M3.1 Earthquake in the Puerto Rico region — July 4, 2020
2020-07-04 20:36:24 UTC (2020-07-04) · approx. 4:36 PM UTC-4 local
On July 4, 2020 at 20:36 UTC, a magnitude 3.1 shallow crustal earthquake struck in the Puerto Rico region, at a depth of 7.0 km and coordinates 17.9590°, -66.9840°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 587 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 78 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.9840°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake in the Puerto Rico region?
The magnitude 3.1 earthquake that struck in the Puerto Rico region on July 4, 2020 at 20:36 UTC had a depth of 7.0 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: pr2020186014). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 4, 2020). M3.1 Earthquake in the Puerto Rico region — July 4, 2020. Retrieved September 11, 2020 from https://www.earthquaketracker.org/earthquakes/event/pr2020186014/