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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 52.7°N
  • 98.98°E

  • 2077 m
    6813 ft

  • 302060
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Jom-Bolok.

The Global Volcanism Program has no Weekly Reports available for Jom-Bolok.

The Global Volcanism Program has no Bulletin Reports available for Jom-Bolok.

Volcano Types

Volcanic field

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

A group of small basaltic cinder cones about 200 km WNW of the SW tip of Lake Baikal form the Jom-Bolok volcanic field. A N-S-trending fissure fed a massive 7.9 cu km alkalic-basalt lava flow that traveled 70 km down the Jom-Bolok (Zhom-Bolok) River about 7130 years BP. A smaller younger but undated lava flow originated from a nearby fissure to the SW. This area is part of the East Sayan volcanic region. Holocene activity at Jom-Bolok took place in the Todzha Basin, which is separated by the Great Sayan Ridge from the Oka Plateau to the southwest, with volcanic activity of early Miocene to early Pliocene age.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
5180 BCE ± 140 years Unknown Confirmed   Radiocarbon (corrected) Jom-Bolok (Atkinson cone)

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.


Oka Upland Volcanic Field | East Sayan Volcanic Field | Oka Plateau | Zhom-Bolok


Feature Name Feature Type Elevation Latitude Longitude
Atkinson Pyroclastic cone
Kropotkin Pyroclastic cone 2077 m 52° 42' 0" N 98° 59' 0" E
Ostanets Group Pyroclastic cone
Peretolchin Pyroclastic cone 2050 m 52° 43' 0" N 98° 58' 0" E
Pertolichina Pyroclastic cone 2050 m 52° 43' 0" N 98° 58' 0" E
Pogranichniy Pyroclastic cone
Stariy Pyroclastic cone 2030 m 52° 36' 0" N 98° 54' 0" E
Treshina Pyroclastic cone
Troynoy Pyroclastic cone

Photo Gallery

The rugged surface of the Jom-Bolok (Zhom-Bolok) lava flow fills the valley of the Oka River. The massive Holocene lava flow traveled 70 km from its source, a cinder cone of the Jom-Bolok volcanic field near the Oka Plateau west of Lake Baikal.

Photo by Jim Luhr, 1991 (Smithsonian Institution).
A group of small basaltic cinder cones were erupted from the Jom-Bolok volcanic field near the Oka Plateau, about 200 km WNW of the SW tip of Lake Baikal. Two of the cinder cones are seen here from the SE. The eroded cone at the lower right is Stariy. The young cone (left center) is Peretolchin volcano, named after a geologist who disappeared in the early 20th century, prior to the Russian revolution. Peretolchin cone was the source of the voluminous 70-km-long Jon-Bolok (Zhom-Bolok) lava flow, one of the world's longest Holocene lava flows.

Photo by Sergei Rasskazov, 1995 (Siberian Branch, USSR Academy of Sciences).
The massive Jom-Bolok (Zhom-Bolok) lava flow, which traveled about 70 km down the Oka River, is seen here near its terminous, where it is 1.5 km wide. An earlier lava flow that was dated at 12,000 +/- 4000 years by thermoluminescence was erosionally dissected, after which the Holocene Jom-Bolok flow traveled down a gorge cut in the older flow.

Photo by Sergei Rasskazov, 1995 (Siberian Branch, USSR Academy of Sciences).


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.

Hasenaka T, Litasov Y, Taniguchi H, Miyamoto T, Fujimaki H, 1999. Cenozoic volcanism in Siberia: a review. Center for Northeast Asian Studies, Tohoku Univ, no 3, p 249-272.

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

Ivanov A V, Arzhannikov S G, Demonterova E I,Arzhannikova A V, 2011. Jom-Bolok Holocene volcanic field in the East Sayan Mts., Russia: structure, style of eruptions, magma compositions, and radiocarbon dating. Bull Volc, 73: 1279-1294.

Rasskazov S V, 1992. . (pers. comm.).

Rasskazov S V, Kunk M J, Luhr J F, Bowring S A, Brandt I S, Brandt S B, Ivanov A V, 1996. Episodes of eruptions and composition variations of the Quaternary lavas in the Baikal Rift System (Ar-Ar and K-Ar dating of volcanism in the Dzhida River area). Russian Geol Geophys, 37(6): 1-12.

Whitford-Stark J L, 1987. . (pers. comm.).

Whitford-Stark J L, 1987. A survey of Cenozoic volcanism on mainland Asia. Geol Soc Amer Spec Pap, 213: 1-74.

Affiliated Databases

Large Eruptions of Jom-Bolok 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.