Hitachi

Earthquakes near Hitachi through history

From 1900 to October 19, 2026, USGS recorded 57 earthquakes of magnitude 6 or more within 100 km of Hitachi, or 200 km for magnitude 7 and above. 23 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 2 earthquakes of magnitude 4.5 or more within 100 km of Hitachi in the last 30 days.

The latest: magnitude 4.5 on October 7 (25 km ESE of Iwaki, 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 8 on September 1, 1923 (Tokyo, Yokohama), for which NOAA records 105,385 deaths. NOAA’s list of significant earthquakes has 41 here, back to AD 799. NOAA records deaths in 18 of the events here, 141,850 in all. The latest on NOAA’s list is a magnitude 7.3 on March 16, 2022 (57 km ENE of Namie, Japan). NOAA’s record here begins on September 18, 799 with a tsunami (Kashima, Japan). It grows thinner going back: 20 of the 41 significant earthquakes NOAA lists here are from 1927 on. NOAA lists 6 tsunamis that began within 100 km of Hitachi, and 11 from elsewhere that reached it with deaths or a metre of water or more. The highest water NOAA records here was 21.1 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 470 deaths within 100 km of Hitachi. NOAA lists 3 significant eruptions of one volcano within 100 km of Hitachi. The largest was Nasudake on March 5, 1410, at 3 on the volcanic explosivity index. It killed 180 people by NOAA’s count.

The events

  • March 16, 2022Earthquake · M 7.357 km ENE of Namie, Japan · 4 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
  • March 11, 2011Tsunami · 21.1 m hereHonshu Island · 470 deaths here (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
  • March 5, 1410Eruption · VEI 3Nasudake · 180 deaths (NOAA)NOAA NCEI · Wikipedia
  • September 18, 799Tsunami · 2 m hereKashima, JapanNOAA NCEI

Good to know

  • An event counts for Hitachi 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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