The natural event known for creating tsunamis is typically an undersea earthquake. When tectonic plates shift and release energy, it can displace vast amounts of water, leading to the formation of large ocean waves. Other causes of tsunamis can include volcanic eruptions, underwater landslides, or meteorite impacts. Tsunamis move at high speeds across the ocean and can travel long distances before reaching the shore. Upon approaching shallow waters, they can grow in height, causing devastating impacts when they reach coastal areas.