WHY are tsunamis occurring? When large
underwater earthquakes shake the seafloor, tsunamis appear. And the stronger the shocks, the more powerful the tsunami will be.
Underwater landslides and explosions also cause tsunamis. So-called megatsunamis are caused by above-water landslides or
"glacier calving". Unfortunately, tsunamis, as well as earthquakes, are still
impossible to predict accurately.
