GEOLOGY

Detailed explanation-1: -When a great earthquake ruptures, the faulting can cause vertical slip that is large enough to disturb the overlying ocean, thus generating a tsunami that will travel outwards in all directions.

Detailed explanation-2: -Tsunami waves are caused by disturbance under the sea or ocean bed.

Detailed explanation-3: -Sometimes earthquakes occur on faults under the ocean. If an earthquake disturbs the sea floor by shaking it up and down, then the earthquake energy can contribute to large waves at nearby coastlines, called a tsunami.

Detailed explanation-4: -If big enough and close enough to the ocean floor, the energy from such an earthquake can cause the ocean floor to suddenly rise (uplift) or fall (subside). It is this sudden vertical displacement of the ocean floor that typically sets a tsunami in motion.