What do you call the leading waves and activity leading before a large wave?
Here is what I found if useful for others -
Oceanic Wave Clarification
Wave position in space (x,y) and in time (t) are different concepts
Ocean waves in time are a vertical oscillation generated most often from surface winds creating a circulation (eddy). There are no 'leading waves' to a 'big wave' rather simply a continual progression in size.
Ocean waves in space are generated from the simple motion of the wind. As the depth decreases the energy density of the wave increases, increasing the wave amplitude
Common Vocabulary (if useful)