Volcanoes can lead to tsunamis in a few ways. One way is when a volcanic eruption triggers a landslide, causing a large amount of material to fall into the ocean. This displacement of water can generate a tsunami. Additionally, volcanic eruptions can cause the seafloor to rise or sink, creating a disturbance in the water that can propagate as a tsunami. It's important to note that not all volcanic eruptions result in tsunamis, but some can have this effect depending on the specific circumstances.