QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004vbg
USGS usp0004vbg

14 Aug 1991, 13:53

163 km N of Nikolski, Alaska

A magnitude 6 mw earthquake at 274.8 km depth.

Depth274.8 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated28 April 2022Latest timestamp stored in this record

Published location

Where is 163 km N 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.

54.389000, -169.296000

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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

75 km SE of Nikolski, Alaska

M 6

62 km ESE of Nikolski, Alaska

M 6

93 km WNW of Dutch Harbor, Alaska

M 6

55 km NNW of Nikolski, Alaska

M 6

59 km WSW of Nikolski, Alaska

M 6.01

Fox Islands, Aleutian Islands, Alaska

Catalog fields and provenance
Event ID
usp0004vbg
Coordinates
54.389, -169.296
Network
us
Significance
554