4.9

M4.9 Earthquake north of Ascension Island — November 23, 2025

2025-11-23 12:25:06 UTC (2025-11-23) · approx. 11:25 AM UTC-1 local

MagnitudeM4.9(mb)
Time12:25 UTC≈ 11:25 AM UTC-1
Depth10.0 kmshallow crustal
Coordinates-1.019°, -13.411°
Felt byNo felt reports
Status✓ Reviewed by USGS

On November 23, 2025 at 12:25 UTC, a magnitude 4.9 shallow crustal earthquake struck north of Ascension Island, at a depth of 10.0 km and coordinates -1.0187°, -13.4111°. This earthquake was detected by 42 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.

Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.

Map showing earthquake epicenter at -1.02°, -13.41°

Earthquake Details

Magnitude
4.9 mb
Depth
10.0 km
shallow crustal
Location
-1.0187°N
-13.4111°E

Technical Information

Event ID
us6000ru5u
Event Type
earthquake
Status
✓ Reviewed
Significance
369
Stations Used
42
Azimuthal Gap
75.0°
Min Station Distance
44.573°
RMS Residual
0.47 sec
Last Updated
2026-02-20 16:07:38 UTC

Common Questions

How strong was the magnitude 4.9 earthquake north of Ascension Island?

The magnitude 4.9 earthquake that struck north of Ascension Island on November 23, 2025 at 12:25 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 -1.0187°, -13.4111°, which is north of Ascension Island.

Were there aftershocks?

Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 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.

Actions

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Authoritative source: USGS event page (event ID: us6000ru5u). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2025, November 23, 2025). M4.9 Earthquake north of Ascension Island — November 23, 2025. Retrieved May 25, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000ru5u/