M4.7 Earthquake near eastern Greenland — September 21, 2023
2023-09-21 22:41:40 UTC (2023-09-21) · approx. 9:41 PM UTC-1 local
On September 21, 2023 at 22:41 UTC, a magnitude 4.7 shallow crustal earthquake struck near eastern Greenland, at a depth of 10.0 km and coordinates 79.5846°, -18.4638°. This earthquake was detected by 115 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-18.4638°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near eastern Greenland?
The magnitude 4.7 earthquake that struck near eastern Greenland on September 21, 2023 at 22:41 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 79.5846°, -18.4638°, which is near eastern Greenland.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000kx8y). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 21, 2023). M4.7 Earthquake near eastern Greenland — September 21, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kx8y/