The February 13, 1945 earthquake

M6.0near Stanley, Idaho

A magnitude 6.0 earthquake 6.2 miles deep, centred in Custer County. The 5th strongest in Idaho’s record since 1900, and the strongest within 50 miles since a magnitude 6.1 on July 12, 1944.

The earthquake

Magnitude: 6.0; surface-wave magnitude (ms)
Depth: 6.2 mi; 10.0 km below the surface
Local time: Tuesday, February 13, 1945; 21:01 MWT; 03:01 UTC on Feb 14, 1945
Epicentre: 44.61°N, 115.09°W; In Custer County
In Idaho’s record: 5th; strongest of 3,958 since 1900
Within 50 miles: 7; counties; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event ushis1489 (“44 km NNW of Stanley, Idaho”). 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

Custer CountyID · inside
Valley CountyID · 4.9 mi
Lemhi CountyID · 16.0 mi
Boise CountyID · 21.1 mi
Elmore CountyID · 35.8 mi
Blaine CountyID · 44.1 mi
Idaho CountyID · 45.1 mi

Earthquakes around the epicentre

877 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

July 12, 1944M6.1

USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.