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A Tsunami Is. . .

Explore the risks posed by tsunamis, including flooding, contamination of drinking water, fires, and loss of vital infrastructure. Learn about the characteristics of tsunamis and how to prepare for and respond to tsunami warnings. Debunk common myths about tsunamis.

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A Tsunami Is. . .

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  1. A Tsunami Is. . . An ocean wave produced by earthquakes or underwater landslides.

  2. Tsunami Tsunami – Japanese meaning Harbor Wave due to the devastating effects they have on harbors • Often incorrectly referred to as tidal Waves

  3. Risks Posed by Tsunamis Tsunamis can cause: • Flooding. • Contamination of drinking water. • Fires from ruptured tanks or gas lines. • Loss of vital community infrastructure.

  4. Tsunami • Pose the greatest risk to areas less that 25 ft. above sea level • Within 1 mile from shore

  5. Tsunamis • Six Tsunamis have hit the U.S. since 1945 • 24 in the last 225 years

  6. Tsunami • Tsunami can travel upstream in rivers • Causing Flooding in area much further inland • Occur during any season anytime of year, day or night

  7. Tsunami • 1st wave of a Tsunami is usually not the largest • Series of waves that can build up • Many factors effect the size and depth of waves – mainly it’s the ocean floor that has the greatest effect

  8. Start of a Tsunami Wave

  9. Begins to increase in size and #

  10. Increasing right before your eyes

  11. Getting Bigger

  12. Increasing in size until it hits land

  13. Destruction to everything in path

  14. Tsunami in Thailand

  15. Water goes until elevation stops it

  16. Tsunami Warning Tsunami Warning originate from two agencies • The West Coast/Alaska Tsunami Warning Center (California, Oregon, British Columbia & Alaska) • The Pacific Tsunami Warning Center (Hawaii, U.S. Territories in the pacific basin)

  17. Tsunami Preparedness • Know the risk. • Plan and practice evacuation routes. • Discuss tsunamis with your family. • Talk to your insurance agent. • Use a NOAA Weather Radio.

  18. Evacuation Routes • Pick a location at least 100 ft. above sea level or go at least 2 miles inland • Should be able to get there in 15 minutes

  19. If a Tsunami Warning Is Issued • If in a tsunami risk area, evacuate immediately. • Follow instructions issued by local authorities. • Get to higher ground as far inland as possible. • Listen to a NOAA Weather Radio or Coast Guard emergency frequency station. • Return home only after local officials tell that you it is safe.

  20. Myth & Fact • Myth – Tsunami are great walls of water • Fact – Appearance of fast rising water, like high tide that occurs much more quickly (10-60 mins.)

  21. Not big wall of water

  22. Myth & fact • Myth – Boats should seek shelter in harbors • Fact - Safest place is in the deepest waters

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