M5.3 Earthquake 143 km E of Kokopo, Papua New Guinea — November 17, 2021
2021-11-17 07:39:02 UTC (2021-11-17) · approx. 5:39 PM UTC+10 local
Felt by 2 people across nearby locations. Aftershock of the M5.5 mainshock.
On November 17, 2021 at 07:39 UTC, a magnitude 5.3 intermediate depth earthquake struck 143 km E of Kokopo, Papua New Guinea, at a depth of 88.1 km and coordinates -4.5664°, 153.5438°.
Physical scale: An earthquake of magnitude 5.3 releases seismic energy equivalent to roughly 1 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.7 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 5.5 mainshock that occurred 13 days ago 162 km E 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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 citizen responses 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
153.5438°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.3 earthquake near Kokopo, Papua New Guinea?
The magnitude 5.3 earthquake that struck 143 km E of Kokopo, Papua New Guinea on November 17, 2021 at 07:39 UTC had a depth of 88.1 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -4.5664°, 153.5438°, which is 143 km E 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 5.3 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 5.3 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 162 km E 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 5.3 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000fusj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 17, 2021). M5.3 Earthquake 143 km E of Kokopo, Papua New Guinea — November 17, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000fusj/