A land volcano eruption can cause tsunamis by breaking down and forcing large amounts of ash and debris into the water thus displacing the water. The more debris will create a bigger wave.
Tsunamis can also be created by submarine volcanoes, which are basically volcanoes under water. The under water volcanoes can collapse downwards to the sea floor and create massive landslides and pyroclastic flows which is a dense mixture of hot blocks, pumice, ash and gas.
Tsunamis can also be created by submarine volcanoes, which are basically volcanoes under water. The under water volcanoes can collapse downwards to the sea floor and create massive landslides and pyroclastic flows which is a dense mixture of hot blocks, pumice, ash and gas.