The September 9, 1931 earthquake
M5.9near Leggett, California
A magnitude 5.9 earthquake 9.3 miles deep, centred in Mendocino County. The 88th strongest in California’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 5.9
- moment magnitude (mw)
- Depth
- 9.3 mi
- 15.0 km below the surface
- Local time
- Wednesday, September 9, 1931
- 05:40 PST; 13:40 UTC
- In California’s record
- 88th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem906999 (“9 km S of Leggett, 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
- Mendocino CountyCA · inside
- Trinity CountyCA · 16.9 mi
- Humboldt CountyCA · 18.3 mi
- Lake CountyCA · 40.6 mi
- Tehama CountyCA · 41.4 mi
- Glenn CountyCA · 42.3 mi
Earthquakes around the epicentre
579 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
- April 28, 1923M5.8
- 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.