M5.0 Earthquake 155 km SE of Kokopo, Papua New Guinea — April 29, 2023
2023-04-29 07:03:57 UTC (2023-04-29) · approx. 5:03 PM UTC+10 local
Aftershock of the M5.1 mainshock.
On April 29, 2023 at 07:03 UTC, a magnitude 5.0 shallow crustal earthquake struck 155 km SE of Kokopo, Papua New Guinea, at a depth of 65.7 km and coordinates -5.1828°, 153.3941°. This earthquake was detected by 87 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 385, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.0 releases seismic energy equivalent to roughly 477 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.7 km — 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 5.1 mainshock that occurred 10 days ago 183 km SE of Kokopo, 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.
The epicenter is located in Papua New Guinea, a region characterized by the collision and subduction of the Pacific, Australian, and Solomon Sea plates. View all earthquakes in Papua New Guinea.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
153.3941°E
Technical Information
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Common Questions
How strong was the magnitude 5.0 earthquake near Kokopo, Papua New Guinea?
The magnitude 5.0 earthquake that struck 155 km SE of Kokopo, Papua New Guinea on April 29, 2023 at 07:03 UTC had a depth of 65.7 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -5.1828°, 153.3941°, which is 155 km SE of Kokopo, Papua New Guinea. View all earthquakes in Papua New Guinea.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.0 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 5.0 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 183 km SE of Kokopo, Papua New Guinea. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has Papua New Guinea had earthquakes this big before?
The largest recorded earthquake in Papua New Guinea was the M8.0 New Britain earthquake of July 18, 1971. Today's magnitude 5.0 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000jwwp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 29, 2023). M5.0 Earthquake 155 km SE of Kokopo, Papua New Guinea — April 29, 2023. Retrieved July 11, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jwwp/