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Tsunami and Tidal Waves

Tsunami and Tidal Waves. By Matt Sapp & Lauren Gareau . Wading in Water. Tsunami, commonly known as Tidal Waves come from the Japanese word Tsu for (harbor) Nami for (Wave)

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Tsunami and Tidal Waves

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  1. Tsunami and Tidal Waves By Matt Sapp & Lauren Gareau

  2. Wading in Water • Tsunami, commonly known as Tidal Waves come from the Japanese word Tsu for (harbor) Nami for (Wave) • All oceans can have tsunami’s but 80% of Tsunami’s originate in the Pacific Ocean due to large amounts of geological activity • From Japan to the West Coast of South America, tsunami’s strike with devastating consequences

  3. All Washed Up • A tsunami is a series of waves in a body of water that vertically displaces the water column • Oceanographers often refer to tsunami’s as seismic sea waves as a result of a rise or fall of the earths crust • The displacement can be caused by earthquakes, landslides, volcanic eruptions, and meteorites • All but meteorites occur under the sea • Tsunami’s are most likely to occur in April

  4. Turning the Tide • Tsunami’s can go undetected until it reaches shallow waters • Some vary from 30ft to 100ft • Tsunami’s move a the speeds approaching jet aircraft • Tsunami’s are able to be detected but the size and destructive force of them can not be predicted • The ability to detect them gives the population a chance to get cover

  5. A Wave is a Wave? • The difference between a tsunami and wave is that waves you see at the beach are generated by wind • Waves depend on the strength of the wind and the wavelengths (distance between crest/trough) is from 5ft to 1000ft • Waves moves at about 5 to 60 mph

  6. A Wave is A Wave Cont • Tsunami’s result from physical mechanisms • The magnitude of a tsunami is by the mechanism • The difference between wavelengths can range from 100-300 miles apart • Depending on depth tsunami’s can travel up to 500 mph

  7. That’s No Tsunami • Common misconceptions come regarding tsunami’s appearance but it all depends on the topography of the ocean floor • The increase in height occurs as the tsunami gets closer to land • Most think tsunami’s are large steep waves this is not always the case • Most tsunami’s appear as an advancing tide • The result is the rapid flooding of the low-lying coastal areas

  8. That’s a big Momma • The largest tsunami occurred in Lituya Bay on the southern coast of Alaska • On July 9, 1958 a earthquake caused a glacier landslide at the head of the bay • It triggered a wave that was 1720ft/524m high • This is the equivalent of over 5 football fields • This is the case of a tsunami where no people were present but this possible • Up to 36,000 people have died in a tsunami and the following flooding that occurs (Krakatoa, Indonesia 1883)

  9. A tsunami can reach the shore of any country regardless of where it starts in about a day and if local, it can reach in minutes A tsunami is more than just a single wave like an earthquakes aftershocks, tsunamis are a wave train and many people have lost their lives returning home thinking it was safe Danger Watch Yourself

  10. Crazy Pics

  11. Questions • 1. What is a Tsunami? • 2. What is the ranging height for Tsunamis? • 3. What is the difference between a Tsunami and a wave? • 4. Where and when did the largest Tsunami occur? • 5. How long does it take for a Tsunami to occur?

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