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Ketoi

Photo of this volcano
  • Russia
  • Kuril Islands
  • Stratovolcano
  • 2018 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 47.35°N
  • 152.475°E

  • 1172 m
    3845 ft

  • 290200
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number
Most Recent Weekly Report: 19 September-25 September 2018 Citation IconCite this Report

Based on a report from SVERT the Tokyo VAAC reported that on 21 September an ash plume from Ketoi drifted NE.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)


Most Recent Bulletin Report: October 2018 (BGVN 43:10) Citation IconCite this Report

Plume of uncertain composition reported based on satellite data one day in September

Gas-and-steam emissions were previously reported at Ketoi (figure 1) in January, July, and August 2013 (BGVN 40:09). Intense fumarolic activity originating from the same area, the N slope of Pallas Peak, was reported in 1981, 1987, and 1989. Based on a report from the Sakhalin Volcanic Eruption Response Team (SVERT) using Himawari-8 imagery, the Tokyo VAAC reported an ash plume on 21 September 2018 which drifted to the NE; however, evidence of the plume could not be confirmed by the VAAC from satellite imagery. The original VONA (Volcano Observatory Notice for Aviation) issued by SVERT noted a volcanic cloud without a specific mention of ash, but also remarked that thermal anomalies had been observed on 17 and 20 September.

Figure (see Caption) Figure 1. Natural color Sentinel-2 satellite image of Ketoi on 18 September 2018. A large freshwater lake can be seen SW of the Pallas Peak andesitic cone, which also hosts a crater lake. Lava flows originating from the younger cone extend primarily N to SW, and a white fumarolic area is immediately NE of the crater. The island is approximately 10 km in diameter. Courtesy of Sentinel Hub Playground.

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); Sentinel Hub Playground (URL: https://www.sentinel-hub.com/explore/sentinel-playground).

Weekly Reports - Index


2018: September
2013: January | July | August
2010: May


19 September-25 September 2018 Citation IconCite this Report

Based on a report from SVERT the Tokyo VAAC reported that on 21 September an ash plume from Ketoi drifted NE.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)


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

10/2018 (BGVN 43:10) Plume of uncertain composition reported based on satellite data one day in September




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/)


October 2018 (BGVN 43:10) Citation IconCite this Report

Plume of uncertain composition reported based on satellite data one day in September

Gas-and-steam emissions were previously reported at Ketoi (figure 1) in January, July, and August 2013 (BGVN 40:09). Intense fumarolic activity originating from the same area, the N slope of Pallas Peak, was reported in 1981, 1987, and 1989. Based on a report from the Sakhalin Volcanic Eruption Response Team (SVERT) using Himawari-8 imagery, the Tokyo VAAC reported an ash plume on 21 September 2018 which drifted to the NE; however, evidence of the plume could not be confirmed by the VAAC from satellite imagery. The original VONA (Volcano Observatory Notice for Aviation) issued by SVERT noted a volcanic cloud without a specific mention of ash, but also remarked that thermal anomalies had been observed on 17 and 20 September.

Figure (see Caption) Figure 1. Natural color Sentinel-2 satellite image of Ketoi on 18 September 2018. A large freshwater lake can be seen SW of the Pallas Peak andesitic cone, which also hosts a crater lake. Lava flows originating from the younger cone extend primarily N to SW, and a white fumarolic area is immediately NE of the crater. The island is approximately 10 km in diameter. Courtesy of Sentinel Hub Playground.

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); Sentinel Hub Playground (URL: https://www.sentinel-hub.com/explore/sentinel-playground).

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.

Eruptive History

There is data available for 5 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2018 Sep 21 2018 Sep 21 Confirmed 1 Historical Observations
[ 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
Deformation History

There is no Deformation History data available for Ketoi.

Emission History

There is no Emissions History data available for Ketoi.

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.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Kuril'skiye Ostrova
Publisher: DMA Aerospace Center
Country: Kuril-I
Year: 1989
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of Kuril'skiye Ostrova

Title: Kuril'skye Ostrova
Publisher: DMA
Country: Kuril-I
Year: 1988
Series: TPC
Map Type: Topographic
Scale: 1:500,000
Map of Kuril'skye Ostrova

Title: Historical Japan
Publisher: National Geographic Society
Country: Japan
Year: 1984
Series: National Geographic
Map Type: Geographic
Scale: 1:2,982,000
Map of Historical Japan

Title: Suehiro-Dake
Publisher: US Army Map Service
Country: Japan
Year: 1945
Series: AMS
Map Type: Topographic
Scale: 1:50,000
Map of Suehiro-Dake

Title: Shimushiru-Wan
Publisher: US Army Map Service
Country: Kuril-I
Year: 1945
Series: AMS
Map Type: Topographic
Scale: 1:50,000
Map of Shimushiru-Wan

Title: Shimushiro-To
Publisher: US Army Map Service
Country: Japan
Year: 1944
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Shimushiro-To

Title: Yake-Yama
Publisher: US Army Map Service
Country: Japan
Year: 1944
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Yake-Yama

Title: Ketoi
Publisher: US Army Map Service
Country: Japan
Year: 1944
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Ketoi
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