QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004p45
USGS usp0004p45
16 Mar 1991, 06:02
15 km N of Nandayure, Costa Rica
A magnitude 6.3 mw earthquake at 33.3 km depth.
Published location
Where is 15 km N of Nandayure, 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.
10.174000, -85.184000
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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
usp0004p45
Coordinates
10.174, -85.184
Network
us
Significance
611