Only the matters can move or wave. Gravity is an attraction force, it is coexisting with matters all the time.

A gravity wave is none existing made up scientific BS word puzzle similar to the photon, quantum, black hole, etc.

If you want gravity to wave, you must wave the matters and the matters and the force are coexisting, therefore if the sun has a quake, we will simultaneously feel it.

All reality, all existence, all motions are simultaneously going on at this very moment.

Past and future are memories and dreams.