Earthquakes near Iwaki through history

It was also the deadliest: NOAA records 18,423 deaths for it. NOAA’s list of significant earthquakes has 46 here, back to AD 799. NOAA records deaths in 24 of the events here, 29,917 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: 30 of the 46 significant earthquakes NOAA lists here are from 1927 on. NOAA lists 13 tsunamis that began within 100 km of Iwaki, and 12 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 1,831 deaths within 100 km of Iwaki. NOAA lists 8 significant eruptions of 4 volcanoes within 100 km of Iwaki. The largest was Bandaisan on July 15, 1888, at 4 on the volcanic explosivity index. It killed 461 people by NOAA’s count.

• March 16, 2022Earthquake · M 7.357 km ENE of Namie, Japan · 4 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• March 11, 2011Earthquake · M 9.12011 Great Tohoku Earthquake, Japan · 18,423 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• March 11, 2011Earthquake · M 7.9Near E Coast HonshuUSGS · NOAA NCEI · Wikipedia
• March 11, 2011Tsunami · 21.1 m hereHonshu Island · 1,831 deaths here (NOAA)NOAA NCEI · Wikipedia
• July 15, 1888Eruption · VEI 4Bandaisan · 461 deaths (NOAA)NOAA NCEI · Wikipedia
• September 18, 799Tsunami · 2 m hereKashima, JapanNOAA NCEI

• An event counts for Iwaki 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