Nature + Relation To Plate Movement

Question 1

How many earthquakes occur on intraplate

Answer 1

90%

Question 2

How many earthquakes occur a year

Answer 2

Several million
15 at magnitude of 7-7.9

Question 3

How many die of seismic hazards

Answer 3

63,000

Question 4

Constructive (3)

Answer 4

Shallow focus
Small
Mid ocean ridges - little risk to life

Question 5

Conservative

Answer 5

Shallow

Question 6

Destructive collision (2)

Answer 6

Mainly shallow
Some deeper

Question 7

Destructive subduction (2)

Answer 7

Range from shallow to deep
Can occur along any point on the subduction zone

Question 8

Tsunamis charcetreistics (4)

Answer 8

Very long wave lengths - over 10km
Low wave height - 1m in open ocean
Travel very quick - 700km/hr
Consist of a series of waves

Question 9

Approach the coast: tsunamis (2)

Answer 9

Slow down and pile up as massive wall of water before breaking
Tsunamis wave = 30m high

Question 10

Where do tsunamis occur

Answer 10

Up to 90% of tsunamis associated with seismic icy along ring of fire

Question 11

Resent destructive tsunami (5)

Answer 11

December 2004 = Boxing Day tsunami
mag 9 earthquake
300,000 killed
Outcome = warning set up among countries that border Indian Ocean
Damage by insurers = 5 billion dollars

Question 12

Japan tsunami (6)

Answer 12

March 2011
Mag 9 earthquake
Waves = 40m
30bn dollars damages
16,000 died
Over 300,000 displaced from homes