QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem902274
USGS iscgem902274
21 Dec 1939, 20:54
4 km WNW of Atenas, Costa Rica
A magnitude 7.6 mw earthquake at 25 km depth.
Published location
Where is 4 km WNW of Atenas, Costa Rica?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
9.990000, -84.412000
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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
iscgem902274
Coordinates
9.99, -84.412
Network
iscgem
Significance
886