Earthquakes near Oaxaca, 1927–2026

The deadliest was not the strongest: a magnitude 7.5 on September 30, 1999 (15 km W of San Baltazar Loxicha, Mexico), for which NOAA records 35 deaths. 19 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 12 of the events here, 165 in all. The ten years with the most magnitude 6+ earthquakes were 1927–1936, with 6 of the 21. The latest on NOAA’s list is a magnitude 7.4 on June 23, 2020 (9 km SE of Santa María Xadani, Mexico).

• June 23, 2020Earthquake · M 7.49 km SE of Santa María Xadani, Mexico · 10 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• September 30, 1999Earthquake · M 7.515 km W of San Baltazar Loxicha, Mexico · 35 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
• June 17, 1928Earthquake · M 8.015 km ESE of San Gabriel Mixtepec, Mexico · 4 deaths (NOAA)USGS · NOAA NCEI
• April 16, 1928Earthquake · M 7.8OaxacaNOAA NCEI

• An event counts for Oaxaca 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