By: Isabella Faison
-Most tsunamis are caused by earthquakes. An earthquake occurs when a large area of the Earth's crust suddenly moves. When this happens underwater, big gaps may appear on the ocean floor. When water moves in to fill this gap, a tsunami is born.
-Tsunamis are dangerous to people because they are huge waves that can flood a city. It should be a concern because tsunamis can kill and hurt people.
-80% of tsunamis happen in the pacific ocean's "ring of fire".
More about tsunami
-Tide gauges measure the height of the sea-surface and are primarily used for measuring tide levels.
-On March 11, 2011, a magnitude-9 earthquake shook northeastern Japan, unleashing a savage tsunami. On December 26, 2004, a magnitude-9 earthquake shook off the west coast of Sumatra, Indonesia that created a tsunami, killing 230,000 people.