M4.1 Earthquake 92 km NW of Madang, Papua New Guinea — October 21, 2023
2023-10-21 17:16:08 UTC (2023-10-21) · approx. 3:16 AM UTC+10 local
On October 21, 2023 at 17:16 UTC, a magnitude 4.1 intermediate depth earthquake struck 92 km NW of Madang, Papua New Guinea, at a depth of 194.6 km and coordinates -4.7011°, 145.1327°.
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
145.1327°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Madang, Papua New Guinea?
The magnitude 4.1 earthquake that struck 92 km NW of Madang, Papua New Guinea on October 21, 2023 at 17:16 UTC had a depth of 194.6 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 4.1 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: us7000l69t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 21, 2023). M4.1 Earthquake 92 km NW of Madang, Papua New Guinea — October 21, 2023. Retrieved December 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000l69t/