QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/ak021gbh4rso
USGS ak021gbh4rso

21 Dec 2021, 22:42

58 km E of Port Alsworth, Alaska

A magnitude 5.9 mww earthquake at 151.2 km depth.

Depth151.2 kmPublished hypocentral depth
Tsunami flagFlaggedUSGS catalog flag, not a current warning
Updated22 December 2025Latest timestamp stored in this record

Published location

Where is 58 km E of Port Alsworth, 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.

60.123700, -153.274200

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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 5.9

Southern Alaska

M 6

Event 33 Novarupta-Mount Katmai area, Alaska Peninsula

M 6

Event 43 Novarupta-Mount Katmai area, Alaska Peninsula

M 6

69 km WNW of Skwentna, Alaska

M 5.8

63 km WSW of Nanwalek, Alaska

M 6.03

61 km WSW of Nanwalek, Alaska

Catalog fields and provenance
Event ID
ak021gbh4rso
Coordinates
60.1237, -153.2742
Network
ak
Significance
1096