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Tsunamis
- 3. TSUNAMIS A PRESENTATION BY ANA VIEGAS
- 5. What is a tsunami? One of the most powerful natural disasters, the tsunamis (t-soo-NAH-mee) can speed across the ocean as fast as a jet plane and wipe out villages.
- 6. What causes them? Most tsunamis are caused by earthquakes. However, tsunamis can also be caused by landslides, volcanic activity, certain types of weather, and—possibly—near-earth objects (asteroids, comets) colliding with or exploding above the ocean.
- 7. What causes them? In this animation we will see the generation of a tsunami due to seismic activity on the sea floor until the waves inundates the coast.
- 8. What causes them? Due to volcanos:
- 9. Tsunamis have a few natural warning signs, here’s the most normal of them: 1. Severe ground shaking from local earthquakes 2. As a tsunami approaches shorelines, water may recede from the coast, exposing the ocean floor, reefs and fish. 3. Approaching tsunami create a loud "roaring" sound similar to that of a train. If you experience any of these phenomena, immediately leave low-lying coastal areas and move to higher ground."
- 11. Before we see which ones were the worst tsunamis so far, let’s see how we measure their strength: How are tsunamis measured or observed? In the deep ocean, a tsunami has a small amplitude (less than 1 metre) but very long length (hundreds of kilometres). So it is practically undetectable to the human eye. However, there are ocean observing instruments that are able to detect tsunamis. This is a tsunami buoy, its sensor detects changes in water pressure and seismic activity and transmits the data back to the surface.
- 12. The biggest tsunamis ever registered! March 11, 2011: A massive 9.0-magnitude earthquake struck Fukushima, northern Japan, triggering tsunamis that reportedly swept up cars and buildings.
- 13. The biggest tsunamis ever registered! Dec. 26, 2004: An earthquake with a magnitude between 9.1 and 9.3 shook Indonesia and killed an estimated 230,000 people. The tsunami has become known as the 2004 Indian Ocean tsunami. Those waves traveled the globe – as far as Nova Scotia and Peru.
- 14. The biggest tsunamis ever registered! Aug. 27, 1883: Eruptions from the Krakatoa volcano fueled a tsunami that drowned 36,000 people in the Indonesian.
- 15. Tsunamis in films or series: Poseidon (Wolfgang Petersen, 2006)
- 16. Tsunamis in films or series: Deep Impact (Mimi Leder, 1998)
- 17. Tsunamis in films or series: 2012 (Roland Emmerich, 2009)
- 18. Tsunamis in films or series: The Impossible (Juan Antonio Bayona, 2012)
- 19. Do you know that 3.5 million years ago, a giant meteor fell into the ocean and created a huge tsunami that swept around the Earth several times?