QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem909201
USGS iscgem909201
16 Apr 1927, 09:15
144 km SW of Adak, Alaska
A magnitude 6.5 mw earthquake at 20 km depth.
Published location
Where is 144 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.
51.086000, -178.282000
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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
iscgem909201
Coordinates
51.086, -178.282
Network
iscgem
Significance
640