M5.1 Earthquake 49 km ESE of Port-Olry, Vanuatu — April 10, 2023
2023-04-10 23:58:13 UTC (2023-04-10) · approx. 10:58 AM UTC+11 local
Aftershock of the M6.2 mainshock.
On April 10, 2023 at 23:58 UTC, a magnitude 5.1 intermediate depth earthquake struck 49 km ESE of Port-Olry, Vanuatu, at a depth of 128.5 km and coordinates -15.1759°, 167.5134°. This earthquake was detected by 102 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 400, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 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 6.2 mainshock that occurred 15 days ago 43 km ESE of Port-Olry, Vanuatu. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
The epicenter is located in Vanuatu, a region characterized by the New Hebrides subduction zone, where the Australian Plate subducts eastward at approximately 90 mm per year. View all earthquakes in Vanuatu.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
167.5134°E
Technical Information
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Common Questions
How strong was the magnitude 5.1 earthquake near Port-Olry, Vanuatu?
The magnitude 5.1 earthquake that struck 49 km ESE of Port-Olry, Vanuatu on April 10, 2023 at 23:58 UTC had a depth of 128.5 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -15.1759°, 167.5134°, which is 49 km ESE of Port-Olry, Vanuatu. View all earthquakes in Vanuatu.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M6.2 one earlier?
No. This magnitude 5.1 earthquake is an aftershock of the larger magnitude 6.2 mainshock that occurred earlier 43 km ESE of Port-Olry, Vanuatu. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has Vanuatu had earthquakes this big before?
The largest recorded earthquake in Vanuatu was the M7.9 Vanuatu earthquake of October 7, 2009. Today's magnitude 5.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000k3ds). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 10, 2023). M5.1 Earthquake 49 km ESE of Port-Olry, Vanuatu — April 10, 2023. Retrieved June 17, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k3ds/