M4.6 Earthquake north of Ascension Island — April 21, 2025
2025-04-21 07:36:56 UTC (2025-04-21) · approx. 6:36 AM UTC-1 local
On April 21, 2025 at 07:36 UTC, a magnitude 4.6 shallow crustal earthquake struck north of Ascension Island, at a depth of 10.0 km and coordinates -1.4508°, -15.9592°. This earthquake was detected by 30 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-15.9592°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake north of Ascension Island?
The magnitude 4.6 earthquake that struck north of Ascension Island on April 21, 2025 at 07:36 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 -1.4508°, -15.9592°, which is north of Ascension Island.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000pxr8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 21, 2025). M4.6 Earthquake north of Ascension Island — April 21, 2025. Retrieved June 27, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000pxr8/