https://www.npr.org/2022/01/18..../1073800454/nasa-sci

NASA: Tonga blast was 10 megatons, more powerful than a nuclear bomb : NPR
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NASA: Tonga blast was 10 megatons, more powerful than a nuclear bomb : NPR

Researchers who have been studying the volcano since 2015 say it was likely caused by seawater flowing into a chamber filled with magma.