QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem886583
USGS iscgem886583
22 May 1957, 14:29
198 km S of Adak, Alaska
A magnitude 6.1 mw earthquake at 15 km depth.
Published location
Where is 198 km S 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.
50.097000, -176.900000
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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
iscgem886583
Coordinates
50.097, -176.9
Network
iscgem
Significance
580