Earthquakes near Riverside, 1927–2026
From 1927 to October 19, 2026, USGS recorded 8 earthquakes of magnitude 6 or more within 60 mi of Riverside, or 120 mi for magnitude 7 and above. 3 of them reached magnitude 7 or more; the strongest was a magnitude 7.5 on July 21, 1952 (The 1952 Kern County, California Earthquake).
The last 30 days · as of
USGS recorded no earthquake of magnitude 4.5 or more within 60 mi of Riverside in the last 30 days.
What the record holds
The deadliest was not the strongest: a magnitude 6.4 on March 11, 1933 (The 1933 Long Beach, California Earthquake), for which NOAA records 120 deaths. 19 earthquakes here in these years are on NOAA’s list of significant earthquakes. NOAA records deaths in 9 of the events here, 149 in all. The latest on NOAA’s list is a magnitude 5.1 on March 29, 2014 (La Habra, Brea, Fullerton). NOAA lists 4 tsunamis from elsewhere that reached the coast within 60 mi of Riverside with deaths or a metre of water or more. The highest water NOAA records here was 3.05 m, on August 31, 1930. The deadliest here came on August 31, 1930 from a magnitude 5.2 earthquake (S. California): NOAA’s runup records count one death within 60 mi of Riverside.
The events
- March 29, 2014Earthquake · M 5.1La Habra, Brea, FullertonNOAA NCEI
- June 28, 1992Earthquake · M 7.3The 1992 Landers, California Earthquake · 3 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
- July 21, 1952Earthquake · M 7.5The 1952 Kern County, California Earthquake · 12 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
- March 11, 1933Earthquake · M 6.4The 1933 Long Beach, California Earthquake · 120 deaths (NOAA)USGS · NOAA NCEI · Wikipedia
- August 31, 1930Tsunami · 3.05 m hereS. California · one death here (NOAA)NOAA NCEI
Good to know
- An event counts for Riverside 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
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