Kisarazu

Earthquakes near Kisarazu through history

From 1900 to October 19, 2026, USGS recorded 48 earthquakes of magnitude 6 or more within 100 km of Kisarazu, or 200 km for magnitude 7 and above. 15 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 6 earthquakes of magnitude 4.5 or more within 100 km of Kisarazu 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 44 here, back to AD 818. NOAA records deaths in 31 of the events here, 142,334 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: 17 of the 44 significant earthquakes NOAA lists here are from 1927 on. NOAA lists 19 tsunamis that began within 100 km of Kisarazu, and 12 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 13 m, on September 1, 1923. The deadliest, on December 30, 1703, killed 1,459 people here by NOAA’s runup records. NOAA lists 9 significant eruptions of 2 volcanoes within 100 km of Kisarazu. 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

  • March 11, 2011Earthquake · M 7.9Near E Coast HonshuUSGS · NOAA NCEI · Wikipedia
  • November 15, 1986Eruption · VEI 3Izu-Oshima · one death (NOAA)NOAA NCEI · Wikipedia
  • September 1, 1923Earthquake · M 8.0Tokyo, Yokohama · 105,385 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
  • September 1, 1923Tsunami · 13 m hereSagami Bay · 344 deaths here (NOAA)NOAA NCEI · Wikipedia
  • December 30, 1703Earthquake · M 8.2 (est.)Off Sw Boso Peninsula · 5,233 deaths (NOAA)NOAA NCEI · Wikipedia
  • December 30, 1703Tsunami · 11.7 m hereOff Sw Boso Peninsula · 1,459 deaths here (NOAA)NOAA NCEI · Wikipedia
  • August 818Earthquake · M 7.9 (est.)TokkaidoNOAA NCEI

Good to know

  • An event counts for Kisarazu 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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