Ketoi

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 47.35°N
  • 152.475°E

  • 1172 m
    3844 ft

  • 290200
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Weekly Report: 28 August-3 September 2013


SVERT reported that a possible thermal anomaly over Ketoi's Pallas Peak was detected in satellite images on 26 August and 1 September. The Aviation Color Code remained at Yellow.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


Most Recent Bulletin Report: March 1989 (SEAN 14:03)


Fumaroles very active on Pallas Peak

During a 14 January overflight, a group of highly active fumaroles was noted on the N slope of Pallas Peak's S cone, on the E margin of Ketoi caldera.

Information Contacts: G. Steinberg, Yuzhno-Sakhalinsk.

Index of Weekly Reports


2013: January | July | August
2010: May

Weekly Reports


28 August-3 September 2013

SVERT reported that a possible thermal anomaly over Ketoi's Pallas Peak was detected in satellite images on 26 August and 1 September. The Aviation Color Code remained at Yellow.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


14 August-20 August 2013

SVERT reported that a thermal anomaly over Ketoi's Pallas Peak was detected in satellite images on 12 August. The Aviation Color Code remained at Yellow.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


7 August-13 August 2013

SVERT reported that a thermal anomaly over Ketoi's Pallas Peak was detected in satellite images during 5-7 and 9 August, and possibly during 10-11 August. Steam-and-gas emissions were detected on 9 August. The Aviation Color Code remained at Yellow.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


31 July-6 August 2013

SVERT reported that during 29-31 July a thermal anomaly from Ketoi's Pallas Peak was observed in satellite imagery. Gas-and-steam emissions were also observed on 29 July, and possibly observed on 31 July and 4 August. The Aviation Color Code remained at Yellow.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


24 July-30 July 2013

SVERT reported that on 25 July a thermal anomaly from Ketoi's Pallas Peak was observed in satellite imagery along with gas-and-steam emissions drifting 100 km NW. On 27 July gas-and-steam emissions possibly containing ash drifted 45 km SSE.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


16 January-22 January 2013

SVERT reported that gas-and-steam emissions from Ketoi's Pallas Peak were observed in satellite imagery during 16-17 January.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


5 May-11 May 2010

SVERT reported that increased fumarolic activity from Ketoi was noted in satellite imagery on 4 May.

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) Intense fumarolic activity on the N slope

04/1987 (SEAN 12:04) Fumarolic activity

03/1989 (SEAN 14:03) Fumaroles very active on Pallas Peak




Bulletin Reports

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


12/1981 (SEAN 06:12) Intense fumarolic activity on the N slope

Intense fumarolic activity was occurring on the outer N slope [of Pallas Peak during the 20 September 1981 overflight]. There were sulfur deposits near the fumaroles. However, no apparent fumarolic or solfataric activity was observed at Zavaritski Caldera (46.925°N, 151.95°E) or Prevo Peak (47.02°N, 152.12°E). Both are on Simushir, the island immediately SW of Ketoi.

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

04/1987 (SEAN 12:04) Fumarolic activity

Moderate fumarolic activity was noted on the outer N slope of Pallas Peak's main crater area during an 11 October aerial survey.

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

03/1989 (SEAN 14:03) Fumaroles very active on Pallas Peak

During a 14 January overflight, a group of highly active fumaroles was noted on the N slope of Pallas Peak's S cone, on the E margin of Ketoi caldera.

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

The circular, 10-km-wide Ketoi island, which rises across the 19-km-wide Diana Strait from Simushir Island, hosts of one of the most complex volcanic structures of the Kuril Islands. The rim of a 5-km-wide Pleistocene caldera is exposed only on the NE side. A younger 1172-m-high stratovolcano forming the NW part of the island is cut by a horst-and-graben structure containing two solfatara fields. A 1.5-km-wide freshwater lake fills an explosion crater in the center of the island. Pallas Peak, a large andesitic cone in the NE part of the caldera, is truncated by a 550-m-wide crater containing a brilliantly colored turquoise crater lake. Lava flows from Pallas Peak overtop the caldera rim and descend nearly 5 km to the SE coast. The first historical eruption of Pallas Peak, during 1843-46, was its largest.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 2013 Jul 25 ] [ 2013 Aug 12 (continuing) ] Uncertain     Pallas Peak
1960 Sep 27 Unknown Confirmed 2 Historical Observations Pallas Peak
1924 Unknown Confirmed 2 Historical Observations Pallas Peak
1843 Jul 1846 Confirmed 2 Historical Observations Pallas Peak

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

Sirahata | Sironemuri | Ketoi-jima | Ketoy

Cones

Feature Name Feature Type Elevation Latitude Longitude
Pallas Peak Stratovolcano 1002 m
Clouds surround the circular, 10-km-wide Ketoi Island in this Space Shuttle view (with north to the upper left). A dark-colored 1.5-km-wide freshwater lake (bottom center) fills a large explosion crater. Above it and to its right, clouds drape the summit of Pallas Peak, a post-caldera cone with its own crater lake. The rim of a 5-km-wide caldera in the NE part of the island is visible at the top center. Lava flows from Pallas Peak overtop the caldera rim and descend to the SE coast. The first historical eruption of Pallas Peak, during 1843-46, was its largest.

NASA Space Shuttle image ISS005-E-6024, 2002 (http://eol.jsc.nasa.gov/).

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.

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

Volcano Types

Stratovolcano
Caldera
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Oceanic crust (< 15 km)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
1
10
11
90

Affiliated Databases

Large Eruptions of Ketoi 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.