At the bottom of which ocean is the epicenter of the earthquake?

The answer to this question is very ambiguous, because there are several earthquake epicenters at once. But if we talk about the ocean floor, that is, the epicenter is in the Indian Ocean, but most of them are in the Pacific Ocean, especially closer to the coast. For example, Japan is located in a seismic zone, there is a high probability of earthquakes. Suffice it to recall the giant tsunami that took thousands of lives in Thailand, as it also happened in the Pacific Ocean as a result of a strong earthquake.