1. A tsunami is a series of large ocean waves caused by underwater disturbances such as earthquakes, landslides, or volcanic eruptions.
2. Another name for tsunami is "tidal wave," though this term is misleading as tsunamis are not related to tides.
3. Tsunamis are primarily caused by underwater earthquakes, but can also be triggered by landslides, volcanic eruptions, or meteorite impacts.
4. In the open ocean, tsunamis can move at speeds of 500 to 800 kilometers per hour (310 to 500 miles per hour).
5. In the open ocean, tsunami waves are typically less than 1 meter high, but can grow to over 30 meters (100 feet) when they reach shallow coastal waters.
6. The size of tsunami waves is influenced by the magnitude of the triggering event, the depth and shape of the ocean floor, and the coastline topography.
7. Tsunamis strike coastal areas, especially those near tectonic plate boundaries or submarine fault lines.
8. The most destructive tsunamis have occurred in the Pacific Ocean (e.g., Japan 2011, Indonesia 2004), Indian Ocean (e.g., 2004), and around the Mediterranean Sea.
9. Underwater earthquakes, particularly those occurring along subduction zones, most often generate tsunamis.
10. The first wave from an earthquake-generated tsunami can reach the beach within minutes to an hour, depending on the distance from the epicenter.
11. Coastal areas, low-lying regions, and islands near seismic zones are at highest risk of a tsunami.
12. The most common cause of death during a tsunami is drowning due to the force and volume of water.
13. Other hazards from tsunamis include flooding, destruction of infrastructure, debris impact, contamination of water supplies, and secondary fires or chemical spills.
Parent Tip: Review the logic above to help your child master the concept of tsunamis worksheet.
