Im no expert on this, but Im deckie on a scientific research vessel, and we have deployed Tsunami warning buoys off the coast of Chile and Thailand, and survey fault lines around the world. If the scientists arent too full of themselves I pick their brain a bit, cuz its pretty interesting work. Anyhow, I think the answer to your question is YES and NO.<br><br>Yes, because a Tsunami (Japanese word for “harbor wave”) is a high frequency shock wave from an earthquake, sometimes over 200 knots per hour! The Tsunami slows as it reaches shallower water, but builds in amplitude. So in a sense, people hundreds of miles away from the epicenter are feeling the EFFECTS of the the earthquake, not the earthquake itself, and I am quite certain people on boats in shallow water are in danger of its damage. <br>Ive had to heave anchor several time because of Tsunami warnings when I was working in the Aleutian Islands. We just sail to deep water until the danger passes. But in deep water, you feel nothing at all. The water compresses and releases so quickly it doesnt move at a frequency slow enough to move a ship or boat. It takes fairly sophisticated doppler sonar to detect this on the warning buoys.<br>But then again, I imagine if you were in 50 feet of water over the epicenter of an earthquake, youd feel something, but 3000 meters? no.<br>I also worked on a seismic vessel, and we would “make earthquakes” by firing powerful air cannons into the water in order to image what lies beneath the sea floor. As we would get near shallow areas the stern of the 270 foot ship would “jump” out of the sea. A shock strong enough to maybe knock over a Bic lighter sitting on a table every minute or so. nothing spectacular, but REAL annoying on a month-long cruise. We would hope to survey a deep area so we could get some sleep at night. <br>Anyhow, To answer your question, The answer is YES and NO.<br>Sort of like the theory of if a butterfly beats its wings in Africa, does it eventually cause a typhoon in Asia?