Tsunamis-Lesson 9

Question 1

Is a tsunami a Primary or Secondary earthquake hazard?

Answer 1

secondary

Question 2

What is most common cause of a Tsunami?

Answer 2

Tectonic activity at subduction zones

Question 3

Other than earthquakes what are 3 other causes of tsunami’s

Answer 3

Landslides, volcanic eruptions and asteroid strikes

Question 4

Where are 90% of tsunamis generated?

Answer 4

Within the pacific basin

Question 5

Since what year has the tsunami warning system in hawaii been in place?

Answer 5

1968

Question 6

What are a series of waves called in a tsunami?

Answer 6

A wave train

Question 7

In open ocean what is the wavelength and waveheight like?

Answer 7

A very long wavelength
Shorter waveheight

Question 8

What happens to the velocity of the wave when it arrives in shallow waters?

Answer 8

The velocity decreases due to friction with the seabed

Question 9

What happens to the height of the wave when it gets into shallower water?

Answer 9

Wave height increases

Question 10

What happens to the wavelength of a wave when it reaches the shore?

Answer 10

Wavelength decreases (to 20km)

Question 11

What are tsunamis created by?

Answer 11

Water column displacement caused by undersea plate movements