QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0000rp2
USGS usp0000rp2
23 Nov 1977, 09:34
77 km SE of San Agustín de Valle Fértil, Argentina
A magnitude 6 mb earthquake at 33 km depth.
Published location
Where is 77 km SE of San Agustín de Valle Fértil, 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.
-31.178000, -66.957000
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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
usp0000rp2
Coordinates
-31.178, -66.957
Network
us
Significance
554