M4.7 Earthquake 31 km WSW of Kandrian, Papua New Guinea — July 10, 2023
2023-07-10 13:49:50 UTC (2023-07-10) · approx. 11:49 PM UTC+10 local
Aftershock of the M5.1 mainshock.
On July 10, 2023 at 13:49 UTC, a magnitude 4.7 shallow crustal earthquake struck 31 km WSW of Kandrian, Papua New Guinea, at a depth of 43.7 km and coordinates -6.3477°, 149.3024°. This earthquake was detected by 58 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 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 28 km SW of Kandrian, 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
149.3024°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake near Kandrian, Papua New Guinea?
The magnitude 4.7 earthquake that struck 31 km WSW of Kandrian, Papua New Guinea on July 10, 2023 at 13:49 UTC had a depth of 43.7 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -6.3477°, 149.3024°, which is 31 km WSW of Kandrian, 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 4.7 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.7 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 28 km SW of Kandrian, 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 4.7 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000keld). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 10, 2023). M4.7 Earthquake 31 km WSW of Kandrian, Papua New Guinea — July 10, 2023. Retrieved September 16, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000keld/