QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem901242
USGS iscgem901242
16 Mar 1940, 21:40
118 km ESE of Chignik, Alaska
A magnitude 6.1 mw earthquake at 15 km depth.
Published location
Where is 118 km ESE of Chignik, 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.
55.930000, -156.608000
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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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Catalog fields and provenance
Event ID
iscgem901242
Coordinates
55.93, -156.608
Network
iscgem
Significance
578