The February 27, 1970 earthquake
M7.1near Atka, Alaska
A magnitude 7.1 earthquake 102.0 miles deep, 20.2 miles off Aleutians West Census Area. The 38th strongest in Alaska’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 7.1
- moment magnitude (mw)
- Depth
- 102.0 mi
- 164.1 km below the surface
- Local time
- Friday, February 27, 1970
- 23:52 BST; 10:52 UTC on Feb 28, 1970
- In Alaska’s record
- 38th
- strongest of 124,625 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem799531 (“58 km WNW 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 · 20.2 mi
Earthquakes around the epicentre
1,082 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.