A destructive tidal wave is a natural phenomenon known as a TSUNAMI. Tsunamis are caused by large-scale disturbances in the ocean, such as earthquakes, landslides, or volcanic eruptions. They can cause immense destruction and loss of life when they reach land. Tsunamis can travel at speeds of up to 500 miles per hour and can reach heights of over 100 feet. They can also cause flooding, erosion, and other damage to coastal areas.