M3.7 Earthquake 70 km NNE of Cruz Bay, U.S. Virgin Islands — September 19, 2021
2021-09-19 21:37:50 UTC (2021-09-19) · approx. 5:37 PM UTC-4 local
On September 19, 2021 at 21:37 UTC, a magnitude 3.7 shallow crustal earthquake struck 70 km NNE of Cruz Bay, U.S. Virgin Islands, at a depth of 23.0 km and coordinates 18.8658°, -64.4285°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 226 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-64.4285°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Cruz Bay, U.S. Virgin Islands?
The magnitude 3.7 earthquake that struck 70 km NNE of Cruz Bay, U.S. Virgin Islands on September 19, 2021 at 21:37 UTC had a depth of 23.0 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2021262009). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 19, 2021). M3.7 Earthquake 70 km NNE of Cruz Bay, U.S. Virgin Islands — September 19, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2021262009/