Data last collected:
QuakeFactsEvidence report · prepared 23 October 2026https://quakes99.com/entity/usp00008uz
USGS usp00008uz
20 Nov 1974, 13:21
southwestern Atlantic Ocean
A magnitude 6 mb earthquake at 33 km depth.
Published location
Where is southwestern Atlantic Ocean?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
-53.566000, -28.345000
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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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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp00008uz
Coordinates
-53.566, -28.345
Network
us
Significance
554
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Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right southwestern Atlantic Ocean earthquake: magnitude 6 and depth | QuakeFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at southwestern Atlantic Ocean
Depth in another unit
The recorded event depth of 33 km is approximately 20.51 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for southwestern Atlantic Ocean is 53.566° south and 28.345° west. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.