QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem886326
USGS iscgem886326
5 Apr 1957, 02:49
143 km E of Atka, Alaska
A magnitude 6.3 mw earthquake at 35 km depth.
Published location
Where is 143 km E of Atka, 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.
52.011000, -172.133000
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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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Catalog fields and provenance
Event ID
iscgem886326
Coordinates
52.011, -172.133
Network
iscgem
Significance
616