Hokkaido-Komagatake

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 42.063°N
  • 140.677°E

  • 1131 m
    3710 ft

  • 285020
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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-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


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 Observations
1998 Oct 25 1998 Oct 25 Confirmed 2 Historical Observations 1996 crater
1996 Mar 5 1996 Mar 12 (?) Confirmed 1 Historical Observations 1929 crater and summit crater fissure
1942 Nov 16 1942 Nov 18 Confirmed 3 Historical Observations NW-SE 1.6-km fissure
1937 Mar 17 1937 Mar 19 Confirmed 1 Historical Observations
[ 1935 Oct 15 ] [ 1935 Oct 15 ] Uncertain    
[ 1935 Jul 8 ] [ Unknown ] Discredited    
1929 Jun 17 1929 Sep 6 Confirmed 4 Historical Observations SE and NE of Ansei Crater, Layer Ko-a
1928 Mar 28 Unknown Confirmed 1 Historical Observations
1924 Jul 31 Unknown Confirmed 2 Historical Observations
1923 Feb 27 1923 Mar 15 Confirmed 2 Historical Observations
1922 May 22 Unknown Confirmed 2 Historical Observations
1919 Jun 17 1919 Jul 26 Confirmed 2 Historical Observations SE of Ansei Crater
1905 Aug 19 1905 Sep 1 (?) Confirmed 2 Historical Observations South of Ansei Crater
1888 Apr 14 Unknown Confirmed 2 Historical Observations NW side of 1856 (Ansei) crater
1856 Sep 25 Unknown Confirmed 4 Historical Observations 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 Observations Tephra layer Ko-c2
1640 Jul 31 1640 Oct 9 Confirmed 5 Historical Observations 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 following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. 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. Additional discussion of data sources can be found under Volcano Data Criteria.

Japan Meteorological Agency, 1996. National Catalogue of the Active Volcanoes in Japan (second edition). Tokyo: Japan Meteorological Agency, 502 p (in Japanese).

Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.

Katsui Y, Komuro H, 1984. Formation of fractures in Komagatake volcano, Hokkaido. Hokkaido Univ Fac Sci Jour, 21: 183-195.

Katsui Y, Suzuki T, Soya T, Yoshihisa Y, 1989. Geological map of Hokkaido-Komagatake volcano. Geol Surv Japan, 1:50,000 geol map.

Katsui Y, Yokoyama I, Fujita T, Ehara S, 1975. Komagatake. Report of the Volcanoes in Hokkaido, Part 4. Sapporo: Committee Prevention Natural Disasters Hokkaido, 194 p (in Japanese).

Kudo T, Hoshizumi H, 2006-. Catalog of eruptive events within the last 10,000 years in Japan, database of Japanese active volcanoes. Geol Surv Japan, AIST, http://riodb02.ibase.aist.go.jp/db099/eruption/index.html.

Kuno H, 1962. Japan, Taiwan and Marianas. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 11: 1-332.

Murayama I, 1987. Volcanoes of Japan (I). Tokyo: Daimedo, 315 p (2nd edition, in Japanese).

Nakagawa M, Furukawa R, Yoshimoto M, 2003. Calderas and active volcanoes in southwestern Hokkaido. IUGG 2003 Field Trip Guidebook, Volc Soc Japan, p 1-35.

Nakagawa M, Nogami K, Ishizuka Y, Yoshimoto M, Takahashi R, Ishii E, Egusa M, Miyamura J, Shiga T, Okazaki N, Ishimaru S, 2001. The 2000 eruption of Hokkaido-Komagatake volcano and its significance: evidence for increasing effect of magma deduced from temporal variations of eruptive materials and adhered gas component on ash. Bull Volc Soc Japan (Kazan), 46: 295-304 (in Japanese with English abs).

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. Quaternary Volcanoes of Japan. Geol Surv Japan, AIST, http://www.aist.go.jp/RIODB/strata/VOL_JP/.

Takahashi R, Nakagawa M, Nakanishi K, Yoshimoto M, 2004. The 1942 eruption of Hokkaido-Komagatake volcano was phreatomagmatic. Bull Volc Soc Japan (Kazan), 49: 129-142 (in Japanese with English abs).

Takeuchi S, Nakamura M, 2001. Role of precursory less-viscous mixed magma in the eruption of phenocryst-rich magma: evidence from the Hokkaido-Komagatake 1929 eruption. Bull Volc, 63: 365-376.

Yoshimoto M, Furukawa R, Nanayama F, Nishimura Y, Nishina K, Uchida Y, Takarada S, Takahashi R, Hirohisa K, 2003. Subaqueous distribution and volume estimation of the debris-avalanche deposit from the 1640 eruption of Hokkaido-Komagatake volcano, southwest Hokkaido, Japan. J Geol Soc Japan, 109: 595-606 (in Japanese with English abs).

Yoshimoto M, Ui T, 1998. The 1640 sector collapse of Hokkaido Komagatake volcano, northern Japan. Bull Volc Soc Japan (Kazan), 43: 137-148 (in Japanese with English abs).

The truncated Hokkaido-Komagatake volcano on the Oshima Peninsula of southern Hokkaido is one of the most active volcanoes of Japan's northernmost island. The 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 CE. Hummocky debris avalanche material occurs at the base of the volcano on three sides. Much of the andesitic 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.