NOAA「Last Known Eruption」により区分、赤はD1、橙はD2
  • D1: 1964 or later (Red)
  • D2: 1900-1963 (Orange)
  • D3: 1800-1899
  • D4: 1700-1799
  • D5: 1500-1699
  • D6: A.D. 1-1499
  • D7: B.C. (Holocene)
  • U: Undated, but probable Holocene eruption
  • Q: Quaternary eruption(s) with the only known Holocene activity being hydrothermal
  • ?: Uncertain Holocene eruption