M3.8 Earthquake 34 km SSW of Boca de Yuma, Dominican Republic — September 21, 2025
2025-09-21 23:18:23 UTC (2025-09-21) · approx. 6:18 PM UTC-5 local
On September 21, 2025 at 23:18 UTC, a magnitude 3.8 intermediate depth earthquake struck 34 km SSW of Boca de Yuma, Dominican Republic, at a depth of 122.0 km and coordinates 18.0750°, -68.6990°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 256 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 21 days ago 51 km S of Boca de Yuma, Dominican Republic. Since the mainshock, the USGS has recorded 3 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-68.6990°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.8 earthquake near Boca de Yuma, Dominican Republic?
The magnitude 3.8 earthquake that struck 34 km SSW of Boca de Yuma, Dominican Republic on September 21, 2025 at 23:18 UTC had a depth of 122.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.8 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 3.8 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 51 km S of Boca de Yuma, Dominican Republic. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2025264007). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 21, 2025). M3.8 Earthquake 34 km SSW of Boca de Yuma, Dominican Republic — September 21, 2025. Retrieved December 6, 2025 from https://www.earthquaketracker.org/earthquakes/event/pr2025264007/