QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0003a6c
USGS usp0003a6c
17 Nov 1987, 08:46
Gulf of Alaska
A magnitude 6.9 ms earthquake at 10 km depth.
Published location
Where is Gulf of 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.
58.586000, -143.270000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0003a6c
Coordinates
58.586, -143.27
Network
us
Significance
732