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In 1955, the US Navy exploded a nuclear bomb underwater in Operation Wigwam. This test was conducted only 500 miles from San Diego, California. The purpose of the test was not to create a tsunami, but to study the effects of underwater nuclear blasts on submarines. The test did produce surface waves that spread out over a wide area, but no tsunamis.

Also from wikipedia:

During the Cold War, underwater explosions were thought to operate under the same principles as tsunamis, potentially increasing dramatically in height as they move over shallow water, and flooding the land beyond the shoreline. Later research and analysis suggested that water waves generated by explosions were different from those generated by tsunamis and landslides. Méhauté et al. conclude in their 1996 overview Water Waves Generated by Underwater Explosion that the surface waves from even a very large offshore undersea explosion would expend most of their energy on the continental shelf, resulting in coastal flooding no worse than that from a bad storm.

I think the only way a "tsunami bomb" could work is if it triggered an underwater landslide large enough to produce a tsunami. But there would be no way of ensuring such an explosion would produce the desired effects.

- Pete
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