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Flashcards in 1 natural and tectonic hazards Deck (21)
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1

what is a natural hazard

A natural hazard is a large scale natural event that provides a major risk to human life

2

what is the theory of plate tectonics

convections currents pull the earths plates away from each otherm causing land to move overtime

3

what are the three types of boundaries and what occurs at each one

Destructive-Oceanic plate slides underneath the continental plate
Constructive-Plates move away from each other
conservative-Plates slide against each otherm creating tension either going in opposite directions or the same directions at different speeds

4

what causes an earthquake

tension building as plates get stuck when they move past each other, it is when the ground snaps and this tension is released that causes an earthquake

5

what causes a volcano

pressure building up and magma moving through the cracks

6

what are the two types of natural hazards

meterlogical- weather related
geological-tectonically related

7

primary effect of an earthquake and a volcano

eq- buildings collapsing, crushes
volcanoes- pyrocolastic flows, ash clouds, lava

8

secondary effects of volcanoes and earthquakes

eq- long term economic damage and homeloss
volcanoes-the same as above

9

how is an earhtwuake measured and how does the scale used work

richter scale which measures shakingm every new level goes up by 10x

10

two factors that effect hazard risk

vulnerability and ability to cope

11

at which marhins do volcanoes occur

destrucive and construcitve

12

what is an epicentre and a focus

Define an epicentre- the point above the ground where the earthquake originated
Define the focus- the point underneath the ground where the earthquake originated

13

four hazard management strategies

predict
plan
monitor
protect

14

why might someone choose to live by an area of high risk (three reasons)

-fertile land
-job
-family

15

whatare the two types of crust and which one is thicker

oceanic-thicker (30-50km)
continetal (10km)

16

give an example of a long term response (2)

-aid
-economic initiatives

17

give an example of an immediate response (2)

-evacuation
-emergency services

18

new zealand and haiti deaths/injuries

nz- 2000
haiti- 500000

19

new zealand primary effects
haiti

nz- few building collapsed 2000 death injuries
haiti- destruction of peoples homes, 500000 deathsinjuries breakdown of infrastructure

20

nz and haiti secondary effects

nz- travel disruption
haiti- mass homelessnessm breakdown of ports infrastructre

21

nz and haiti responses

nz- earthquake proof buildings aid sent by australia and emergancy response plan
haiti-people were pulled out of rubble, global aid was sent