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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 56.07°N
  • 160.47°E

  • 3943 m
    12933 ft

  • 300261
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Ushkovsky.

The Global Volcanism Program has no Weekly Reports available for Ushkovsky.

Index of Monthly 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.

03/1982 (SEAN 07:03) Glacier surge

11/1998 (BGVN 23:11) Earthquakes form distinctive group

Contents of Monthly Reports

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

03/1982 (SEAN 07:03) Glacier surge

The volcano's 17-km-long Bilchenok Glacier has begun to advance. The glacier, located in Plosky's caldera, has three large ice cascades on its NW flank. Previous surges of this glacier occurred in 1959, 1976, and 1977. Photo reconaissance flights over Kamchatkan glaciers 10-11 March revealed that Bilchenok's front was 1 km from its 1980 position and 500 m from the 1959 maximum surge. Its surface was broken into blocks, and rupture disturbances of the snow cover were observed.

Further Reference. Ovsyannikov, A.A., Khrenov, A.P., and Murav'yeva, Y.D., 1985, Recent activity of the Dal'nya Ploskaya volcano: Volcanology and Seismology, no. 5, p. 97-98.

Information Contacts: V. Vinogradov, IVP.

11/1998 (BGVN 23:11) Earthquakes form distinctive group

On the basis of waveform features and locations, earthquakes in the vicinity of the volcano during November were identified as constituting a separate group. Since September 1998 more than 20 events with magnitudes ranging from 0.5 to 1.0 occurred at shallow depths (<5 km).

Information Contacts: Olga Chubarova, Kamchatka Volcanic Eruptions Response Team (KVERT), Institute of Volcanic Geology and Geochemistry, Piip Ave. 9, Petropavlovsk-Kamchatsky, 683006, Russia; Tom Miller, Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL:, b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA.

Ushkovsky volcano (formerly known as Plosky) is a large compound volcanic massif located at the NW end of the Kliuchevskaya volcano group. It consists of the flat-topped 3943-m-high Ushkovsky (Daljny Plosky), which is capped by an ice-filled 4.5 x 5.5 km caldera, and the adjacent slightly higher peak of 4108 m Krestovsky (Blizhny Plosky) volcano. Two glacier-clad cinder cones with large summit craters form a high point within the Ushkovsky caldera. Linear zones of cinder cones are found on the SW and NE flanks and on lowlands to the west. The younger caldera at the summit of Plosky Daljny was formed in association with the eruption of large lava flows and pyroclastic material from the Lavovy ShIsh cinder cones at the foot of the volcano about 8600 years ago. The only known historical activity was an explosive eruption from the summit cone in 1890.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1890 Apr Unknown Confirmed 2 Historical Observations
6670 BCE ± 150 years Unknown Confirmed   Radiocarbon (uncorrected) Lavovy Shish cone group & summit caldera
7550 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)

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.

Plosky | Ploskaya | Ushkinskaya | Uskovskii | Ploskye Sopki | Ushkovskaya | Ploski

Feature Name Feature Type Elevation Latitude Longitude
Daljny Plosky
    Dalnyaya Plosky
    Bolshaya Plosky
    Dal'nii Plosky
Shield volcano 3943 m 56° 4' 13" N 160° 28' 12" E
Gorshkov Cone
Herz Cone
    Blizhny Ploski
    Blizhnaya Ploskaya
    Malaya Ploskaya
Stratovolcano 4103 m 56° 7' 0" N 160° 31' 0" E
Lavovy Shish
    Lavovy Shysh
Stratovolcano 2989 m 56° 6' 35" N 160° 34' 48" E
This dramatic photo looks north along the cluster of large stratovolcanoes forming the Kliuchevskaya volcano group. Udina volcano (foreground) and the twin Zimina volcano (middle right) are Holocene centers without historical eruptions. Kamen volcano (top center) and Kliuchevskoi (top right) are Kamchatka's two highest peaks. Ushkovsky volcano (top left) lies at the NW end of the volcano group and has had a single historical eruption. Bezymianny volcano is hidden by clouds below Kamen.

Photo by Oleg Volynets (Institute of Volcanology, Petropavlovsk).
Four volcanoes of the Kliuchevskaya volcano group are visible in this north-looking view. Steam clouds pour from the summit of Bezymianny volcano (foreground), which is dwarfed by sharp-peaked Kamen volcano behind it. Kliuchevskoi volcano, the highest and one of the most active volcanoes of Kamchatka, is at the upper right. The compound Ushkovsky volcano is on the left horizon, with Krestovsky forming the rounded summit and the glacier-covered Ushkovsky caldera visible at the extreme left.

Photo by Oleg Volynets (Institute of Volcanology, Petropavlovsk).
An ash plume rises above the summit of Kliuchevskoi volcano on February 16, 1987. This was part of a long-term eruption during 1986-1990 that included explosive and effusive activity from both summit and flank vents. This dramatic view from the south shows steaming Bezymianny volcano, itself in eruption at this time, at the lower left, sharp-peaked Kamen volcano at the left center, and the broad peak of Ushkovsky volcano on the left horizon.

Photo by Alexander Belousov, 1987 (Institute of Volcanology, Petropavlovsk).
An ash plume from Kliuchevskoi in 1979 is backlit by the sun in this view looking SW from the Kliuchevskoi Volcano Observatory. This was part of a dominantly explosive eruption that took place from August 1977 until 1980. The eruption concluded with explosive activity and lava effusion from a flank vent during March 5-12, 1980. Ushkovsky volcano (also referred to as Plosky volcano) appears at the right, with the small Sredny stratovolcano in the center.

Photo by Yuri Doubik, 1979 (Institute of Volcanology, Petropavlovsk).
Clouds drape the margins of the glacier-covered summit caldera of Ushkovsky (Plosky) volcano in the foreground. The two highest volcanoes in Kamchatka, Kliuchevskoi (left) and Kamen (right) rise above the layer of clouds to the SE. A small ash plume drifts above the summit of Kliuchevskoi, one of Kamchatka's most active volcanoes. No historical eruptions have occurred from the erosionally dissected Kamen volcano, while a single historical eruption, during 1890, has been documented from Ushkovsky volcano.

Photo by Yuri Doubik (Institute of Volcanology, Petropavlovsk).
Ushkovsky volcano (formerly known as Plosky) is a large compound volcanic massif located at the NW end of the Kliuchevskaya volcano group. Seen here from the NW, it consists of the flat-topped 3943-m-high Ushkovsky volcano (far right), which is capped by an ice-filled 4.5 x 5.5 km caldera, and the adjacent higher peak of 4108-m Krestovsky volcano (center). Numerous cinder cones dot its flanks. The volcano has been active during the Holocene, with the last eruption of the summit cone occurring in 1890.

Photo by E.Y. Zhdanova (courtesy of Oleg Volynets, Institute of Volcanology, Petropavlovsk).
Kamen (left), Kliuchevskoi (right), and the broad snow-capped Ushkovsky volcano behind them to the west, anchor the northern end of the Kliuchevskaya volcano group. Ushkovsky consists of the flat-topped Ushkovsky volcano (Daljny Plosky) on the left, which is capped by an ice-filled 4.5 x 5.5 km caldera, and the adjacent slightly higher peak of Krestovsky (Blizhny Plosky) volcano on the right. Kamen and Kliuchevskoi are the two highest peaks in Kamchatka and Kliuchevskoi is also one of its most active volcanoes.

Photo by Phil Kyle, New Mexico Institute of Mining and Technology, 1996 (courtesy of Vera Ponomareva, IUGG, Petropavlovsk).
Symmetrical Kliuchevskoi and the erosionally modified Ushkovsky (also known as Plosky) are two prominent stratovolcanoes visible SW of the town of Kliuchi. The small Sredny stratovolcano, constructed on the eastern flank of Ushkovsky, occupies the saddle between them. Kliuchevskoi is one of Kamchatka's most active volcanoes, while Ushkovsky has had only a single eruption in historical time.

Photo by Vera Ponomareva, 1975 (Institute of Volcanic Geology and Geochemistry, Petropavlovsk).

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.

Braitseva O A, Melekestsev I V, Ponomareva V V, Sulerzhitsky L D, 1995. Ages of calderas, large explosive craters and active volcanoes in the Kuril-Kamchatka region, Russia. Bull Volc, 57: 383-402.

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.

Fedotov S A, Ivanov B V, Dvigalo V N, Kirsanov I T, Murav'ev Y D, Ovsyannikov A A, Razina A A, Seliversov N I, Stepanov V V, Khrenov A P, Chirkov A M, 1985. Activity of the volcanoes of Kamchatka and the Kuril Islands in 1984. Volc Seism, 1985(5): 3-23 (English translation 1989, 7: 647-682).

Fedotov S A, Masurenkov Y P (eds), 1991. Active Volcanoes of Kamchatka. Moscow: Nauka Pub, 2 volumes.

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

Kozhemyaka N N, 1995. Active volcanoes of Kamchatka: types and growth time of cones, total volumes of erupted material, productivity, and composition of rocks. Volc Seism, 16: 581-594 (English translation).

Krijanovsky N, 1934. Volcanoes of Kamchatka. Geol Soc Amer Bull, 45: 529-549.

Ponomareva V V, 1992. . (pers. comm.).

Ponomareva V V, Melekestsev I V, Dirksen O V, 2006. Sector collapses and large landslides on late Pleistocene-Holocene volcanoes in Kamchatka, Russia. J Volc Geotherm Res, 158: 117-138.

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

Volcano Types

Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt
Andesite / Basaltic Andesite


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

Affiliated Databases

Large Eruptions of Ushkovsky 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.