QQuakeFacts
QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgemsup913789
USGS iscgemsup913789

18 Apr 1916, 04:01

133 km WNW of Nikolski, Alaska

A magnitude 7.4 mB earthquake at 140 km depth.

Depth140 kmPublished hypocentral depth
Tsunami flagNot flaggedUSGS catalog flag, not a current warning
Updated20 April 2026Latest timestamp stored in this record

Published location

Where is 133 km WNW of Nikolski, 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.

53.442000, -170.668000

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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 7.06

35 km SW of Nikolski, Alaska

M 7.8

81 km E of Nikolski, Alaska

M 6.9

80 km E of Nikolski, Alaska

M 6.85

167 km W of Nikolski, Alaska

M 6.82

81 km ENE of Nikolski, Alaska

M 6.77

46 km SSW of Nikolski, Alaska

Catalog fields and provenance
Event ID
iscgemsup913789
Coordinates
53.442, -170.668
Network
iscgemsup
Significance
842