Tomakomai

Earthquakes near Tomakomai, 1927–2026

From 1927 to October 19, 2026, USGS recorded 17 earthquakes of magnitude 6 or more within 100 km of Tomakomai, or 200 km for magnitude 7 and above. 9 of them reached magnitude 7 or more; the strongest was a magnitude 8.1 on March 4, 1952 (1952 Tokachi-Oki Earthquake).

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The last 30 days · as of

USGS recorded one earthquake of magnitude 4.5 or more within 100 km of Tomakomai in the last 30 days.

The latest: magnitude 4.7 on October 21 (33 km NE of Shizunai-furukawachō, Japan).

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What the record holds

The deadliest was not the strongest: a magnitude 7.7 on July 12, 1993 (107 km W of Iwanai, Japan), for which NOAA records 231 deaths. 9 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 11 of the events here, 431 in all. The latest on NOAA’s list is a magnitude 7.6 on December 8, 2025 (2025 Aomori Prefecture, Japan Earthquake). NOAA lists one tsunami that began within 100 km of Tomakomai, and 9 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 4.17 m, on March 11, 2011. NOAA lists 6 significant eruptions of 2 volcanoes within 100 km of Tomakomai. The largest was Hokkaido-Komagatake on June 17, 1929, at 4 on the volcanic explosivity index. It killed 2 people by NOAA’s count.

The events

Good to know

  • An event counts for Tomakomai 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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