Fukutoku-Oka-no-ba

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 24.285°N
  • 141.481°E

  • -29 m
    -95 ft

  • 284130
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

3 February-9 February 2010

According to news articles, JMA reported Surtseyan explosions from Fukutoku-Okanoba, 5 km NE of the island of Minami-Iwo-jima, on 3 February. Steam-and-ash plumes rose 100 m a.s.l. and the surrounding sea turned yellow-green. Video footage of the event was captured by people aboard a Japanese Coast Guard patrol boat. One article stated that the sea in the area had regularly changed colors since the 1950s, most recently in December 2009.

Sources: ITN News, The Mainichi Daily News



 Available Weekly Reports


2010: February
2005: June


3 February-9 February 2010

According to news articles, JMA reported Surtseyan explosions from Fukutoku-Okanoba, 5 km NE of the island of Minami-Iwo-jima, on 3 February. Steam-and-ash plumes rose 100 m a.s.l. and the surrounding sea turned yellow-green. Video footage of the event was captured by people aboard a Japanese Coast Guard patrol boat. One article stated that the sea in the area had regularly changed colors since the 1950s, most recently in December 2009.

Sources: ITN News, The Mainichi Daily News


29 June-5 July 2005

On the evening of 2 July, members of the Japan Coast Guard observed a steam plume rising ~1 km above the sea near the island of Minami-Iwo-jima. On 3 July, JMA confirmed that a small-scale eruption had occurred at the submarine volcano Fukutoku-Okanoba, prompting the Japan Coast Guard to issue a warning against sailing in the area. Observers saw rock and mud rising to the sea's surface near the volcano and a ~1-square-km area of water that had turned orange-brown. As of 4 July, a new island had not formed.

Sources: Daily Yomiuri News, Reuters, Associated Press


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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2010 Feb 3 2010 Apr 8 (?) Confirmed 1 Historical Observations
[ 2005 Sep 11 ] [ 2007 Feb (in or after) ] Uncertain 0  
2005 Jul 2 2005 Jul 21 (?) Confirmed 1 Historical Observations
[ 2002 Dec 19 ] [ 2003 Mar 11 ] Uncertain 0  
[ 2001 Oct 30 ] [ 2002 Jun 19 ] Uncertain 0  
[ 2000 Jul 26 ] [ 2001 Jun 13 ] Uncertain 0  
[ 1999 Sep 8 ] [ 2000 Feb 18 ] Uncertain 0  
[ 1998 Oct 16 ] [ 1999 Jan 12 ] Uncertain 0  
[ 1997 Nov 18 ] [ 1998 May 21 ] Uncertain 0  
[ 1995 Nov 21 ] [ 1997 Jul 28 ] Uncertain 0  
[ 1994 Jul 28 ] [ 1994 Jul 28 ] Uncertain 0  
1992 Nov 10 1993 Sep 9 Confirmed 1 Historical Observations
[ 1991 Jul 19 ] [ 1991 Oct 18 ] Uncertain 0  
[ 1987 Sep 4 ] [ 1991 Feb 6 ] Uncertain 0  
1987 Jul 14 1987 Aug 30 (?) Confirmed 0 Historical Observations
[ 1986 Apr 7 ] [ 1987 Jun 26 ] Uncertain 0  
1986 Jan 18 1986 Mar 28 (?) Confirmed 2 Historical Observations
[ 1976 Aug 2 ] [ 1985 Dec 23 ] Uncertain 0  
1974 Dec 24 1975 Nov 13 Confirmed 2 Historical Observations
1973 Dec 18 1974 Feb 16 Confirmed 2 Historical Observations 3.8 km NNE of Minami-Iwo-jima
[ 1972 Oct 1 ] [ 1972 Oct 1 ] Uncertain 0  
[ 1968 Aug 14 ] [ 1968 Aug 20 ] Uncertain 0  
[ 1968 Feb 9 ] [ 1968 Feb 9 ] Uncertain 0  
[ 1967 Jul 1 ] [ 1967 Jul 1 ] Uncertain 0  
[ 1963 Oct 27 ] [ Unknown ] Uncertain 0  
[ 1962 Jul 1 ] [ 1962 Oct 1 ] Uncertain 0  
[ 1960 Jul 1 ] [ 1960 Sep 1 ] Uncertain 0  
[ 1959 Jul 1 ] [ 1959 Oct 1 ] Uncertain 0  
[ 1958 Jul 1 ] [ 1958 Oct 1 ] Uncertain 0  
[ 1956 Apr 1 ] [ 1956 May 1 ] Uncertain 0  
[ 1955 Apr 1 ] [ 1955 Apr 1 ] Uncertain 0  
[ 1954 Feb 4 ± 4 days ] [ Unknown ] Uncertain 0  
[ 1953 Dec 1 ] [ 1953 Dec 1 ] Uncertain 0  
[ 1952 Jun 20 ] [ 1952 Jun 20 ] Uncertain 0  
[ 1950 Feb 1 ] [ 1950 Feb 1 ] Uncertain 0  
1914 Jan 13 1914 Aug 21 (in or after) Confirmed 3 Historical Observations Shin-Iwo-jima
1904 Nov 14 1905 May 16 (?) Confirmed 3 Historical Observations Shin-Iwo-jima

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.

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.

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/.

Sun C-H, Stern R J, 2001. Genesis of Mariana shoshonites: contribution of the subduction component. J Geophys Res, 106: 589-608.

Volcanological Society of Japan, 1960-96. Bull Volc Eruptions, no 1-33. [Annual reports issued 1 to 3 years after event year, published since 1986 in Bull Volc].

Yuasa M, Murakami F, Saito E, Watanabe K, 1991. Submarine topography of seamounts on the volcanic front of the Izu-Ogasawara (Bonin) Arc. Bull Geol Surv Japan, 42: 703-743.

Fukutoku-Oka-no-ba is a submarine volcano located 5 km NE of the pyramidal island of Minami-Ioto. Water discoloration is frequently observed from the volcano, and several ephemeral islands have formed in the 20th century. The first of these formed Shin-Ioto ("New Sulfur Island") in 1904, and the most recent island was formed in 1986. The volcano is part of an elongated edifice with two major topographic highs trending NNW-SSE, and is a trachyandesitic volcano geochemically similar to Ioto.