years ago. [Droznin D., Levin V., Park J., Gordeev E. (2002), "Detailed Mapping of Seismic Anisotropy Indicators in Southeastern Kamchatka", American Geophysical Union, Fall Meeting 2002] [Levin V., Park J., Gordeev E., Droznin D. (2002), "Complex Anisotropic Structure of the Mantle Wedge Beneath Kamchatka Volcanoes", American Geophysical Union, Fall Meeting 2002] [Taran Y.A., Connor C.B., Shapar V.N., Ovsyannikov A.A., Bilichenko A.A. (1997), "Fumarolic activity of Avachinsky and Koryaksky volcanoes, Kamchatka, from 1993 to 1994", Bulletin of Volcanology, v. 58, p. 441-448]

Recorded history

In his Journal of Captain Cook's Last Voyage, John Ledyard records the eruption of Avachinsky on June 15, 1779. He refers to Koryaksky and Avachinsky as Peter and Paul.:On the 15th it continued calm until noon when it clouded up and became very black and dark: the two mountains Peter and Paul were covered with the atmosphere near half way from their summits down, and at two o'clock we had again a small shock of an earthquake, and heard a hollow rumbling noise in the air, and the atmosphere continuing to condense, it became almost as dark as night, and the face of heaven looked very wild: we singled the stops of the sheet-anchor and eased the ship aloft at all the portentous appearances. Between three and four the mountain Paul exploded with a tremendous shock that convulsed everything around us: The report that attended the explosion was very loud at first, but gradually decreased until it subsided to a sound like that of grumbling distant thunder [ISBN 0-7922-9347-9 p115]

Recent activity

Avachinsky has erupted at least 17 times in recorded history. Eruptions have generally been explosive, and pyroclastic flows and lahars have tended to be directed to the south west by the breached caldera. The most recent large eruption (VEI=4) occurred in 1945, when about 0.25 km³ of magma was ejected. The volcano has since had small eruptions in 1991 and 2001.

The volcano continues to experience frequent earthquakes, and many fumaroles exist near the summit. The temperature of gases emitted at these fumaroles has been measured at over 400°C. In light of its proximity to Petropavlovsk-Kamchatsky, Avachinsky was designated a Decade Volcano in 1996 as part of the United Nations' International Decade for Natural Disaster Reduction, together with the nearby Koryaksky volcano.

References

External links

* [http://volcano.und.nodak.edu/vwdocs/volc_images/north_asia/kamchatka/Avachinsky.html VolcanoWorld information]
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