The December 5, 1930 earthquake

M6.5near Atka, Alaska

A magnitude 6.5 earthquake 49.7 miles deep, 44.6 miles off Aleutians West Census Area. The 187th strongest in Alaska’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.

The earthquake

Magnitude: 6.5; surface-wave magnitude (ms)
Depth: 49.7 mi; 80.0 km below the surface
Local time: Friday, December 5, 1930; 20:03 NST; 07:03 UTC on Dec 6, 1930
Epicentre: 53.00°N, 172.00°W; 44.6 mi from Aleutians West Census Area
In Alaska’s record: 187th; strongest of 124,625 since 1900
Within 50 miles: 1; county; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event ushis856 (“173 km ENE of Atka, 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

Aleutians West Census AreaAK · 44.6 mi

Earthquakes around the epicentre

217 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.

No earlier earthquake of magnitude 5 or more within 50 miles in the catalogue since 1900.

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