Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Events (hierarchy name)
4. events (activities)
5. natural events

Narrower term/s

• tidal waves

Anotations

Scope note:

Movements in the sea or other collection of water, by which a portion of the water rises above the normal level and then subsides, at the same time travelling over the surface; a moving ridge or swell of water between two depressions or troughs.