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Scientists: Shock waves of air logged across Japan
A Japanese research team says shock waves running through the air were observed across Japan about seven hours after Saturday's volcanic eruption off Tonga.
The team at Kochi University of Technology has observation equipment at 25 locations across Japan. The devices are designed to detect shock waves in frequencies too low to be felt by humans, and which are produced by earthquakes or volcanic eruptions.
The team says shock waves with the same characteristics were observed at all of the locations after the eruption.
The team says its analysis so far shows that the equipment began detecting shock waves with long wavelengths about seven hours after the eruption.
https://www3.nhk.or.jp/nhkworld/en/news/20220118_01/
