M5.4 Earthquake near South Shetland Islands — October 28, 2020
2020-10-28 22:00:23 UTC (2020-10-28) · approx. 6:00 PM UTC-4 local
Maximum shaking intensity MMI 4.2 (moderate).
On October 28, 2020 at 22:00 UTC, a magnitude 5.4 shallow crustal earthquake struck near South Shetland Islands, at a depth of 10.0 km and coordinates -62.3222°, -58.1832°.
Physical scale: An earthquake of magnitude 5.4 releases seismic energy equivalent to roughly 2 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.2 km — a useful intuition for the size of the slip patch on the fault.
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
-58.1832°E
Technical Information
Common Questions
How strong was the magnitude 5.4 earthquake near South Shetland Islands?
The magnitude 5.4 earthquake that struck near South Shetland Islands on October 28, 2020 at 22:00 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -62.3222°, -58.1832°, which is near South Shetland Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.4 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000c79x). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 28, 2020). M5.4 Earthquake near South Shetland Islands — October 28, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000c79x/