M3.4 Earthquake 59 km N of San Antonio, Puerto Rico — January 20, 2022
2022-01-20 18:21:55 UTC (2022-01-20) · approx. 2:21 PM UTC-4 local
On January 20, 2022 at 18:21 UTC, a magnitude 3.4 shallow crustal earthquake struck 59 km N of San Antonio, Puerto Rico, at a depth of 10.0 km and coordinates 19.0251°, -67.1846°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 125 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-67.1846°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near San Antonio, Puerto Rico?
The magnitude 3.4 earthquake that struck 59 km N of San Antonio, Puerto Rico on January 20, 2022 at 18:21 UTC had a depth of 10.0 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2022020002). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, January 20, 2022). M3.4 Earthquake 59 km N of San Antonio, Puerto Rico — January 20, 2022. Retrieved April 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/pr2022020002/