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Komaga-take

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  • Country
  • Subregion Name
  • Volcano Type
  • Last Known Eruption
  • 1131 m
    3710 ft
  • 42.061°
  • 140.681°
  • Elevation
  •  
  • Latitude
  • Longitude

8 November-14 November 2000

According to an Associated Press article, the JMA stated that at 0739 on 8 November an eruption occurred at Komaga-take, which is 710 km NE of Tokyo on Japan's northernmost island of Hokkaido. The eruption produced an ash cloud and coincided with 10 minutes of volcanic tremor. Ashfall was reported in the nearby town of Shikabe, but due to cloudy conditions the height of the ash plume was not observed. The volcano had previously erupted on 4 and 28 September, and 28 October 2000.

Sources: Associated Press , ABC News - Australian Broadcasting Corporation



 Available Weekly Reports




2000: November |

8 November 2000              Back to Top

According to an Associated Press article, the JMA stated that at 0739 on 8 November an eruption occurred at Komaga-take, which is 710 km NE of Tokyo on Japan's northernmost island of Hokkaido. The eruption produced an ash cloud and coincided with 10 minutes of volcanic tremor. Ashfall was reported in the nearby town of Shikabe, but due to cloudy conditions the height of the ash plume was not observed. The volcano had previously erupted on 4 and 28 September, and 28 October 2000.

Sources: Associated Press , ABC News - Australian Broadcasting Corporation



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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2000 Sep 4 2000 Nov 8 Confirmed 1 Historical
1998 Oct 25 1998 Oct 25 Confirmed 2 Historical 1996 crater
1996 Mar 5 1996 Mar 12 (?) Confirmed 1 Historical 1929 crater and summit crater fissure
1942 Nov 16 1942 Nov 18 Confirmed 3 Historical NW-SE 1.6-km fissure
1937 Mar 17 1937 Mar 19 Confirmed 1 Historical
[ 1935 Oct 15 ] [ 1935 Oct 15 ] Uncertain    
[ 1935 Jul 8 ] [ Unknown ] Discredited    
1929 Jun 17 1929 Sep 6 Confirmed 4 Historical SE and NE of Ansei Crater, Layer Ko-a
1928 Mar 28 Unknown Confirmed 1 Historical
1924 Jul 31 Unknown Confirmed 2 Historical
1923 Feb 27 1923 Mar 15 Confirmed 2 Historical
1922 May 22 Unknown Confirmed 2 Historical
1919 Jun 17 1919 Jul 26 Confirmed 2 Historical SE of Ansei Crater
1905 Aug 19 1905 Sep 1 (?) Confirmed 2 Historical South of Ansei Crater
1888 Apr 14 Unknown Confirmed 2 Historical NW side of 1856 (Ansei) crater
1856 Sep 25 Unknown Confirmed 4 Historical Ansei Crater, Tephra layer Ko-c1
[ 1784 Feb 8 ] [ Unknown ] Uncertain 2  
[ 1765 ] [ Unknown ] Uncertain 2  
[ 1710 Jun 27 ] [ Unknown ] Uncertain    
1694 Jul 4 1694 Jul 6 Confirmed 4 Historical Tephra layer Ko-c2
1640 Jul 31 1640 Oct 9 Confirmed 5 Historical Tephra layer Ko-d
4350 BCE (?) Unknown Confirmed 4 Radiocarbon (corrected) Tephra layer Ko-f
4500 BCE ± 150 years Unknown Confirmed   Tephrochronology NS1 and NS2 tephras
4600 BCE ± 50 years Unknown Confirmed 5 Radiocarbon (corrected) Tephra layer Ko-g

The truncated Komaga-take volcano on the Oshima Peninsula of southern Hokkaido is one of the most active volcanoes of Japan's northernmost island. Komaga-take's sharp-topped 1131-m-high summit lies at the western side of a large breached crater that formed as a result of edifice collapse in 1640 AD. Hummocky debris avalanche material occurs at the base of the volcano on three sides. Much of the andesitic Komaga-take volcano is Pleistocene in age. Two late-Pleistocene and two Holocene plinian eruptions occurred prior to the first historical eruption in 1640, which began a period of more frequent explosive activity. The 1640 eruption, one of the largest in Japan during historical time, deposited ash as far away as central Honshu and produced a debris avalanche that reached the sea. The resulting tsunami caused 700 fatalities. Three plinian eruptions have occurred since 1640; in 1694, 1856, and 1929.