Ketoi

Photo of this volcano
  • 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 Citation IconCite this Report


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: September 2015 (BGVN 40:09) Citation IconCite this Report


Thermal anomalies and large gas-and-steam emissions during July-August 2013

Pallas Peak, the large cone in the caldera on Ketoi Island in the central Kurile Islands, last erupted in September 1960. Scientists on monitoring flights during the 1980's sometimes observed fumarolic activity on the outer N slope of Pallas Peak (SEAN 06:12, 12:04, and 14:03), and the Sakhalin Volcanic Eruption Response Team (SVERT) reported increased fumarolic activity based on satellite imagery analysis on 4 May 2010.

Gas-and-steam emissions from Pallas Peak were again observed in satellite imagery during 16-17 January 2013. On 25 and 29-30 July 2013 a thermal anomaly on Pallas Peak was detected in satellite data. Gas-and-steam emissions were also observed drifting 100 km NW on 25 July. On 27 July gas-and-steam emissions possibly containing ash drifted 45 km SSE. Though this eruption was uncertain, SVERT raised the alert level to Yellow.

Additional gas-and-steam emissions were observed on 29 July, and possibly again on 31 July, 4 August, and 9 August 2013. Thermal anomalies were identified during 5-7, 9, possibly 10-11, 12, and possibly 26 August. After another possible thermal anomaly on 1 September there were no further reports of anomalous activity by SVERT.

A copyrighted photo taken by Joseph Szeles from a ship on 15 January 2014 showed a small fumarolic plume rising from the caldera.

Information Contacts: Sakhalin Volcanic Eruption Response Team (SVERT), Institute of Marine Geology and Geophysics, Far Eastern Branch, Russian Academy of Science, Nauki st., 1B, Yuzhno-Sakhalinsk, Russia, 693022 (URL: http://www.imgg.ru/en/, http://www.imgg.ru/ru/svert/reports); Joseph Szeles, Brussels, Belgium (URL: https://www.flickr.com/photos/jo_sze/11962181276/)

Weekly Reports - Index


2013: January | July | August
2010: May


28 August-3 September 2013 Citation IconCite this Report


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 Citation IconCite this Report


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 Citation IconCite this Report


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 Citation IconCite this Report


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 Citation IconCite this Report


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 Citation IconCite this Report


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 Citation IconCite this Report


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

Source: Sakhalin Volcanic Eruption Response Team (SVERT)


Bulletin Reports - Index


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

09/2015 (BGVN 40:09) Thermal anomalies and large gas-and-steam emissions during July-August 2013




Information is preliminary and subject to change. All times are local (unless otherwise noted)


December 1981 (SEAN 06:12) Citation IconCite this Report


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.


April 1987 (SEAN 12:04) Citation IconCite this Report


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.


March 1989 (SEAN 14:03) Citation IconCite this Report


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.


September 2015 (BGVN 40:09) Citation IconCite this Report


Thermal anomalies and large gas-and-steam emissions during July-August 2013

Pallas Peak, the large cone in the caldera on Ketoi Island in the central Kurile Islands, last erupted in September 1960. Scientists on monitoring flights during the 1980's sometimes observed fumarolic activity on the outer N slope of Pallas Peak (SEAN 06:12, 12:04, and 14:03), and the Sakhalin Volcanic Eruption Response Team (SVERT) reported increased fumarolic activity based on satellite imagery analysis on 4 May 2010.

Gas-and-steam emissions from Pallas Peak were again observed in satellite imagery during 16-17 January 2013. On 25 and 29-30 July 2013 a thermal anomaly on Pallas Peak was detected in satellite data. Gas-and-steam emissions were also observed drifting 100 km NW on 25 July. On 27 July gas-and-steam emissions possibly containing ash drifted 45 km SSE. Though this eruption was uncertain, SVERT raised the alert level to Yellow.

Additional gas-and-steam emissions were observed on 29 July, and possibly again on 31 July, 4 August, and 9 August 2013. Thermal anomalies were identified during 5-7, 9, possibly 10-11, 12, and possibly 26 August. After another possible thermal anomaly on 1 September there were no further reports of anomalous activity by SVERT.

A copyrighted photo taken by Joseph Szeles from a ship on 15 January 2014 showed a small fumarolic plume rising from the caldera.

Information Contacts: Sakhalin Volcanic Eruption Response Team (SVERT), Institute of Marine Geology and Geophysics, Far Eastern Branch, Russian Academy of Science, Nauki st., 1B, Yuzhno-Sakhalinsk, Russia, 693022 (URL: http://www.imgg.ru/en/, http://www.imgg.ru/ru/svert/reports); Joseph Szeles, Brussels, Belgium (URL: https://www.flickr.com/photos/jo_sze/11962181276/)

Eruptive History


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 ] 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.

Photo Gallery


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/).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Ketoi in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites