M3.0 Earthquake 6 km SE of Maria Antonia, Puerto Rico — December 20, 2021
2021-12-20 23:06:20 UTC (2021-12-20) · approx. 7:06 PM UTC-4 local
On December 20, 2021 at 23:06 UTC, a magnitude 3.0 shallow crustal earthquake struck 6 km SE of Maria Antonia, Puerto Rico, at a depth of 13.0 km and coordinates 17.9448°, -66.8445°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 511 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 73 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8445°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.0 earthquake near Maria Antonia, Puerto Rico?
The magnitude 3.0 earthquake that struck 6 km SE of Maria Antonia, Puerto Rico on December 20, 2021 at 23:06 UTC had a depth of 13.0 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.
Actions
Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021354007). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 20, 2021). M3.0 Earthquake 6 km SE of Maria Antonia, Puerto Rico — December 20, 2021. Retrieved March 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/pr2021354007/