Earthquakes in St. Helena, 2017–2026

2022 had the most magnitude 4.5+ earthquakes: 61 of the 115.

• October 19, 2022Earthquake · M 5.881 km ENE of Georgetown, Saint HelenaUSGS
• June 11, 2022Earthquake · M 5.687 km E of Georgetown, Saint HelenaUSGS
• February 10, 2022Earthquake · M 5.5Ascension Island regionUSGS
• August 22, 2020Earthquake · M 5.8178 km ENE of Georgetown, Saint HelenaUSGS
• August 22, 2020Earthquake · M 5.5Ascension Island regionUSGS

• An event counts for St. Helena when it began inside its borders, or at sea within 100 km of its coast (so one can count for two neighbours), or further out, up to 300 km, where St. Helena is the nearest country.
• USGS counts are its ComCat catalogue’s earthquakes of magnitude 4.5 or more, aftershocks included.
• 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.
• The map frames the box around St. Helena, its neighbours’ quakes included, so its count runs higher than this page’s.
• 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