M4.4 Earthquake 44 km NE of Port-Olry, Vanuatu — August 25, 2023
2023-08-25 22:33:08 UTC (2023-08-25) · approx. 9:33 AM UTC+11 local
On August 25, 2023 at 22:33 UTC, a magnitude 4.4 intermediate depth earthquake struck 44 km NE of Port-Olry, Vanuatu, at a depth of 140.0 km and coordinates -14.7471°, 167.3582°.
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 6.1 mainshock that occurred 10 days ago 56 km NNE of Port-Olry, Vanuatu. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
Earthquake Details
167.3582°E
Technical Information
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Common Questions
How strong was the magnitude 4.4 earthquake near Port-Olry, Vanuatu?
The magnitude 4.4 earthquake that struck 44 km NE of Port-Olry, Vanuatu on August 25, 2023 at 22:33 UTC had a depth of 140.0 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 M6.1 one earlier?
No. This magnitude 4.4 earthquake is an aftershock of the larger magnitude 6.1 mainshock that occurred earlier 56 km NNE of Port-Olry, Vanuatu. 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: us7000kse6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 25, 2023). M4.4 Earthquake 44 km NE of Port-Olry, Vanuatu — August 25, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kse6/