M5.6 Earthquake in the Balleny Islands region — February 21, 2026
2026-02-21 17:01:49 UTC (2026-02-21) · approx. 4:01 AM UTC+11 local
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On February 21, 2026 at 17:01 UTC, a magnitude 5.6 shallow crustal earthquake struck in the Balleny Islands region, at a depth of 10.0 km and coordinates -63.1367°, 169.5433°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 124 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 482, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.6 releases seismic energy equivalent to roughly 4 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 4.4 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
169.5433°E
Technical Information
Common Questions
How strong was the magnitude 5.6 earthquake in the Balleny Islands region?
The magnitude 5.6 earthquake that struck in the Balleny Islands region on February 21, 2026 at 17:01 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 -63.1367°, 169.5433°, which is in the Balleny Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.6 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: us6000samt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, February 21, 2026). M5.6 Earthquake in the Balleny Islands region — February 21, 2026. Retrieved May 18, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000samt/