The May 4, 1923 earthquake

M7.0near Chignik, Alaska

A magnitude 7.0 earthquake 15.5 miles deep, 11.2 miles off Kodiak Island Borough. 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: 15.5 mi; 25.0 km below the surface
Local time: Friday, May 4, 1923; 06:26 AST; 16:26 UTC
Epicentre: 55.84°N, 156.77°W; 11.2 mi from Kodiak Island Borough
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 iscgem911354 (“113 km ESE of Chignik, 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

Kodiak Island BoroughAK · 11.2 mi
Lake and Peninsula BoroughAK · 48.8 mi

Earthquakes around the epicentre

503 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

September 12, 1911M6.1

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