M4.4 Earthquake 129 km E of Madang, Papua New Guinea — March 20, 2023
2023-03-20 18:56:09 UTC (2023-03-20) · approx. 4:56 AM UTC+10 local
On March 20, 2023 at 18:56 UTC, a magnitude 4.4 intermediate depth earthquake struck 129 km E of Madang, Papua New Guinea, at a depth of 210.6 km and coordinates -5.4383°, 146.9319°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — 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 5.5 mainshock that occurred 16 days ago 116 km ESE of Madang, 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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
146.9319°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake near Madang, Papua New Guinea?
The magnitude 4.4 earthquake that struck 129 km E of Madang, Papua New Guinea on March 20, 2023 at 18:56 UTC had a depth of 210.6 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 4.4 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 4.4 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 116 km ESE of Madang, Papua New Guinea. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000jlhf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 20, 2023). M4.4 Earthquake 129 km E of Madang, Papua New Guinea — March 20, 2023. Retrieved May 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jlhf/