Alney-Chashakondzha

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 56.7°N
  • 159.65°E

  • 2598 m
    8521 ft

  • 300450
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Alney-Chashakondzha.

The Global Volcanism Program has no Weekly Reports available for Alney-Chashakondzha.

The Global Volcanism Program has no Bulletin Reports available for Alney-Chashakondzha.

The glacier-capped Alney-Chashakondzha complex, one of the largest volcanoes of the Sredinny Range, consists of two large mostly Pleistocene andesitic stratovolcanoes constructed on a large Pliocene shield volcano. Both 2598-m-high Alney on the north and 2526-m-high Chashakondzha on the south are capped with andesitic lava domes. Three rhyodacitic-to-rhyolitic lava domes and associated lava flows were emplaced along ring faults enclosing a 15 x 20 km area. Two cinder cones on the east flanks of Alney and Chashakondzha volcanoes erupted about 2600 years ago and produced lava flows, one of which traveled as far as 9 km down the eastern flanks of the complex. Alney is one of the few large stratovolcanoes in the Sredinny Range known to have been active throughout the Holocene, with more than 30 documented pyroclastic deposits. The last intense eruption took place about 350 years ago.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1600 (?) Unknown Confirmed   Radiocarbon (uncorrected) Alney volcano
0650 BCE ± 75 years Unknown Confirmed 3 Radiocarbon (uncorrected) East flank of Alney (Kireunsky)
0660 BCE ± 75 years Unknown Confirmed 3 Radiocarbon (uncorrected) E of Chashakondzha (Levaya Belaya)

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Cones

Feature Name Feature Type Elevation Latitude Longitude
Alney
    Alnei
Stratovolcano 2598 m 56° 42' 0" N 159° 39' 0" E
Chashakondzha Stratovolcano 2526 m 56° 37' 0" N 159° 39' 0" E
Kireunsky Pyroclastic cone 1400 m 56° 41' 0" N 159° 44' 0" E
The glacier-capped Alney-Chashakondzha complex, its summit partially obscured by clouds in this NASA Landsat image (with north to the top), is one of the largest volcanoes of the Sredinny Range. It consists of two large Pleistocene andesitic stratovolcanoes, 2598-m-high Alney on the north and 2526-m-high Chashakondzha on the south, both capped with andesitic lava domes. The Kireunsky lava flow from a vent on the eastern side of the complex was erupted about 2600 years ago.

NASA Landsat7 image (worldwind.arc.nasa.gov)
Glacial canyons descend from the western side of Alney volcano, which along with Chashakondzha volcano, forms one of the largest volcanic complexes of the Sredinny Range. Alney is one of the few large stratovolcanoes in the Sredinny Range known to have been active throughout the Holocene, with more than 30 documented pyroclastic deposits. Cinder cones on the east flanks of Alney and Chashakondzha volcanoes also erupted during the Holocene.

Copyrighted photo by Adam Kirilenko, 2003.
The Kireunsky lava flow was erupted from a vent on the eastern side of the Alney-Chashakondzha volcanic massif (background) about 2600 years ago. The lava flow was erupted from a vent east of Alney volcano on the divide between the Kirevna (far right) and Pravaya Kirevna (left foreground) rivers. Tephra from the Kireunsky eruption almost immediately overlies a tephra from a cinder cone to the south.

Copyrighted photo by Adam Kirilenko, 2002.
The Levaya Belaya lava flow was erupted from a cone 5 km ENE of the summit of Chashakondzha volcano. Flow levees are visible in the middle of the photo, and the Levaya Belaya River has cut a channel along the northern margin of the flow. The Levaya Belaya flow was radiocarbon dated at about 2610 years ago, and tephra from this eruption almost immediately underlies a tephra from another nearby cone 5.5 km east of the summit of Alney volcano.

Copyrighted photo by Adam Kirilenko, 2002.

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Erlich E N, 1986. Geology of the calderas of Kamchatka and Kurile Islands with comparison to calderas of Japan and the Aleutians, Alaska. U S Geol Surv Open-File Rpt, 86-291: 1-300.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Kozhemyaka N N, 1996. Long-lived volcanic centers of Kamchatka: types of cones, growth time spans, volumes of erupted material, productivities, rock proportions, and tectonic settings. Volc Seism, 17: 621-636 (English translation).

Ogorodov N V, Kozhemyaka N N, Vazheevskaya A A, Ogorodov A S, 1972. Volcanoes and the Quaternary Volcanism of the Sredinny Ridge in Kamchatka. Moscow: Nauka Pub, 190 p (in Russian).

Pevzner M M, 2004b. New data on Holocene monogenetic volcanism of the northern Kamchatka: ages and space distribution. IV Internatl Biennial Workshop on Subduction Processes, Petropavlovsk-Kamchatsky, August 21-27, 2004, Abs.

Pevzner M M, 2006. Holocene volcanism of Northern Kamchtaka: the spatiotemporal aspect. Trans (Doklady) USSR Acad Sci Earth Sci, 409: 648-651.

Ponomareva V, Melekestsev I, Braitseva O, Churikova T, Pevzner M, Sulerzhitsky L, 2007. Late Pleistocene-Holocene volcanism on the Kamchatka Peninsula, northwest Pacific region. In: Eichelberger J, Gordeev E, Izbekov P, Kasahara M, Lees J (eds), Volcanism and Subduction: the Kamchatka Region, {Amer Geophys Union, Geophys Monogr}, 172: 165-198.

Vlasov G M, 1967. Kamchatka, Kuril, and Komandorskiye Islands: geological description. In: {Geol of the USSR}, Moscow, 31: 1-827.

Volcano Types

Stratovolcano
Caldera
Lava dome(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt
Andesite / Basaltic Andesite
Minor
Rhyolite
Dacite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
3
10,679

Affiliated Databases

Large Eruptions of Alney-Chashakondzha Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.