Kolokol Group

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 46.042°N
  • 150.05°E

  • 1328 m
    4356 ft

  • 290120
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Weekly Report: 26 August-1 September 2009


Based on analyses of satellite imagery, SVERT reported that on 26 August a gas-and-steam plume possibly containing ash rose from Berg (part of the Kolokol Group of volcanoes) to an altitude greater than 6 km (19,700 ft) a.s.l. and drifted NE.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


Most Recent Bulletin Report: April 1987 (SEAN 12:04)


Weak gas emission from the Berg and Trezubetz domes

Weak gas emission from the extrusive domes at Berg and Trezubetz was noted during a 6 November overflight. Five explosive eruptions and one dome-building episode are known between 1845 and 1970.

Information Contacts: G. Steinberg and B. Piskunov, Yuzhno-Sakhalinsk.

Index of Weekly Reports


2009: August

Weekly Reports


26 August-1 September 2009

Based on analyses of satellite imagery, SVERT reported that on 26 August a gas-and-steam plume possibly containing ash rose from Berg (part of the Kolokol Group of volcanoes) to an altitude greater than 6 km (19,700 ft) a.s.l. and drifted NE.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


Index of Bulletin Reports


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

12/1981 (SEAN 06:12) Weak gas release from the Berg and Trezubetz summit domes

04/1987 (SEAN 12:04) Weak gas emission from the Berg and Trezubetz domes




Bulletin Reports

All information contained in these reports is preliminary and subject to change.


12/1981 (SEAN 06:12) Weak gas release from the Berg and Trezubetz summit domes

Very weak gas emission was occurring from the summits of extrusive domes at both Berg and Trezubetz during the 20 September 1981 flight.

Information Contacts: G. Steinberg, Sakhalin Complex Institute.
Download or Cite this Report

04/1987 (SEAN 12:04) Weak gas emission from the Berg and Trezubetz domes

Weak gas emission from the extrusive domes at Berg and Trezubetz was noted during a 6 November overflight. Five explosive eruptions and one dome-building episode are known between 1845 and 1970.

Information Contacts: G. Steinberg and B. Piskunov, Yuzhno-Sakhalinsk.
Download or Cite this Report

A group of Holocene volcanoes in central Urup Island is named after its most prominent volcano, Kolokol. Berg and Trezubetz volcanoes, flanking Kolokol on the NW, have breached summit calderas partially filled by lava domes. Trezubetz, whose name means "trident," has an eroded crater rim with three large peaks when seen at sea from the north. Kolokol volcano rises to 1328 m and is sometimes known as Urup-Fuji because of its symmetrical profile. The crater of Kolokol is not well preserved, but the volcano displays no evidence of glacial erosion. Several lava flows originate from Kolokol; one of these extends almost to the Sea of Okhotsk coast. A viscous lava flow armoring the SE flank is probably the most recent from Kolokol. Borzov volcano, the oldest of the group, lies to the SW of Kolokol. Eruptions of the Kolokol volcano group have been observed in historical time since the late-18th century. Berg volcano has been most active, but Trezubetz erupted in 1924.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 2009 Aug 26 ] [ Unknown ] Uncertain 2   Berg
[ 2005 ] [ Unknown ] Uncertain 1   Berg
1973 Jul 25 1973 Jul 26 (?) Confirmed 1 Historical Observations Berg (northern part of lava dome)
1970 Feb 1970 Mar Confirmed 3 Historical Observations Berg
1952 Jan 15 ± 45 days Unknown Confirmed 2 Historical Observations Berg
1946 Apr 15 ± 45 days Unknown Confirmed 2 Historical Observations Berg
1940 ± 6 years Unknown Confirmed   Historical Observations Berg
1924 Mar 13 Unknown Confirmed 2 Historical Observations Trezubetz
1894 Jul 25 1894 Jul 26 Confirmed 2 Historical Observations Berg ?
1845 1846 Confirmed 2 Historical Observations Berg
1780 ± 10 years Unknown Confirmed 2 Historical Observations

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
Berg Somma volcano 1040 m 46° 4' 0" N 150° 5' 0" E
Borzov Cone
Kolokol
    Uruppu Fudzi
    Urup-Fuji
Stratovolcano 1328 m 46° 3' 0" N 150° 3' 29" E
Trezubetz
    Dzigoku
    Jigoku Yama
    Zigoku
Somma volcano 1220 m 46° 4' 0" N 150° 7' 0" E
Berg volcano, seen here from the SE, is part of a closely spaced group of Holocene volcanoes in central Urup Island that is named after its most prominent symmetrical volcano, Kolokol. Berg, which has a 2-km-wide caldera breached to the NW that contains a large lava dome, is the most recently active of the group. Steam rises from an explosion crater on the NW side of the 250-m-high lava dome and a prominent explosion crater (center) cuts its southern side. Eruptions of Berg have been documented since the late-18th century.

Photo by A. Samoluk, 1990 (courtesy of Genrich Steinberg, Institute for Marine Geology and Geophysics, Yuzhno-Sakhalinsk).
A steaming lava dome partially fills the breached summit caldera of Berg volcano, with conical Kolokol volcano in the background to the south. They are part of a group of Holocene volcanoes in central Urup Island that is named after its most prominent volcano, Kolokol. Berg and Trezubetz volcanoes, flanking Kolokol on the NW, have breached summit calderas partially filled by lava domes. Kolokol volcano rises to 1328 m and is sometimes known as Urup-Fuji because of its symmetrical profile.

Photo courtesy of Alexandr Rybin (Institute of Marine Geology and Geophysics, Yuzhno-Sakhalin).

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.

Gorshkov G S, 1958. Kurile Islands. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 7: 1-99.

Gorshkov G S, 1970. Volcanism and the Upper Mantle; Investigations in the Kurile Island Arc. New York: Plenum Publishing Corp, 385 p.

Volcano Types

Somma(es)
Stratovolcano

Tectonic Setting

Subduction zone
Intermediate crust (15-25 km)

Rock Types

Major
Andesite / Basaltic Andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
2
2
128
375

Affiliated Databases

Large Eruptions of Kolokol Group 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.