Tsunami are waves that have been generated by earthquake, landslide, or caldera (volcano). Follow the links below to pages showing the data from around New Zealand for some recent tsunami.
Rissaga are waves that have been generated by weather systems.
They are sometimes called meteorological tsunami or meteotsunami.
Rissaga is a Catalan word used by the people of the Belearic Islands in the Mediterranean to describe the sometimes devastating waves they experience as a result of thunderstorms propagating rapidly down out of Europe.
In New Zealand, they occur as a result of low-pressure systems or ex-tropical cyclones emerging from the tropics and propagating rapidly down the eastern seaboard.
Follow the links below to pages showing rissaga that have occurred recently around New Zealand.