QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/us10004x4s
USGS us10004x4s
13 Mar 2016, 03:20
81 km S of Atka, Alaska
A magnitude 5 mb earthquake at 10 km depth.
Published location
Where is 81 km S 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.
51.477900, -173.978400
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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
us10004x4s
Coordinates
51.4779, -173.9784
Network
us
Significance
385