1.5 Understanding Tsunamis

Question 1

Cause of tsunamis

Answer 1

Often by underwater earthquakes. Displaces water column.

Question 2

Height of waves as it approaches the land

Answer 2

Increases as it becomes shallower. Energy is concentrated into a smaller volume of water. Bottom of wave slows down, causing it to rise

Question 3

Reasons for intensity to increase

Answer 3

Epicentre close to populated areas. Shallow focus.
Lack of Defences/strong infrastructure due to poverty/corruption.