M3.5 Earthquake 81 km NNE of Cruz Bay, U.S. Virgin Islands — February 21, 2021
2021-02-21 23:56:29 UTC (2021-02-21) · approx. 7:56 PM UTC-4 local
On February 21, 2021 at 23:56 UTC, a magnitude 3.5 shallow crustal earthquake struck 81 km NNE of Cruz Bay, U.S. Virgin Islands, at a depth of 33.0 km and coordinates 18.9926°, -64.4448°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 3.2 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 170 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-64.4448°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Cruz Bay, U.S. Virgin Islands?
The magnitude 3.5 earthquake that struck 81 km NNE of Cruz Bay, U.S. Virgin Islands on February 21, 2021 at 23:56 UTC had a depth of 33.0 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021052011). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 21, 2021). M3.5 Earthquake 81 km NNE of Cruz Bay, U.S. Virgin Islands — February 21, 2021. Retrieved May 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021052011/