M3.5 Earthquake 114 km N of San Antonio, Puerto Rico — August 4, 2023
2023-08-04 22:17:40 UTC (2023-08-04) · approx. 6:17 PM UTC-4 local
On August 4, 2023 at 22:17 UTC, a magnitude 3.5 shallow crustal earthquake struck 114 km N of San Antonio, Puerto Rico, at a depth of 21.0 km and coordinates 19.5210°, -67.2053°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 3.0 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 164 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.2053°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near San Antonio, Puerto Rico?
The magnitude 3.5 earthquake that struck 114 km N of San Antonio, Puerto Rico on August 4, 2023 at 22:17 UTC had a depth of 21.0 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2023216000). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 4, 2023). M3.5 Earthquake 114 km N of San Antonio, Puerto Rico — August 4, 2023. Retrieved August 4, 2023 from https://www.earthquaketracker.org/earthquakes/event/pr2023216000/