QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/official19570309142233_30
USGS official19570309142233_30

9 Mar 1957, 14:22

1957 Atka, Alaska Earthquake

A magnitude 8.6 mw earthquake at 25 km depth.

Depth25 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated25 November 2025Latest timestamp stored in this record

Published location

Where is 1957 Atka, Alaska Earthquake?

This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.

51.499000, -175.626000

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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 8

1986 Atka, Alaska Earthquake

M 7.59

5 km WNW of Adak, Alaska

M 7.3

46 km SSW of Adak, Alaska

M 7.14

75 km S of Adak, Alaska

M 7.11

60 km SW of Adak, Alaska

M 7.11

58 km WNW of Atka, Alaska

Catalog fields and provenance
Event ID
official19570309142233_30
Coordinates
51.499, -175.626
Network
official
Significance
1138