M3.0 Earthquake 6 km WSW of La Parguera, Puerto Rico — July 20, 2021
2021-07-20 21:35:43 UTC (2021-07-20) · approx. 5:35 PM UTC-4 local
On July 20, 2021 at 21:35 UTC, a magnitude 3.0 shallow crustal earthquake struck 6 km WSW of La Parguera, Puerto Rico, at a depth of 11.0 km and coordinates 17.9580°, -67.1053°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 567 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 77 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.1053°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near La Parguera, Puerto Rico?
The magnitude 3.0 earthquake that struck 6 km WSW of La Parguera, Puerto Rico on July 20, 2021 at 21:35 UTC had a depth of 11.0 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021201002). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 20, 2021). M3.0 Earthquake 6 km WSW of La Parguera, Puerto Rico — July 20, 2021. Retrieved July 20, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021201002/