The April 21, 1918 earthquake
M6.7San Jacinto, California
A magnitude 6.7 earthquake 6.2 miles deep, centred in Riverside County. The 16th strongest in California’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 6.7
- moment magnitude (mw)
- Depth
- 6.2 mi
- 10.0 km below the surface
- Local time
- Sunday, April 21, 1918
- 15:32 PDT; 22:32 UTC
- In California’s record
- 16th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem913126 (“The 1918 San Jacinto, California Earthquake”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Riverside CountyCA · inside
- San Bernardino CountyCA · 17.0 mi
- Orange CountyCA · 26.3 mi
- San Diego CountyCA · 26.6 mi
- Los Angeles CountyCA · 47.0 mi
Cities, largest first
- AnaheimCA · 45.6 mi
- RiversideCA · 27.1 mi
- IrvineCA · 46.3 mi
- San BernardinoCA · 32.1 mi
- FontanaCA · 37.0 mi
- Moreno ValleyCA · 17.4 mi
- OntarioCA · 41.0 mi
- Rancho CucamongaCA · 42.5 mi
- OceansideCA · 41.8 mi
- CoronaCA · 34.8 mi
- PomonaCA · 49.7 mi
- EscondidoCA · 43.9 mi
Earthquakes around the epicentre
2,643 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first
- May 15, 1910M6.0
- September 19, 1907M5.3
- April 10, 1910M5.0
- May 12, 1910M5.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.