QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem875823
USGS iscgem875823

21 Dec 1962, 08:42

79 km SSE of Nikolski, Alaska

A magnitude 6.4 mw earthquake at 20.6 km depth.

Depth20.6 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated26 April 2022Latest timestamp stored in this record

Published location

Where is 79 km SSE of Nikolski, 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.

52.256000, -168.532000

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Map data © OpenStreetMap contributors

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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Nearby events with a similar magnitude

M 6.36

71 km SE of Nikolski, Alaska

M 6.45

69 km S of Nikolski, Alaska

M 6.45

143 km ESE of Atka, Alaska

M 6.47

85 km SSE of Nikolski, Alaska

M 6.33

143 km E of Atka, Alaska

M 6.32

110 km SE of Nikolski, Alaska

Catalog fields and provenance
Event ID
iscgem875823
Coordinates
52.256, -168.532
Network
iscgem
Significance
630