M3.3 Earthquake 4 km ESE of Maria Antonia, Puerto Rico — October 16, 2020
2020-10-16 18:34:14 UTC (2020-10-16) · approx. 2:34 PM UTC-4 local
On October 16, 2020 at 18:34 UTC, a magnitude 3.3 shallow crustal earthquake struck 4 km ESE of Maria Antonia, Puerto Rico, at a depth of 17.0 km and coordinates 17.9636°, -66.8513°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-66.8513°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Maria Antonia, Puerto Rico?
The magnitude 3.3 earthquake that struck 4 km ESE of Maria Antonia, Puerto Rico on October 16, 2020 at 18:34 UTC had a depth of 17.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2020290011). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 16, 2020). M3.3 Earthquake 4 km ESE of Maria Antonia, Puerto Rico — October 16, 2020. Retrieved December 29, 2020 from https://www.earthquaketracker.org/earthquakes/event/pr2020290011/