When Anak Krakatau (the little active growing volcanic island in the near-center of the Krakatoa volcano caldera) had a larger-than-normal eruption and an accompanying flank collapse, it caused a tsunami that killed some people on the nearby islands.
Scientists studying the event are trying to figure out why the tsunami waves were so big when the amount of the volcano that fell into the sea was apparently not very much.
That's what science is for -- figuring things out.
Anak Krakatau: Volcano's tsunami trigger was 'relatively small'
During the eruptive phase:
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