M3.2 Earthquake 1 km ENE of Lluveras, Puerto Rico — July 28, 2021
2021-07-28 19:36:05 UTC (2021-07-28) · approx. 3:36 PM UTC-4 local
On July 28, 2021 at 19:36 UTC, a magnitude 3.2 shallow crustal earthquake struck 1 km ENE of Lluveras, Puerto Rico, at a depth of 15.0 km and coordinates 18.0423°, -66.8876°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 919 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 96 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8876°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Lluveras, Puerto Rico?
The magnitude 3.2 earthquake that struck 1 km ENE of Lluveras, Puerto Rico on July 28, 2021 at 19:36 UTC had a depth of 15.0 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 3.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021209008). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 28, 2021). M3.2 Earthquake 1 km ENE of Lluveras, Puerto Rico — July 28, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021209008/