The June 21, 1928 earthquake

M7.0near Chenega, Alaska

A magnitude 7.0 earthquake 9.3 miles deep, 3.3 miles off Chugach Census Area. The 55th strongest in Alaska’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.

The earthquake

Magnitude: 7.0; moment magnitude (mw)
Depth: 9.3 mi; 15.0 km below the surface
Local time: Thursday, June 21, 1928; 06:27 AST; 16:27 UTC
Epicentre: 60.37°N, 147.29°W; 3.3 mi from Chugach Census Area
In Alaska’s record: 55th; strongest of 124,625 since 1900
Within 50 miles: 2; counties; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event iscgem908754 (“52 km NE of Chenega, 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

Chugach Census AreaAK · 3.3 mi
Kenai Peninsula BoroughAK · 43.5 mi

Earthquakes around the epicentre

419 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

January 31, 1912M6.7
February 23, 1925M6.6
February 15, 1916M6.4
September 21, 1911M6.3

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