M4.1 Earthquake 79 km SE of Kieta, Papua New Guinea — June 28, 2025
2025-06-28 19:40:55 UTC (2025-06-28) · approx. 5:40 AM UTC+10 local
On June 28, 2025 at 19:40 UTC, a magnitude 4.1 intermediate depth earthquake struck 79 km SE of Kieta, Papua New Guinea, at a depth of 130.7 km and coordinates -6.7896°, 156.0666°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
156.0666°E
Technical Information
Common Questions
How strong was the magnitude 4.1 earthquake near Kieta, Papua New Guinea?
The magnitude 4.1 earthquake that struck 79 km SE of Kieta, Papua New Guinea on June 28, 2025 at 19:40 UTC had a depth of 130.7 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000qbll). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 28, 2025). M4.1 Earthquake 79 km SE of Kieta, Papua New Guinea — June 28, 2025. Retrieved September 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qbll/