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Tsunami

Tsunami PPT for Ess

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Tsunami

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  1. Tsunami: Wave of Change Tyler Freddy Laura Rebecca

  2. Waves 1) What determines the size of a wave and how do they move? • The size of a wave is determined by wind speed, duration, and fetch (distance) • As waves move, each parcel of water revolves in a loop (Eventually returning to its former position)

  3. Waves cont. 2) What are the most important dimensions for a wave, and how are they found? • Height (From Crest to Trough) • Wavelength ( From Crest to Crest, or Crest to Trough)

  4. Waves cont. 3) What place propagates the highest waves, and why is it important? • The mid-ocean ridges, it connects one ocean base line to the other. • Knowing this effect is helpful for forecasting waves because modelers can better estimate where the strongest wave energy will likely go.

  5. Tsunamis 4) What is a Tsunami? • Tsunamis are large series of Waves of extremely long wavelength and period (length) usually generated by a violent, impulsive disturbance or activity near the coast or in the ocean.

  6. Formation of Tsunamis 5) Where are Tsunamis frequently generated? • By shallow earthquakes all around the pacific (This accounts for 85% of Tsunamis). • However those from earthquakes in the tropical Pacific tend to be modes in size and their energy decays rapidly with distance. • This is not the case with Tsunamis generated by great earthquakes in the North Pacific or along the Pacific coast of South America.

  7. Formation of Tsunamis cont. 6) What other variables make a Tsunami? • Earthquakes, how much the sea floor moves, submarine land slides, rock falls, and under water slumps.

  8. Opinion Questions 7) What can we do to improve the global warning broadcasting system? 8) What can under developed countries do in order to prepare for future Tsunami strikes? 9) What do you think of coastal and near shore residential development.

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