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Originally Posted by SortaSavageLike
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Man-made tsunamis do not pose major threats to countries in the far field. The seismic forces that generate a tsunami powerful enough to cross an ocean basin are immense: earthquakes created by subduction (an oceanic plate grinding its way slowly under a continental plate, building pressure & ultimately rupturing) generate the energy of approximately 32 billion tons of dynamite -- imagine 2.5 million Hiroshima bombs exploding simultaneously.
After World War II, the American Navy carried out nuclear testing in the South Pacific. Scientists worried that undersea nuclear explosions would trigger tsunamis. Some tests did in fact generate tsunamis -- but the tsunamis were extremely small, on the order of a few centimeters when running up ashore on local islands.