QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000fa6u
USGS usp000fa6u

20 Apr 2007, 18:20

94 km NNE of Adak, Alaska

A magnitude 5.4 mwc earthquake at 177.1 km depth.

Depth177.1 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated22 December 2025Latest timestamp stored in this record

Published location

Where is 94 km NNE of Adak, 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.

52.654000, -176.104000

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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 5.4

50 km NW of Atka, Alaska

M 5.5

78 km NE of Atka, Alaska

M 5.5

104 km N of Atka, Alaska

M 5.5

123 km NNE of Atka, Alaska

M 5.2

100 km NNW of Atka, Alaska

M 5.2

85 km NNW of Adak, Alaska

Catalog fields and provenance
Event ID
usp000fa6u
Coordinates
52.654, -176.104
Network
us
Significance
449