MEMRI provides roundup of tsunami conspiracy theories: "It was caused by U.S. ,Israel, India" (MEMRI (Middle East Media Research Institute) ^ January 7, 2005)
Neither global warming nore missile tests can't cause earthquakes, and so can't cause earthquake-generated tsunamis. That's beyond reasonable dispute.
Nuclear detonations are another matter—they might cause earthquakes. But we don't do those anymore—although others still do.