QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp00039p3
USGS usp00039p3
27 Oct 1987, 21:58
8 km SSE of Colonia Dora, Argentina
A magnitude 6.4 mw earthquake at 604.5 km depth.
Published location
Where is 8 km SSE of Colonia Dora, Argentina?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
-28.676000, -62.929000
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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
usp00039p3
Coordinates
-28.676, -62.929
Network
us
Significance
630