M3.4 Earthquake 1 km ENE of Brynmawr, United Kingdom — February 24, 2023
2023-02-24 23:59:40 UTC (2023-02-24) · approx. 11:59 PM UTC+0 local
Felt by 151 people across surrounding communities.
On February 24, 2023 at 23:59 UTC, a magnitude 3.4 shallow crustal earthquake struck 1 km ENE of Brynmawr, United Kingdom, at a depth of 10.2 km and coordinates 51.8053°, -3.1588°. This earthquake was detected by 16 seismic stations with good location accuracy and was assigned a USGS significance rating of 243, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 151 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-3.1588°E
Technical Information
Common Questions
How strong was the magnitude 3.4 earthquake near Brynmawr, United Kingdom?
The magnitude 3.4 earthquake that struck 1 km ENE of Brynmawr, United Kingdom on February 24, 2023 at 23:59 UTC had a depth of 10.2 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 51.8053°, -3.1588°, which is 1 km ENE of Brynmawr, United Kingdom.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000jrh6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, February 24, 2023). M3.4 Earthquake 1 km ENE of Brynmawr, United Kingdom — February 24, 2023. Retrieved March 13, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000jrh6/