QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem887163
USGS iscgem887163
7 Sept 1957, 11:06
156 km WSW of Adak, Alaska
A magnitude 6.1 mw earthquake at 25 km depth.
Published location
Where is 156 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.
51.288000, -178.681000
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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
iscgem887163
Coordinates
51.288, -178.681
Network
iscgem
Significance
578