M4.4 Earthquake southeast of the Loyalty Islands — June 21, 2026
2026-06-21 18:18:19 UTC (2026-06-21) · approx. 5:18 AM UTC+11 local
On June 21, 2026 at 18:18 UTC, a magnitude 4.4 shallow crustal earthquake struck southeast of the Loyalty Islands, at a depth of 10.0 km and coordinates -22.9991°, 171.4797°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 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 5.0 mainshock that occurred 12 days ago southeast of the Loyalty Islands. Since the mainshock, the USGS has recorded 10 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
171.4797°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.4 earthquake southeast of the Loyalty Islands?
The magnitude 4.4 earthquake that struck southeast of the Loyalty Islands on June 21, 2026 at 18:18 UTC had a depth of 10.0 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 4.4 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.4 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier southeast of the Loyalty Islands. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000t8h8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, June 21, 2026). M4.4 Earthquake southeast of the Loyalty Islands — June 21, 2026. Retrieved June 27, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000t8h8/