QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem889668
USGS iscgem889668
20 Jun 1955, 13:07
221 km WSW of Adak, Alaska
A magnitude 6.7 mw earthquake at 30.4 km depth.
Published location
Where is 221 km WSW 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.
51.511000, -179.788000
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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
iscgem889668
Coordinates
51.511, -179.788
Network
iscgem
Significance
689