What's the noun for tsunameter? Here's the word you're looking for.
tsunami
A very large and destructive wave, generally caused by a tremendous disturbance in the ocean, such as an underseaearthquake or volcanic eruption. Tsunami are usually a series of waves, or wave train.
(figuratively) A large and generally unstoppable surge.
“This new, second-generation Deep Ocean Assessment and Reporting of Tsunamis system consists of pressure-sensitive tsunameters on the seafloor, and buoys on the ocean surface.”