M4.5 Earthquake 31 km N of Tasiilaq, Greenland — September 21, 2025
2025-09-21 15:54:58 UTC (2025-09-21) · approx. 12:54 PM UTC-3 local
On September 21, 2025 at 15:54 UTC, a magnitude 4.5 shallow crustal earthquake struck 31 km N of Tasiilaq, Greenland, at a depth of 10.0 km and coordinates 65.8944°, -37.5295°. This earthquake was detected by 47 seismic stations with good location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-37.5295°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake near Tasiilaq, Greenland?
The magnitude 4.5 earthquake that struck 31 km N of Tasiilaq, Greenland on September 21, 2025 at 15:54 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 65.8944°, -37.5295°, which is 31 km N of Tasiilaq, Greenland.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days 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: us7000qxpw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 21, 2025). M4.5 Earthquake 31 km N of Tasiilaq, Greenland — September 21, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000qxpw/