The November 3, 1943 earthquake

M6.9near Skwentna, Alaska

A magnitude 6.9 earthquake 9.3 miles deep, centred in Matanuska-Susitna Borough. The 68th strongest in Alaska’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.

The earthquake

Magnitude: 6.9; moment magnitude (mw)
Depth: 9.3 mi; 15.0 km below the surface
Local time: Wednesday, November 3, 1943; 05:32 AWT; 14:32 UTC
Epicentre: 61.81°N, 151.03°W; In Matanuska-Susitna Borough
In Alaska’s record: 68th; strongest of 124,625 since 1900
Within 50 miles: 2; counties; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event iscgem900071 (“27 km SE of Skwentna, Alaska”). 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

Matanuska-Susitna BoroughAK · inside
Kenai Peninsula BoroughAK · 28.3 mi

Earthquakes around the epicentre

2,194 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 26, 1933M6.8
October 22, 1936M6.8
June 13, 1933M6.0
June 19, 1933M5.8
June 12, 1933M5.8
January 17, 1936M5.6

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