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The Japan News/Yomiuri
The Japan News/Yomiuri
National
The Yomiuri Shimbun

Unusual tide level changes delayed tsunami warnings after Tonga eruption

Tonga Japan Japan Meteorological Agency
(Credit: The Yomiuri Shimbun)

The Japan Meteorological Agency did not issue tsunami warnings until 11 hours after the volcanic eruption in Tonga, due to tide level changes that differed from what Japan is used to seeing with tsunami caused by an earthquake.

The tide level changes likely occurred as a result of a different mechanism, with experts pointing to shock waves caused by the underwater eruption as one possible reason for the unusual tidal shifts.

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