how does a volcano create a tsunami
Tsunamis are generated by abrupt massive movements (changes) in the sea floor. An eruption of a volcano in or adjacent to the sea may be accompanied by earthquakes, and an earthquake may move the sea floor sufficiently to generate a tsunami. A second possible way for a volcano to create a tsunami might be due to a landslide from the side of a volcano. Such a mass movement of material into the sea would also displace water, and could generate a tsunami. Additionally, sometimes volcanoes explode violently, and that mass movement of material could also create a tsunami.