QQuakeFacts
USGS iscgem869910

28 Mar 1964, 13:20

67 km S of Akhiok, Alaska

A magnitude 6.5 mw earthquake at 20.9 km depth.

Depth20.9 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated19 December 2025Latest timestamp stored in this record

Published location

Where is 67 km S of Akhiok, 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.

56.336000, -154.155000

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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
iscgem869910
Coordinates
56.336, -154.155
Network
iscgem
Significance
658