Tsunamis

• Where does the word Tsunami come from and what does it mean?

  Japanese words

  Tsu - means Harbour

  Nami - waves
• What is a Tsunami? 


  A series of ocean waves caused by an earthquake at sea.
• How do Tsunamis form?

  1. an earthquake occurs

  2. Land moves upwards along fault.

  3. Displaces water upwards

  4. Water is driven by energy beneath surface moving quickly.

  5. Water moving to open ocean can travel for km with no effect until it hits land.

  6. Wave moves towards shore.

  7. Reaches shallow water and friction from seabed causes wave to slow and gain height - creating Tsunami.
• Where do most Tsunamis occur?

  80% occur within Pacific Oceans "ring of fire"
• Is the first wave of a Tsunami the strongest?

  No successive waves get bigger and stronger.
• How fast can Tsunamis travel?

  Speeds of 805km/h - as fast as a jet plane.
• Do Tsunamis lose energy or gain energy?

  They can travel across oceans and keep the same energy.
• What damage do Tsunamis cause?

  Cause destruction and death when they recede.
• How do they cause death and destruction?

  1. You cannot escape a Tsunami.
  2. Little time to escape especially in coastal regions.
  3. Buildings get destroyed. Ppl get hurt , electrocuted or hurt in gas explosions.
  4. Floating debris can hurt or kill ppl
  5. T cause disease spreads bacteria. Lead to death