M4.6 Earthquake 15 km WNW of Port-Olry, Vanuatu — March 20, 2026
2026-03-20 18:26:47 UTC (2026-03-20) · approx. 5:26 AM UTC+11 local
On March 20, 2026 at 18:26 UTC, a magnitude 4.6 shallow crustal earthquake struck 15 km WNW of Port-Olry, Vanuatu, at a depth of 43.2 km and coordinates -14.9811°, 166.9394°. This earthquake was detected by 37 seismic stations with good location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
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
166.9394°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake near Port-Olry, Vanuatu?
The magnitude 4.6 earthquake that struck 15 km WNW of Port-Olry, Vanuatu on March 20, 2026 at 18:26 UTC had a depth of 43.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -14.9811°, 166.9394°, which is 15 km WNW of Port-Olry, Vanuatu. View all earthquakes in Vanuatu.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
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 4.6 event is significantly smaller than that historical record.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us7000s8u0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, March 20, 2026). M4.6 Earthquake 15 km WNW of Port-Olry, Vanuatu — March 20, 2026. Retrieved May 13, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000s8u0/