Tsunami
A series of extremely long-wavelength ocean water waves generated by sudden vertical displacement of the seafloor.
Governing formula
v = √(g d)
SI unit
m/s
In depth
In deep ocean, tsunamis behave as shallow-water waves ($lambda gg d$) traveling at speeds up to 800 km/h with low wave height (~1m). As they approach shallow coastlines, wave speed drops and height surges drastically.
Examples in the real world
Submarine earthquake displacements generating massive destructive coastal waves.