M4.3 Earthquake 186 km ESE of Kokopo, Papua New Guinea — October 21, 2021
2021-10-21 20:31:53 UTC (2021-10-21) · approx. 6:31 AM UTC+10 local
On October 21, 2021 at 20:31 UTC, a magnitude 4.3 intermediate depth earthquake struck 186 km ESE of Kokopo, Papua New Guinea, at a depth of 70.6 km and coordinates -5.0531°, 153.7952°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
153.7952°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Kokopo, Papua New Guinea?
The magnitude 4.3 earthquake that struck 186 km ESE of Kokopo, Papua New Guinea on October 21, 2021 at 20:31 UTC had a depth of 70.6 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000fp8f). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 21, 2021). M4.3 Earthquake 186 km ESE of Kokopo, Papua New Guinea — October 21, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fp8f/