QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem886700
USGS iscgem886700

13 Jun 1957, 11:40

100 km SW of Atka, Alaska

A magnitude 6.8 mw earthquake at 19.1 km depth.

Depth19.1 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated26 April 2022Latest timestamp stored in this record

Published location

Where is 100 km SW of Atka, 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.

51.534000, -175.201000

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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 6.78

99 km SW of Atka, Alaska

M 6.84

90 km SSW of Adak, Alaska

M 6.85

57 km SSW of Atka, Alaska

M 6.71

76 km SSE of Adak, Alaska

M 6.87

216 km SSE of Adak, Alaska

M 6.7

52 km ESE of Adak, Alaska

Catalog fields and provenance
Event ID
iscgem886700
Coordinates
51.534, -175.201
Network
iscgem
Significance
709