QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0000qbd
USGS usp0000qbd
26 Aug 1977, 20:50
east of the South Sandwich Islands
A magnitude 7.1 ms earthquake at 33 km depth.
Published location
Where is east of the South Sandwich Islands?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
-59.426000, -20.508000
Open the interactive map ↗Map data © OpenStreetMap contributors
What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0000qbd
Coordinates
-59.426, -20.508
Network
us
Significance
776