Vanuatu earthquake prompts tsunami warnings before cancellation
- A shallow earthquake struck off the northern coast of Vanuatu on Saturday, prompting tsunami alerts before authorities cancelled the warnings based on observational data.
- Seismological agencies reported differing measurements in the immediate aftermath of the tremor.
- The Pacific Tsunami Warning Centre stated that hazardous tsunami waves were possible for coastlines within 300 kilometres of the epicentre, specifically targeting parts of Vanuatu.
A shallow earthquake struck off the northern coast of Vanuatu on Saturday, prompting tsunami alerts before authorities cancelled the warnings based on observational data. The tremor hit at 3:31 pm at a depth of 10 kilometres, according to reporting based on the United States Geological Survey. Geological monitors initially registered the tremor at a magnitude of 7.2 before revising it downward to 6.9, with the epicentre located roughly 200 kilometres north-west of Port Olry.
Magnitudes and Epicentres Across Geological Monitors
Seismological agencies reported differing measurements in the immediate aftermath of the tremor. The United States Geological Survey initially tracked the earthquake at magnitude 7.2 before settling on 6.9, with a shallow depth of 10 kilometres. RNZ reported that the epicentre sat approximately 200 kilometres north-west of Vanuatu’s Port Olry. The event also triggered a second, separate tremor nearby measuring magnitude 6.3, as recorded by geological monitors.
Warnings Issued and Cancelled for Coastal Vanuatu
The Pacific Tsunami Warning Centre stated that hazardous tsunami waves were possible for coastlines within 300 kilometres of the epicentre, specifically targeting parts of Vanuatu. The NZ Herald noted that the threat forecast applied strictly to Vanuatu, with authorities confirming no threat area was identified for New Zealand. By Saturday afternoon, the Vanuatu Geological Hazards Department cancelled the warning entirely. RNZ reported that the cancellation followed a review of the latest available sea level and observational data showing no ongoing tsunami threat to coastal areas.
Seismic Activity Along the Pacific Ring of Fire
Local authorities reported no immediate damage or casualties following the shallow earthquake. Earthquakes remain a common occurrence in Vanuatu due to its geography as a low-lying archipelago that straddles the tectonic Ring of Fire. That seismic arc stretches through Southeast Asia and across the entire Pacific basin, frequently subjecting island populations to shallow subduction-zone tremors.