Earthquakes near Izumo, 1927–2026

The one on September 10, 1943 was the deadliest: NOAA records 1,400 deaths for it. 5 earthquakes here in these years are on NOAA’s list of significant earthquakes. The latest on NOAA’s list is a magnitude 5.7 on April 8, 2018 (Shimane Prefecture). NOAA lists one tsunami from elsewhere that reached the coast within 100 km of Izumo with deaths or a metre of water or more. The highest water NOAA records here was 3 m, on May 26, 1983.

• April 8, 2018Earthquake · M 5.7Shimane PrefectureUSGS · NOAA NCEI
• May 26, 1983Tsunami · 3 m hereNoshiro, JapanNOAA NCEI · Wikipedia
• September 10, 1943Earthquake · M 7.018 km ENE of Kurayoshi, Japan · 1,400 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• August 13, 1940Earthquake · M 7.0USGS

• An event counts for Izumo 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