Eruption history
VEI – Volcanic Explosivity Index: 0 = lava outpouring, 4 = like Eyjafjallajökull 2010, 6 = like Pinatubo 1991, 7 = like Tambora 1815. The scale is logarithmic – each step is about 10 times more material.
| Start | End | VEI | Vent and dating |
|---|---|---|---|
| 7 March 2026 | 14 March 2026 | ? | Observations: Reported |
| 15 September 2025 | 16 September 2025 | 1 | Observations: Reported |
| 18 November 2008 | 28 November 2008 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 21 March 2006 | 21 March 2006 | 1 | NE flank of Me-Akan · Observations: Reported |
| 9 November 1998 | 9 November 1998 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 21 November 1996 | 21 November 1996 | 1 | Me-Akan (Ponmachineshiri crater no. 4) · Observations: Reported |
| 5 January 1988 | 18 February 1988 | 1 | Me-Akan (SE rim of Ponmachineshiri) · Observations: Reported |
| 1 May 1984 | 1 May 1984 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 15 June 1966 | 15 June 1966 | 1 | Me-Akan (Nakamachineshiri) · Observations: Reported |
| 15 May 1965 | 15 May 1965 | 1 | Me-Akan (Nakamachineshiri) · Observations: Reported |
| 18 June 1964 | 4 July 1964 | 1 | Me-Akan (Nakamachineshiri) · Observations: Reported |
| 28 April 1962 | 28 April 1962 | 1 | Me-Akan (Nakamachineshiri) · Observations: Reported |
| 16 September 1960 | 16 September 1960 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 15 May 1959 | 16 October 1959 | 1 | Me-Akan (Naka- and Ponmachineshiri) · Observations: Reported |
| 23 February 1958 | 23 February 1958 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 26 February 1957 | 5 September 1957 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 18 March 1956 | 31 October 1956 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 19 November 1955 | 19 November 1955 | 1 | Me-Akan (Ponmachineshiri) · Observations: Reported |
| 7 January 1954 | 13 April 1954 | 1 | Me-Akan (Nakamachineshiri) · Observations: Reported |
| c. 2 July 1808 | — | ? | Me-Akan · Observations: Reported |
| 1780 ± 75 years | — | 1 | Me-Akan · Observations: Reported |
| 1600 ± 50 years | — | ? | Me-Akan · Correlation: Tephrochronology |
| c. 1550 | — | ? | Me-Akan · Correlation: Tephrochronology |
| 1250 ± 300 years | — | ? | Me-Akan (Ponmachineshiri) · Correlation: Tephrochronology |
| c. 950 | — | ? | Me-Akan (Ponmachineshiri) · Correlation: Tephrochronology |
| 600 ± 300 years | — | ? | Akan-Fuji · Correlation: Tephrochronology |
| c. 250 | — | ? | Akan-Fuji · Isotopic: 14C (calibrated) |
| 100 ± 100 years | — | ? | Akan-Fuji · Correlation: Tephrochronology |
| c. 50 BCE | — | 4 | Akan-Fuji · Isotopic: 14C (calibrated) |
| 300 BCE ± 100 years | — | ? | Akan-Fuji · Correlation: Tephrochronology |
| c. 550 BCE | — | ? | Akan-Fuji · Correlation: Tephrochronology |
| 800 BCE ± 250 years | — | ? | Me-Akan (Ponmachineshiri) · Isotopic: 14C (uncalibrated) |
| c. 2,050 BCE | — | ? | Kita-yama, Me-Akan (Ponmachineshiri) · Isotopic: 14C (uncalibrated) |
| c. 3,050 BCE | — | ? | Nishi-yama, O-Akan · Isotopic: 14C (uncalibrated) |
| 3,550 BCE ± 500 years | — | 3 | Me-Akan (Nakamachineshiri) · Isotopic: 14C (uncalibrated) |
| 4,550 BCE ± 500 years | — | ? | Me-Akan (Ponmachineshiri) · Isotopic: 14C (uncalibrated) |
| c. 7,050 BCE | — | 4 | Me-Akan (Nakamachineshiri) · Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#285070)