| Magnitude | 5.4 |
| Alert | Strong |
| Depth | 33.0 km |
| Coordinates | -55.713, -25.631 |
| UTC time | 1977-04-23 18:43:54.500 |
Earthquake details
Saturday, April 23, 1977 Earthquake
The earthquake hit South Sandwich Islands region on Saturday, April 23, 1977 at 18:43 UTC with a magnitude of 5.4. The closest known location in the current dataset is Ushuaia, about 2666.5 km away. The epicenter is located at longitude -25.631 and latitude -55.713.
| Location | South Sandwich Islands region |
| Country | South Sandwich Islands region |
| Severity | Strong |
Earthquake map 1977-04-23
Closest countries
The 12 closest cities near the epicenter.
| Ushuaia | 2666.5 km |
| Río Grande | 2670.1 km |
| Río Gallegos | 2861.5 km |
| Punta Arenas | 2892.9 km |
| Caleta Olivia | 3051.1 km |
| Mar del Plata | 3082.8 km |
| Comodoro Rivadavia | 3087.3 km |
| Necochea | 3103.1 km |
| Trelew | 3130.7 km |
| Balcarce | 3135.4 km |
| Puerto Madryn | 3149.1 km |
| Viedma | 3171.7 km |
Nearby earthquakes
The latest 8 earthquakes within 100 km of this epicenter.
M 4.9
South Sandwich Islands region
Unknown · 2026-09-12 11:05 UTC
95.6 km
M 5.0
South Sandwich Islands region
Unknown · 2026-09-04 06:45 UTC
59.2 km
M 4.6
South Sandwich Islands region
Unknown · 2026-07-12 15:15 UTC
79.8 km
M 4.9
South Sandwich Islands region
Unknown · 2026-06-30 15:15 UTC
98.6 km
M 4.6
South Sandwich Islands region
Unknown · 2026-06-30 01:33 UTC
92.0 km
M 4.7
South Sandwich Islands region
Unknown · 2026-06-28 22:14 UTC
57.1 km
M 4.6
South Sandwich Islands region
Unknown · 2026-06-22 12:45 UTC
99.3 km
M 4.6
South Sandwich Islands region
Unknown · 2026-06-19 03:50 UTC
67.4 km
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