The March 9, 1957 earthquake
M6.6near Atka, Alaska
A magnitude 6.6 earthquake 20.5 miles deep, 43.6 miles off Aleutians West Census Area. The 151st strongest in Alaska’s record since 1900, and the strongest within 50 miles since a magnitude 6.6 on March 9, 1957.
The earthquake
- Magnitude
- 6.6
- as reported (uk)
- Depth
- 20.5 mi
- 33.0 km below the surface
- Local time
- Saturday, March 9, 1957
- 16:09 NST; 03:09 UTC on Mar 10, 1957
- In Alaska’s record
- 151st
- strongest of 124,625 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ushis2141 (“89 km S 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 · 43.6 mi
Earthquakes around the epicentre
2,268 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
- October 13, 1926M6.9
- November 1, 1946M6.8
- March 9, 1957M6.6
- August 8, 1926M6.3
- November 5, 1934M6.3
- July 19, 1933M6.1
- July 19, 1933M6.1
- July 18, 1933M6.0
- July 18, 1933M5.9
- July 18, 1933M5.9
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.