Phenomena, Long-Term Effects and Mitigation of Tsunami - Hardcoverby Jaden Mason (Editor) Tsunami refers to a natural disaster that is characterized by a set of long waves brought on by an abrupt movement of the ocean, which is typically caused by an earthquake near or beneath the ocean's surface. This force generates waves that travel in all directions away from the source, occasionally spanning entire basins in the ocean. The devastation caused by tsunamis on both human and natural life is immense. The long term