QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/us1000gb5u
USGS us1000gb5u
17 Aug 2018, 05:35
123 km WSW of Adak, Alaska
A magnitude 5.4 mww earthquake at 31.8 km depth.
Published location
Where is 123 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.
51.297200, -178.153600
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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
us1000gb5u
Coordinates
51.2972, -178.1536
Network
us
Significance
449