What name is given to the giant wave caused by an earthquake on the ocean floor?

The phenomenon referred to as a giant wave caused by an earthquake on the ocean floor is known as a tsunami. Tsunamis are typically generated when an underwater earthquake displaces a large volume of water, creating waves that can travel across entire ocean basins at high speeds. When these waves reach shallow coastal areas, they can increase in height and cause significant destruction upon landfall.

Other terms mentioned—aftershock, volcano, and eruption—represent different geological and seismic phenomena but do not specifically describe the waves created by underwater earthquakes. An aftershock refers to smaller tremors that follow the main earthquake event. A volcano pertains to a geological structure from which molten rock, ash, and gases erupt, while an eruption denotes the act of a volcano releasing these materials. None of these relate directly to the waves generated by seismic activity in the ocean, making tsunami the accurate term for this context.