M4.0 Earthquake 55 km S of Isangel, Vanuatu — May 22, 2026
2026-05-22 17:07:03 UTC (2026-05-22) · approx. 4:07 AM UTC+11 local
On May 22, 2026 at 17:07 UTC, a magnitude 4.0 intermediate depth earthquake struck 55 km S of Isangel, Vanuatu, at a depth of 125.6 km and coordinates -20.0397°, 169.3752°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 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 5.4 mainshock that occurred 17 days ago 81 km SSE of Isangel, Vanuatu. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
169.3752°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Isangel, Vanuatu?
The magnitude 4.0 earthquake that struck 55 km S of Isangel, Vanuatu on May 22, 2026 at 17:07 UTC had a depth of 125.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.4 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.4 mainshock that occurred earlier 81 km SSE of Isangel, Vanuatu. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000spaf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 22, 2026). M4.0 Earthquake 55 km S of Isangel, Vanuatu — May 22, 2026. Retrieved August 5, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000spaf/