M3.9 Earthquake 92 km NW of Mantua, Cuba — June 8, 2026
2026-06-08 22:31:57 UTC (2026-06-08) · approx. 4:31 PM UTC-6 local
On June 8, 2026 at 22:31 UTC, a magnitude 3.9 shallow crustal earthquake struck 92 km NW of Mantua, Cuba, at a depth of 10.0 km and coordinates 22.8041°, -84.9911°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 6.1 mainshock that occurred 17 days ago 106 km WNW of Mantua, Cuba. Since the mainshock, the USGS has recorded 4 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
Earthquake Details
-84.9911°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Mantua, Cuba?
The magnitude 3.9 earthquake that struck 92 km NW of Mantua, Cuba on June 8, 2026 at 22:31 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 3.9 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M6.1 one earlier?
No. This magnitude 3.9 earthquake is an aftershock of the larger magnitude 6.1 mainshock that occurred earlier 106 km WNW of Mantua, Cuba. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000srmf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, June 8, 2026). M3.9 Earthquake 92 km NW of Mantua, Cuba — June 8, 2026. Retrieved June 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000srmf/