Aihara

Earthquakes near Aihara, 1927–2026

From 1927 to October 19, 2026, USGS recorded 19 earthquakes of magnitude 6 or more within 100 km of Aihara, or 200 km for magnitude 7 and above. One stands far above the rest: a magnitude 7.9 on March 11, 2011 (Near E Coast Honshu). The next strongest reached 6.9.

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The last 30 days · as of

USGS recorded 4 earthquakes of magnitude 4.5 or more within 100 km of Aihara in the last 30 days.

The latest: magnitude 4.5 on October 21 (2 km N of Honchō, Japan). The strongest: magnitude 4.9 on September 28 (5 km S of Sakai, Japan).

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What the record holds

The deadliest was not the strongest: a magnitude 6.9 on November 25, 1930 (5 km WSW of Atami, Japan), for which NOAA records 259 deaths. 15 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 15 of the events here, 326 in all. The ten years with the most magnitude 6+ earthquakes were 1927–1936, with 6 of the 19. NOAA lists 3 tsunamis that began within 100 km of Aihara, and 7 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 4.72 m, on March 11, 2011. NOAA lists 8 significant eruptions of 2 volcanoes within 100 km of Aihara. The largest was Izu-Oshima on November 15, 1986, at 3 on the volcanic explosivity index. It killed one person by NOAA’s count.

The events

Good to know

  • An event counts for Aihara 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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