volcano

1889 (or 1990?): Phreatic eruption.

Jul 1922: Phreatic eruption.

1935: Phreatic eruption.

Dec 1944: Phreatic eruption.

28 Mar 1957: Phreatic eruption.

23 Dec 1967: Phreatic eruption ("Milliondollar Hole").

20 Jun 1968: Mud explosion (Motoyama fumarole).

Nov (or Dec?) 1969: Minor phreatic eruption (Kongoiwa).

Nov 1975: Mud eruption (Kitanohana Mud Pit).

Jan 1976: Mud eruption (Asodai Pit Crater).

11 Dec 1978: Minor phreatic eruption (Asodai Pit Crater).

13 Mar 1980: Minor phreatic eruption (Kitanohana Mud Pit).

9, 10 Mar 1982: Minor phreatic eruption (Idogahama).

28, 29 Nov 1982: Minor phreatic eruption (Asodai Pit Crater).

Dec 1982: Seawater discolored 500 m to the south.

27 Oct 1993: Unusual high temperature and sulfur ejection (around Asodai Pit Crater).

15 Nov 1993: Seawater discolored (NE shore).

28 Aug 1994: Minor phreatic eruption (NE part of the island).

10 Sep 1999: Minor phreatic eruption (Asodai Pit Crater).

21 Sep 2001: Minor submarine eruption (150-200 m to the SE).

19 Oct 2001: Phreatic eruption (Idogahama).

6 and 8 Jun 2004: Minor phreatic eruption (Asodai Pit Crater).

10 Feb and 7 Mar 2012: Very minor phreatic eruption (Mud explosion, "Milliondollar Hole").

From 29 to 30 Apr 2012: Seawater discoloration off NE（submarine eruption?).

9 Jul 2012: Very minor phreatic eruption (Mud explosion, "Milliondollar Hole").

17-18 Feb, 5-6 Mar and 44 Apr 2013: Minor phreatic eruption ("Milliondollar Hole").

16 Dec 2014: Minor mud explosion at an abandoned geothermal power plant, 4km ENE of "Milliondollar Hole".

22 May 2015: Minor phreatic eruption (Idogahama).

7 Aug 2015: Minor phreatic eruption (Kitanohana).

12 Sep 2018: Minor submarine eruption (SE shore).

Early Sep 2020: mud eruption, mud flow (Hanareiwa South Crater, NE part of the of island).

28 Dec 2020: Minor phreatic eruption (Asodai Pit Crater).

12 & 23 Aug, 2 &17 Sep 2021: Minor submarine eruptions (SE shore).

11 Jul - 9 Aug, 5-8 Oct, 7-11 Dec 2022: Minor submarine eruptions (SE shore).

15-24, Jun 2023: Minor submarine eruptions (SE shore).

From 21 Oct 2023 to Apr 2024: (intermittently on going) Phreatomagmatic eruptions(SE shore), pumice drifted, new island formed (30 Oct).

3-19 May 2024: Intermittent minor phreatic eruption (Idogahama).

15-21 Jul 2024: minor phreatomagmatic eruption (SE shore).