QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgemsup886067
USGS iscgemsup886067
10 Mar 1957, 12:36
238 km SSW of Nikolski, Alaska
A magnitude 6 mw earthquake at 20 km depth.
Published location
Where is 238 km SSW of Nikolski, 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.
51.146000, -170.770000
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What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Catalog fields and provenance
Event ID
iscgemsup886067
Coordinates
51.146, -170.77
Network
iscgemsup
Significance
556