The December 31, 1956 earthquake
M5.1near Bridgeport, California
A magnitude 5.1 earthquake, centred in Mono County. The 382nd strongest in California’s record since 1900, and the strongest within 50 miles since a magnitude 5.2 on August 8, 1955.
The earthquake
- Magnitude
- 5.1
- local magnitude (ml)
- Depth
- —
- Not recorded
- Local time
- Monday, December 31, 1956
- 09:39 PST; 17:39 UTC
- In California’s record
- 382nd
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis2117 (“23 km E of Bridgeport, 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
- Mono CountyCA · inside
- Lyon CountyNV · 10.0 mi
- Mineral CountyNV · 10.0 mi
- Tuolumne CountyCA · 24.5 mi
- Douglas CountyNV · 26.3 mi
- Alpine CountyCA · 33.3 mi
- Mariposa CountyCA · 37.5 mi
- Madera CountyCA · 38.7 mi
- Esmeralda CountyNV · 40.0 mi
- Fresno CountyCA · 48.1 mi
Earthquakes around the epicentre
2,338 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
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.