Question

• How does an underwater earthquake cause a tsunami

Answer 1

 Underwater earthquakes can trigger tsunamis by unleashing underwater landslides, which also displace huge amounts of seawater.

Answer 2

Earthquakes cause the seafloor to rise and fall. Tsunamis travel quickly, at up to 800km (500 miles) per hour. A tsunami can form a wall of water more than 24m (80 feet) high when it approaches shallow water near shore.