QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/ushis2154
USGS ushis2154
11 Mar 1957, 03:35
136 km S of Adak, Alaska
A magnitude 6 ms earthquake at 33 km depth.
Published location
Where is 136 km S 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.
50.660000, -176.960000
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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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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
ushis2154
Coordinates
50.66, -176.96
Network
ushis
Significance
554