Question

Why does tsunami's amplitude of wave increase overtime

Answer 1

Many of us imagine tsunamis as tall, surf-like waves, but in the deep ocean, their amplitude is actually quite small. Tsunamis get much taller as they approach the continental shelf and coastline. This process is known as shoaling, and the devastation caused by tsunamis is linked to how high they shoal. By looking at the fundamental wave characteristics of tsunamis in deep and shallow water, we can understand why shoaling happens.