The April 10, 1957 earthquake

M6.7near Akhiok, Alaska

A magnitude 6.7 earthquake 9.3 miles deep, 43.5 miles off Kodiak Island Borough. The 120th strongest in Alaska’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.

The earthquake

Magnitude: 6.7; moment magnitude (mw)
Depth: 9.3 mi; 15.0 km below the surface
Local time: Wednesday, April 10, 1957; 01:30 AST; 11:30 UTC
Epicentre: 55.87°N, 153.96°W; 43.5 mi from Kodiak Island Borough
In Alaska’s record: 120th; strongest of 124,625 since 1900
Within 50 miles: 1; county; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event iscgem886362 (“120 km S of Akhiok, 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 · 43.5 mi

Earthquakes around the epicentre

368 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

June 15, 1953M6.5
November 29, 1952M6.5
December 28, 1917M6.4
July 27, 1955M6.3
May 8, 1939M6.2
November 10, 1944M6.2
April 1, 1941M6.2
June 27, 1948M6.0
June 16, 1954M6.0
May 25, 1948M6.0

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