QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem886120
USGS iscgem886120
12 Mar 1957, 11:45
60 km SW of Adak, Alaska
A magnitude 7.1 mw earthquake at 20 km depth.
Published location
Where is 60 km SW of Adak, Alaska?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
51.481000, -177.243000
Open the interactive map ↗Map data © OpenStreetMap contributors
What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem886120
Coordinates
51.481, -177.243
Network
iscgem
Significance
778