The Soloviev-Imamura intensity scale rate the intensity of these events. Shoaling causes these phenomena to slow down as they approach land, and if a trough, rather than a crest, is the first part of 
The Soloviev-Imamura intensity scale rate the intensity of these events. Shoaling causes these phenomena to slow down as they approach land, and if a trough, rather than a crest, is the first part of this phenomenon to (*) reach land, then drawback occurs, creating an apparently low tide. Underwater earthquakes can cause, for 10 points, what kind of dangerous tidal wave that devastated Japan in 2011?
The Soloviev-Imamura intensity scale rate the intensity of these events.
tsunami (prompt on tidal wave before mentioned)