Kofu

Earthquakes near Kofu, 1927–2026

From 1927 to October 19, 2026, USGS recorded 10 earthquakes of magnitude 6 or more within 100 km of Kofu, or 200 km for magnitude 7 and above. None reached magnitude 7: the strongest was a magnitude 6.9 on November 25, 1930 (5 km WSW of Atami, Japan).

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The last 30 days · as of

USGS recorded no earthquake of magnitude 4.5 or more within 100 km of Kofu in the last 30 days.

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What the record holds

It was also the deadliest: NOAA records 259 deaths for it. 7 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 18 of the events here, 356 in all. The ten years with the most magnitude 6+ earthquakes were 1927–1936, with 6 of the 10. The latest on NOAA’s list is a magnitude 5 on July 9, 1989 (Honshu: Ito, Ajiro). NOAA lists 6 tsunamis from elsewhere that reached the coast within 100 km of Kofu with deaths or a metre of water or more. The highest water NOAA records here was 6.1 m, on May 26, 1983. NOAA lists 13 significant eruptions of 2 volcanoes within 100 km of Kofu. The largest was Asamayama on August 20, 1930, at 3 on the volcanic explosivity index. It killed 6 people by NOAA’s count.

The events

  • July 9, 1989Earthquake · M 5.0Honshu: Ito, AjiroNOAA NCEI
  • May 26, 1983Tsunami · 6.1 m hereNoshiro, JapanNOAA NCEI · Wikipedia
  • September 21, 1931Earthquake · M 6.51 km WNW of Kumagaya, Japan · 16 deaths (NOAA)USGS · NOAA NCEI
  • November 25, 1930Earthquake · M 6.95 km WSW of Atami, Japan · 259 deaths (NOAA)USGS · NOAA NCEI
  • August 20, 1930Eruption · VEI 3Asamayama · 6 deaths (NOAA)NOAA NCEI · Wikipedia

Good to know

  • An event counts for Kofu when it began within 100 km of its centre, or 200 km for an earthquake of magnitude 7 or more. Damage can reach further.
  • USGS counts here start at magnitude 6: the catalogue’s smaller quakes thin out going back, where few instruments listened.
  • NOAA lists significant events only: earthquakes that killed, did about $1 million of damage, reached magnitude 7.5 or intensity X, or raised a tsunami, and eruptions and tsunamis by like measures. Magnitudes before 1900 are its estimates from written accounts.
  • Deaths are NOAA’s total for each event, wherever people died, its tsunami and fires included. A tsunami counts the dead its runup records give for this place: NOAA’s total for a tsunami includes its source quake’s.
  • A tsunami from elsewhere counts where one of its runups killed or rose a metre or more.
  • Counted to October 19, 2026, as is the map. The last 30 days ask USGS again.

How the layers work, where their data comes from and what they can’t tell you: Earthquakes, live, The world through history

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