QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem885978
USGS iscgem885978

21 Feb 1957, 14:30

167 km W of Nikolski, Alaska

A magnitude 6.9 mw earthquake at 104.1 km depth.

Depth104.1 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated26 April 2022Latest timestamp stored in this record

Published location

Where is 167 km W 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.

52.925000, -171.345000

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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 6.82

81 km ENE of Nikolski, Alaska

M 6.9

80 km E of Nikolski, Alaska

M 6.77

46 km SSW of Nikolski, Alaska

M 6.71

72 km ESE of Nikolski, Alaska

M 6.7

66 km W of Nikolski, Alaska

M 7.06

35 km SW of Nikolski, Alaska

Catalog fields and provenance
Event ID
iscgem885978
Coordinates
52.925, -171.345
Network
iscgem
Significance
722