M4.2 Earthquake 48 km SW of Ialibu, Papua New Guinea — January 26, 2026
2026-01-26 17:57:17 UTC (2026-01-26) · approx. 3:57 AM UTC+10 local
On January 26, 2026 at 17:57 UTC, a magnitude 4.2 shallow crustal earthquake struck 48 km SW of Ialibu, Papua New Guinea, at a depth of 10.0 km and coordinates -6.6303°, 143.7310°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 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 5.2 mainshock that occurred 17 days ago 31 km SSW of Ialibu, Papua New Guinea. 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
143.7310°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Ialibu, Papua New Guinea?
The magnitude 4.2 earthquake that struck 48 km SW of Ialibu, Papua New Guinea on January 26, 2026 at 17:57 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 4.2 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.2 one earlier?
No. This magnitude 4.2 earthquake is an aftershock of the larger magnitude 5.2 mainshock that occurred earlier 31 km SSW of Ialibu, Papua New Guinea. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000s831). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, January 26, 2026). M4.2 Earthquake 48 km SW of Ialibu, Papua New Guinea — January 26, 2026. Retrieved April 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000s831/