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USGS iscgem798211

20 Mar 1970, 00:33

169 km S of Attu Station, Alaska

A magnitude 6.3 mw earthquake at 17.7 km depth.

Depth17.7 kmPublished hypocentral depth

Tsunami flagNot flaggedUSGS catalog flag, not a current warning

Updated19 December 2025Latest timestamp stored in this record

Published location

Where is 169 km S of Attu Station, 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.

51.355000, 173.660000

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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

177 km S of Attu Station, Alaska

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239 km SE of Attu Station, Alaska

251 km SE of Attu Station, Alaska

Catalog fields and provenance

Event ID

iscgem798211

Coordinates

51.355, 173.66

Network

iscgem

Significance

613