QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00034ry
USGS usp00034ry
6 May 1987, 05:06
235 km WSW of Adak, Alaska
A magnitude 6.8 mw earthquake at 20.1 km depth.
Published location
Where is 235 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.
51.272000, -179.898000
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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
usp00034ry
Coordinates
51.272, -179.898
Network
us
Significance
711