M3.4 Earthquake 56 km NNW of San Antonio, Puerto Rico — September 12, 2024
2024-09-12 21:57:56 UTC (2024-09-12) · approx. 5:57 PM UTC-4 local
On September 12, 2024 at 21:57 UTC, a magnitude 3.4 shallow crustal earthquake struck 56 km NNW of San Antonio, Puerto Rico, at a depth of 20.7 km and coordinates 18.9312°, -67.3798°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 123 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.3798°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near San Antonio, Puerto Rico?
The magnitude 3.4 earthquake that struck 56 km NNW of San Antonio, Puerto Rico on September 12, 2024 at 21:57 UTC had a depth of 20.7 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr71459873). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, September 12, 2024). M3.4 Earthquake 56 km NNW of San Antonio, Puerto Rico — September 12, 2024. Retrieved September 12, 2024 from https://www.earthquaketracker.org/earthquakes/event/pr71459873/