Lecture Twenty Eight - Geo-hazards and plate tectonics

Question 1

define a geohazard.

Answer 1

Geohazards are events caused by geological features and processes that present severe threats to humans, property and the natural and built environment. Earthquakes, floods, landslides, volcanoes, avalanches and tsunamis are typical examples of such events.

Question 2

How has the cost of geohazards changed?

Answer 2

Cost has increased due to the increased number of people living on the Earth, and therefore more people are living in hazardous areas.

Question 3

What happens when a earthquake occurs?

Answer 3

Ground shaking. 
Liquefaction. 
Tsunami. 
(Landslides). 
(Avalanches).

Question 4

What happens when volcanoes occur?

Answer 4

Laval flow. 
Pyroclastic flows. 
Ash clouds. 
Volcanic gases. 
Lahars. 
(Tsunamis). 
(L.I.P.s - large igneous provinces).

Question 5

What happens when mountain building occurs?

Answer 5

Land slides. 
Rock falls. 
Avalanches. 
Mud flows. 
(Volcanoes). 
(Tsunamis). 
(Earthquakes).

Question 6

What happens when the Earth is impacted?

Answer 6

Asteroid impacts. 
Comet impacts. 
(Tsunamis). 
(Volcanoes). 
(L.I.P.s - Large Igneous Province).