Ghegam Ridge

Photo of this volcano
Google Earth icon
  Google Earth Placemark
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 40.275°N
  • 44.75°E

  • 3597 m
    11798 ft

  • 214070
  • Latitude
  • Longitude

  • Summit

  • Volcano

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.

Basic Data

Volcano Number

Last Known Eruption



1900 BCE

3597 m / 11798 ft


Volcano Types

Volcanic field

Rock Types

Andesite / Basaltic Andesite

Tectonic Setting

Continental crust (> 25 km)


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

Geological Summary

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.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

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).

Eruptive History

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.


Agmagan-Karadag | Gegamsk Upland


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
Pyroclastic cone
Vaghramassar Cone


Feature Name Feature Type Elevation Latitude Longitude
Alapars Dome
Attis Dome
Avazan Dome
Fontan Dome
Gheghassar Dome
Giumoush Dome
Goutansar Dome
Spitaksar Dome

Photo Gallery

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 (
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).

Smithsonian Sample Collections Database

The following 34 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 117574-100 Basaltic dolerite
NMNH 117574-101 Trachybasaltic andesite
NMNH 117574-102 Dacitic obsidian
NMNH 117574-103 Scoria
NMNH 117574-104 Basalt
NMNH 117574-105 Biotite dacite
NMNH 117574-106 Obsidian
NMNH 117574-107 Rhyolite
NMNH 117574-108 Scoria
NMNH 117574-134 Scoria
NMNH 117574-61 Scoria
NMNH 117574-62 Basalt
NMNH 117574-63 Basaltic andesite
NMNH 117574-67 Obsidian
NMNH 117574-68 Rhyolite
NMNH 117574-69 Scoria
NMNH 117574-70 Basalt
NMNH 117574-71 Scoria
NMNH 117574-72 Basalt
NMNH 117574-73 Scoria
NMNH 117574-74 Basalt
NMNH 117574-75 Basalt
NMNH 117574-86 Rhyolitic obsidian
NMNH 117574-87 Rhyodacite
NMNH 117574-90 Obsidian
NMNH 117574-91 Rhyolite
NMNH 117574-92 Obsidian
NMNH 117574-93 Basaltic andesite
NMNH 117574-94 Scoria
NMNH 117574-95 Rhyolite
NMNH 117574-96 Obsidian
NMNH 117574-97 Andesite
NMNH 117574-98 Rhyolite
NMNH 117574-99 Obsidian

Affiliated Sites

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).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.