1.4: Tsunami's - part 1

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1.4: Tsunami's- part 1 

Look at the picture: what has happened (gebeurd) here?

Finish the sentence: a tsunami is...

Finish the sentence: a tsunami causes (veroorzaakt)...

Today

• Explanation 4.1 - part 1
  
• Videoclip
  
• Assignments 
  

Learning goals 

• You know what a tsunami is 
  
• You know how a tsunami is formed 
• You can point out the coastlines that can be hit by tsunamis on a map.

What is a tsunami?

An enormous tidal wave (vloed golf)

• Highest tsunami: 30.5m (1958, Alaska)
  
• Apartment building with 10 floors 
  

How do tsunami's form?

1: Earthquake in the ocean floor > low waves with high speed

2: Near the coast, waves are slowed down 

3: Water in the back is pushed up 

4: Top of the waves gets higher and higher

5: Gigantic destructive tidal wave

Shoaling effect

= the front of the wave is slowed down by the friction of the ocean floor that goes slowly up to the coast while the back of the wave still travels at full speed

Happens when the wave reaches the shallow coastal zone (ondiepe kustzone)

How do tsunami's form?

1: Earthquake in the ocean floor > low waves with high speed

2: Near the coast waves are slowed down 

3: Water in the back is pushed up 

4: Top of the waves gets higher and higher

5: Gigantic destructive tidal wave

Tsunami's: plate tectonics

• Convergent 
• Tansform

Heavy earthquakes in the ocean floor > subduction zone

Why is the ring of fire also the place with the highest risk of tsunami's?

Today

• Explanation 4.1 - part 1
  
• Videoclip
  
• Assignments 
  

00:44

What is the most common cause (meest voorkomende oorzaak) for a tsunami?

1. meteorite impact
2. Landslides
3. Volcanic eruptions
4. Earthquakes

01:34

Why don't you feel tsunami's on the open sea (de open oceaan)

1. Because it is deep
2. Because the ocean is wide
3. Because it is shallow

Learning goals 

• You know what a tsunami is 
  
• You know how a tsunami is formed 
• You can point out the coastlines that can be hit by tsunamis on a map.

What is a tsunami and how is a tsunami formed?

Which coastlines have the highest risks of tsunami's?

Today

• Explanation 4.1 - part 1
  
• Videoclip
  
• Assignments 
  

Working for yourself

• Read 1.4
• Start assignments 1.4

Done? Finish assignments 1.1 - 1.3

What did you learn today?

Which concepts do you still find difficult?