M4.2 Earthquake 48 km NNW of San Antonio, Puerto Rico — August 30, 2026
2026-08-30 05:47:02 UTC (2 hours ago) · approx. 1:47 AM UTC-4 local
On August 30, 2026 at 05:47 UTC, a magnitude 4.2 shallow crustal earthquake struck 48 km NNW of San Antonio, Puerto Rico, at a depth of 35.0 km and coordinates 18.9034°, -67.2509°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.2509°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near San Antonio, Puerto Rico?
The magnitude 4.2 earthquake that struck 48 km NNW of San Antonio, Puerto Rico on August 30, 2026 at 05:47 UTC had a depth of 35.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000tcwu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 30, 2026). M4.2 Earthquake 48 km NNW of San Antonio, Puerto Rico — August 30, 2026. Retrieved August 30, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tcwu/