Earthquakes near Visalia through history

The deadliest was not the strongest: an estimated magnitude 7.8 on March 26, 1872 (Owens Valley), for which NOAA records 27 deaths. NOAA’s list of significant earthquakes has 5 here, back to 1857. NOAA records deaths in 3 of the events here, 41 in all. The latest on NOAA’s list is a magnitude 7.1 on July 6, 2019 (Ridgecrest Earthquake Sequence). NOAA’s record here begins on January 9, 1857 with an earthquake (San Luis Obispo).

• July 6, 2019Earthquake · M 7.1Ridgecrest Earthquake SequenceUSGS · NOAA NCEI
• March 26, 1872Earthquake · M 7.8 (est.)Owens Valley · 27 deaths (NOAA)NOAA NCEI · Wikipedia
• January 9, 1857Earthquake · M 7.9 (est.)San Luis Obispo · 2 deaths (NOAA)NOAA NCEI · Wikipedia

• An event counts for Visalia when it began within 60 mi of its centre, or 120 mi 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