Kazo

Earthquakes near Kazo through history

From 1900 to October 19, 2026, USGS recorded 29 earthquakes of magnitude 6 or more within 100 km of Kazo, or 200 km for magnitude 7 and above. 13 of them reached magnitude 7 or more; the strongest on either list was an estimated magnitude 8.2 on December 30, 1703 (Off Sw Boso Peninsula).

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The last 30 days · as of

USGS recorded 7 earthquakes of magnitude 4.5 or more within 100 km of Kazo in the last 30 days.

The latest: magnitude 4.5 on October 21 (2 km N of Honchō, Japan). The strongest: magnitude 5.3 on October 1 (0 km NNE of Yōkaichiba, Japan).

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What the record holds

The deadliest was not the strongest: a magnitude 8 on September 1, 1923 (Tokyo, Yokohama), for which NOAA records 105,385 deaths. NOAA’s list of significant earthquakes has 33 here, back to AD 818. NOAA records deaths in 21 of the events here, 154,057 in all. The latest on NOAA’s list is a magnitude 7.9 on March 11, 2011 (Near E Coast Honshu). NOAA’s record here begins in August 818 with an earthquake (Tokkaido). It grows thinner going back: 9 of the 33 significant earthquakes NOAA lists here are from 1927 on. NOAA lists 2 tsunamis that began within 100 km of Kazo, and 14 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 10.5 m, on December 30, 1703. The deadliest here came on December 30, 1703 from a magnitude 8.2 earthquake (Off Sw Boso Peninsula): NOAA’s runup records count 600 deaths within 100 km of Kazo. NOAA lists one significant eruption of one volcano within 100 km of Kazo. The deadliest was Akagisan on September 16, 1947, which killed 699 people by NOAA’s count.

The events

  • March 11, 2011Earthquake · M 7.9Near E Coast HonshuUSGS · NOAA NCEI · Wikipedia
  • September 16, 1947EruptionAkagisan · 699 deaths (NOAA)NOAA NCEI · Wikipedia
  • September 1, 1923Earthquake · M 8.0Tokyo, Yokohama · 105,385 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
  • December 30, 1703Earthquake · M 8.2 (est.)Off Sw Boso Peninsula · 5,233 deaths (NOAA)NOAA NCEI · Wikipedia
  • December 30, 1703Tsunami · 10.5 m hereOff Sw Boso Peninsula · 600 deaths here (NOAA)NOAA NCEI · Wikipedia
  • August 818Earthquake · M 7.9 (est.)TokkaidoNOAA NCEI

Good to know

  • An event counts for Kazo 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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