QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/official19460401122901_30
USGS official19460401122901_30

1 Apr 1946, 12:29

The 1946 Unimak Island, Alaska Earthquake

A magnitude 8.6 mw earthquake at 15 km depth.

Depth15 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated30 July 2026Latest timestamp stored in this record

Published location

Where is The 1946 Unimak Island, 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.

53.492000, -162.832000

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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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Continue exploring

Nearby events with a similar magnitude

M 7.07

39 km S of Akutan, Alaska

M 6.9

67 km SW of Unalaska, Alaska

M 6.84

68 km SSW of Unalaska, Alaska

M 6.6

92 km SE of Akutan, Alaska

M 6.58

146 km ESE of Akutan, Alaska

M 6.55

83 km SE of Akutan, Alaska

Catalog fields and provenance
Event ID
official19460401122901_30
Coordinates
53.492, -162.832
Network
official
Significance
1138