QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/us10008ef7
USGS us10008ef7
4 Apr 2017, 23:08
78 km SSE of Adak, Alaska
A magnitude 5.6 mww earthquake at 17 km depth.
Published location
Where is 78 km SSE 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.
51.186500, -176.377200
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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
us10008ef7
Coordinates
51.1865, -176.3772
Network
us
Significance
483