M3.1 Earthquake 15 km SSE of Maria Antonia, Puerto Rico — September 30, 2021
2021-09-30 16:13:18 UTC (2021-09-30) · approx. 12:13 PM UTC-4 local
On September 30, 2021 at 16:13 UTC, a magnitude 3.1 shallow crustal earthquake struck 15 km SSE of Maria Antonia, Puerto Rico, at a depth of 10.0 km and coordinates 17.8458°, -66.8375°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 697 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 84 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8375°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Maria Antonia, Puerto Rico?
The magnitude 3.1 earthquake that struck 15 km SSE of Maria Antonia, Puerto Rico on September 30, 2021 at 16:13 UTC had a depth of 10.0 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021273001). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 30, 2021). M3.1 Earthquake 15 km SSE of Maria Antonia, Puerto Rico — September 30, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021273001/