Ghegam Ridge

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 40.275°N
  • 44.75°E

  • 3597 m
    11798 ft

  • 214070
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Ghegam Ridge.

The Global Volcanism Program has no Weekly Reports available for Ghegam Ridge.

The Global Volcanism Program has no Bulletin Reports available for Ghegam Ridge.

The Ghegam Ridge, located in west-central Armenia between the capital city of Yerevan and Lake Sevan, contains a broad concentration of lava domes and pyroclastic cones of Pleistocene-to-Holocene age. The volcanoes and associated lava flows cover a 65-km-long, 35-km-wide area west of Lake Sevan and south of the Hrazdan River and are concentrated along 3 NNW-SSE-trending alignments. Lava flows from the central and eastern clusters flowed into Lake Sevan. Initial explosive eruptions in the volcanic field were followed by the extrusion of rhyolitic obsidian lava domes and flows. The latest activity produced a series of andesitic and basaltic-andesite cinder cones and lava flows. The central and eastern portions of the Ghegam Ridge contains large areas of Holocene eruptions with morphologically fresh lava flows devoid of vegetation.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1900 BCE ± 750 years Unknown Confirmed 0 Anthropology North part of eastern cone cluster

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.



Synonyms
Agmagan-Karadag | Gegamsk Upland


Cones
Feature Name Feature Type Elevation Latitude Longitude
Armagan Cone
Azhdahak Cone
Bogousar Pyroclastic cone
Hambariana Cone
Jrbashyana Cone
Mets Tsougloukh Cone
Sevckar Pyroclastic cone
Tashats-sar Cone
Toumb Pyroclastic cone
Uchtapoliar Cone
Uochtepeh
    Karapetiana
Pyroclastic cone
Vaghramassar Cone


Domes
Feature Name Feature Type Elevation Latitude Longitude
Alapars Dome
Attis Dome
Avazan Dome
Fontan Dome
Gheghassar Dome
Giumoush Dome
Goutansar Dome
Spitaksar Dome
Pyroclastic cones and lava domes dot the surface of snow-covered Ghegam Ridge (upper left), located west of Lake Sevan (right) in west-central Armenia. North lies to the upper right in this NASA Space Shuttle image. The volcanoes and associated lava flows cover a 65-km-long, 35-km-wide area west of Lake Sevan and are concentrated along 3 NNW-SSE-trending alignments. Lava flows from the central and eastern clusters flowed into Lake Sevan at the upper left-hand side of the lake.

NASA Space Shuttle image ISS006-E-42481, 2003 (http://eol.jsc.nasa.gov/).
Snow-capped pyroclastic cones of the Ghegam Ridge volcanic field rise across Lake Sevan from a fishing village on its NE shore. The Ghegam Ridge volcanic field in west-central Armenia covers a 35-km-wide area between the capital city of Yerevan and Lake Sevan. Morphologically youthful lava flows from the central and eastern portions of Ghegam Ridge flowed into Lake Sevan.

Photo by Ivan Savov, 2002 (Smithsonian Institution).

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.

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

Karakhanian A, Djrbashian R, Trifonov V, Philip H, Arakelian S, Avagian A, 2002. Holocene-historical volcanism and active faults as natural risk factors for Armenia and adjacent countries. J Volc Geotherm Res, 113: 319-344.

Karakhanian A, Jrbashyan R, Trifonov V, Philip H, Arakelian S, Avagyan A, Baghdassaryan H, Davtian V, Ghoukassyan Y, 2003. Volcanic hazards in the region of the Armenian nuclear power plant. J Volc Geotherm Res, 126: 31-62.

Sviatlovsky A E, 1959. Atlas of Volcanoes of the Soviet Union. Moscow: Akad Nauk SSSR, 170 p (in Russian with English summary).

Volcano Types

Volcanic field

Tectonic Setting

Intraplate
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Rhyolite
Dacite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
1,265,153
1,265,153
1,265,153
3,151,168

Affiliated Databases

Large Eruptions of Ghegam Ridge 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.