M3.9 Earthquake 174 km NE of Cruz Bay, U.S. Virgin Islands — June 13, 2021
2021-06-13 19:43:12 UTC (2021-06-13) · approx. 3:43 PM UTC-4 local
On June 13, 2021 at 19:43 UTC, a magnitude 3.9 shallow crustal earthquake struck 174 km NE of Cruz Bay, U.S. Virgin Islands, at a depth of 21.0 km and coordinates 19.6351°, -63.8545°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-63.8545°E
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Common Questions
How strong was the magnitude 3.9 earthquake near Cruz Bay, U.S. Virgin Islands?
The magnitude 3.9 earthquake that struck 174 km NE of Cruz Bay, U.S. Virgin Islands on June 13, 2021 at 19:43 UTC had a depth of 21.0 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021164006). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 13, 2021). M3.9 Earthquake 174 km NE of Cruz Bay, U.S. Virgin Islands — June 13, 2021. Retrieved August 26, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021164006/