Answer: "Tsunami wave" or a "Seismic sea wave."
Explanation: The wave created by an earthquake beneath the surface of the Pacific that causes a tsunami to form is a type of seismic wave called a "tsunami wave" or a "seismic sea wave."
Tsunami waves are created by the displacement of a large volume of water, typically as a result of an undersea earthquake, but they can also be caused by volcanic eruptions, landslides, or even asteroid impacts. These waves differ from normal ocean waves in several ways.
First, they have a much longer wavelength, which means that the distance between the wave crests can be several kilometers. This is because the energy of a tsunami wave is spread out over a large area, causing the wave to travel great distances with very little loss of energy.
Second, tsunami waves can travel at very high speeds, up to 800 km/hour in the open ocean, because they are not affected by wind or other surface factors that can slow down normal ocean waves.
Finally, tsunami waves can be extremely destructive when they reach the shore because their large volume and high speed can cause them to inundate coastal areas and cause widespread damage and loss of life.
In summary, the wave created by an earthquake beneath the surface of the Pacific that causes a tsunami to form is a type of seismic wave called a tsunami wave, which is caused by the displacement of a large volume of water and can travel great distances at high speeds, leading to destructive effects when it reaches the shore.