2025-10-11 13:08:00 (M5.5) South Sandwich Islands region -56.4 -26.6 (70fa9)

M5.5 Earthquake - South Sandwich Islands region

Preliminary Report

Magnitude	5.5
Date-Time	Universal Time (UTC): 11 Oct 2025 13:08:00 Time near the Epicenter (1): 11 Oct 2025 11:08:00 Time in your area (1): 11 Oct 2025 18:38:00
Location	56.377S 26.557W
Depth	54 km
Distances	2396.0 km (1485.5 mi) SSW of Edinburgh of the Seven Seas, Saint Helena 2597.8 km (1610.6 mi) ENE of Ushuaia, Argentina 2604.1 km (1614.5 mi) E of Río Grande, Argentina 2799.7 km (1735.8 mi) E of Río Gallegos, Argentina 2817.6 km (1746.9 mi) E of Puerto Deseado, Argentina
Location Uncertainty	Horizontal: 11.3 km; Vertical 8.5 km
Parameters	Nph = 46; Dmin = 672.1 km; Rmss = 0.88 seconds; Gp = 81° Version =
Event ID	us 6000rgk9

(1) Nominal Standard Time; local and daylight savings time zone may differ.
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
National Earthquake Information Center
U.S. Geological Survey


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