M3.7 Earthquake 71 km NNE of Luquillo, Puerto Rico — May 28, 2023
2023-05-28 20:47:11 UTC (2023-05-28) · approx. 4:47 PM UTC-4 local
On May 28, 2023 at 20:47 UTC, a magnitude 3.7 shallow crustal earthquake struck 71 km NNE of Luquillo, Puerto Rico, at a depth of 21.0 km and coordinates 18.9578°, -65.4340°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.2 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 212 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-65.4340°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.7 earthquake near Luquillo, Puerto Rico?
The magnitude 3.7 earthquake that struck 71 km NNE of Luquillo, Puerto Rico on May 28, 2023 at 20:47 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2023148009). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, May 28, 2023). M3.7 Earthquake 71 km NNE of Luquillo, Puerto Rico — May 28, 2023. Retrieved August 5, 2023 from https://www.earthquaketracker.org/earthquakes/event/pr2023148009/