QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00039e8
USGS usp00039e8
20 Oct 1987, 10:23
65 km WSW of Attu Station, Alaska
A magnitude 6 mw earthquake at 33 km depth.
Published location
Where is 65 km WSW of Attu Station, 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.
52.577000, 172.320000
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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
usp00039e8
Coordinates
52.577, 172.32
Network
us
Significance
554