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December 17, 1997
Strong activity was detected at Monowai
Seamount starting on December 5. This activity began with a large explosion.
This is believed to be an eruption larger than those of September 20-22,
1996 and April 17-20, 1997.
February 28, 1997
Hydro-acoustic waves indicating the eruption of a sub marine volcano were recorded on February 28. This volcano is located in the Tonga-Kermadec area. Currently, the source of these waves is believed to be Monowai volcano.