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Lots of lightning recorded
During 1719-2300 on 15 January there were almost 400,000 lightning events recorded in the plume -
Volcano was relatively inactive before 2014
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the Hunga Tonga–Hunga Haʻapai volcano erupted
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Island had increased
The island had increased in size by 300-600 metres from the eruption -
Several surges of Surtseyan activity occurred
Many passengers witnessed these many surges while on the small South Seas Charters boat