The September 9, 1931 earthquake
M5.8near the coast of Northern California
A magnitude 5.8 earthquake, 37.3 miles off Humboldt County. The 108th strongest in California’s record since 1900, and the strongest within 50 miles since a magnitude 6.0 on June 4, 1925.
The earthquake
- Magnitude
- 5.8
- surface-wave magnitude (ms)
- Depth
- —
- Not recorded
- Local time
- Wednesday, September 9, 1931
- 05:40 PST; 13:40 UTC
- In California’s record
- 108th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis880 (“near the coast of Northern California”). 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
- Humboldt CountyCA · 37.3 mi
Earthquakes around the epicentre
2,277 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
- January 22, 1923M7.1
- July 14, 1918M6.5
- April 23, 1906M6.4
- October 28, 1909M6.0
- June 4, 1925M6.0
- April 28, 1923M5.6
- August 20, 1927M5.3
- February 9, 1923M5.0
- September 22, 1930M5.0
- December 11, 1930M5.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.