M5.7 Earthquake in the South Sandwich Islands region — May 20, 2026
2026-05-20 23:00:58 UTC (1 hour ago) · approx. 9:00 PM UTC-2 local
On May 20, 2026 at 23:00 UTC, a magnitude 5.7 intermediate depth earthquake struck in the South Sandwich Islands region, at a depth of 112.1 km and coordinates -56.1130°, -28.0502°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 64 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 500, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.7 releases seismic energy equivalent to roughly 5 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 5.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in South Sandwich Islands, a region characterized by the South Sandwich Trench, one of Earth's most remote subduction zones.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-28.0502°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.7 earthquake in the South Sandwich Islands region?
The magnitude 5.7 earthquake that struck in the South Sandwich Islands region on May 20, 2026 at 23:00 UTC had a depth of 112.1 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -56.1130°, -28.0502°, which is in the South Sandwich Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.7 earthquakes can continue for days to weeks and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000sz3x). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 20, 2026). M5.7 Earthquake in the South Sandwich Islands region — May 20, 2026. Retrieved May 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000sz3x/