Kisarazu

Earthquakes near Kisarazu, 1927–2026

From 1927 to October 19, 2026, USGS recorded 34 earthquakes of magnitude 6 or more within 100 km of Kisarazu, or 200 km for magnitude 7 and above. 8 of them reached magnitude 7 or more; the strongest was a magnitude 7.9 on March 11, 2011 (Near E Coast Honshu).

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The last 30 days · as of

USGS recorded 5 earthquakes of magnitude 4.5 or more within 100 km of Kisarazu in the last 30 days.

The latest: magnitude 4.7 on October 11 (6 km ESE of Tōgane, 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 6.9 on November 25, 1930 (5 km WSW of Atami, Japan), for which NOAA records 259 deaths. 17 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 15 of the events here, 330 in all. NOAA lists 3 tsunamis that began within 100 km of Kisarazu, and 6 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 10.1 m, on March 11, 2011. The deadliest here came on March 11, 2011 from a magnitude 9.1 earthquake (Honshu Island): NOAA’s runup records count 20 deaths within 100 km of Kisarazu. NOAA lists 8 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
  • March 11, 2011Tsunami · 10.1 m hereHonshu Island · 20 deaths here (NOAA)NOAA NCEI · Wikipedia
  • November 15, 1986Eruption · VEI 3Izu-Oshima · one death (NOAA)NOAA NCEI · Wikipedia
  • May 23, 1938Earthquake · M 7.769 km ESE of Kitaibaraki, JapanUSGS
  • November 25, 1930Earthquake · M 6.95 km WSW of Atami, Japan · 259 deaths (NOAA)USGS · NOAA 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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