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A2 GEOGRAPHY > Tectonic Hazards > Flashcards

Tectonic Hazards Flashcards

1
Q

What are the 3 types of material that can be ejected from a volcano?

A

Gas
Solids
Liquids

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2
Q

Examples of gas to be ejected from a volcano?

A

Carbon monoxide
Hydrogen sulphide
Sulphur dioxide
Chlorine

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3
Q

Examples of solids to be ejected from the volcano?

A

Ash, dust, glassy cinders
Blocks of solidified
Pumice stone

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4
Q

Examples of liquids ejected from a volcano?

A

Lava bombs- tephra or pyrolasts.

Which solidify in air- eg pumice

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5
Q

Who was the first to consider the structure of the Earth and when?

A

The Greek philosopher Plato

2000 years ago

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6
Q

Who came up with the first theory, when and what was it?

A

Edmund Halley
1692
The earths structure was made of hollow spheres

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7
Q

What shape is the earth?

A

A geoid

Bulged around the equator and flatter at the poles

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8
Q

Why is the earth shaped the way it is?

A

Due to centrifugal forces.

These are generated by the earths rotation, this forces the molten interior outwards

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9
Q

Description of the crust.

A

Thin-

5-10m beneath the oceans to nearly 70km beneath the continents

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10
Q

What are the two types of crust?

A

Oceanic and continental

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11
Q

Description of oceanic crust?

A

Broken layer of basalt rocks

Sima- made up of silica and magnesium

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12
Q

Description of continental crust?

A

Bodies of granite rocks

Sial- silica and aluminium

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13
Q

Difference between Sima and Sial?

A

Sial is much thicker and less dense.

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14
Q

What is the lithosphere?

A

What the crust and upper mantle makes up.

Where tectonic plates are formed.

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15
Q

Description of the mantle?

A

Widest section- 2900km

Silicate rocks are in a thick liquid state which becomes denser the deeper you go.

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16
Q

Why is the mantle a liquid state?

A

Due to the great heat and pressure within this zone.

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17
Q

What is the asthenosphere?

A

A layer of softer almost plastic like rock.

Moves slowly carrying the lithosphere on top.

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18
Q

Describe the core temperature?

A

Centre and hottest part- above 5000 degrees C

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19
Q

What is the core made from?

A

Iron and Nickel

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20
Q

Is the core more dense than the crust?

A

Yes the core is 4 times denser than the crust

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21
Q

How many parts make up the core?

A

2- outer and inner

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22
Q

Describe the inner core?

A

Solid and made up of an iron nickel alloy

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23
Q

What is thought to create the earths magnetic field?

A

The spinning of the liquid outer core when the earth rotates

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24
Q

Describe the outer core?

A

Semi liquid and consists mostly of iron

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25
Q

What does the cores heat generate?

A

Convection currents in the mantle that spread very slowly within the asthenosphere.

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26
Q

What causes convection currents?

A

Radioactive decay of elements in mantle and core- e.g Uranium

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27
Q

How do the convection currents cause movements?

A

The current in the asthenosphere create drag on the base of the tectonic plate.

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28
Q

How is new crust created?

A

When convection currents diverge. Magma plumes rise and cool to form new crust.

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29
Q

Describe sea floor spreading?

A

When convection currents diverge beneath an oceanic plate. It created structures called mid-ocean-ridges. Ridges of higher terrain on either side of the margin. Eg- mid Atlantic ridge.

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30
Q

Describe mid-ocean ridges?

A

Chains of submarine mountain ridges with regular transform faults across the ridges at right angles to the boundary. Can rise up to 4000m.

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31
Q

Alfred Wegner info

A

In 1912 proposed continental drift
Pangea
Based theory on geological evidence and fossil records.
Couldn’t back up with a mechanism

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32
Q

When did more plate tectonics theory come to light?

A

1950’s- palaeomagnetism

1960’s- sea floor spreading

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33
Q

Geological evidence example 1

A

Glacial deposits and striations (rock scratches) in Brazil match those in west Africa

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34
Q

Geological evidence example 2

A

Matching rock sequences of age and composition linking Scotland and Canada.

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35
Q

How does geological evidence support continental drift?

A

These rocks and mountains must’ve formed under the same conditions to match- this would only be possible if the continents were once joined

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36
Q

Evidence for Continental drift?

A

Geological
Climatic
Biological
Jigsaw

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37
Q

Fossil record example?

A

Mesosaurus (reptile) found in Brazil and South west Africa.

Glossopteris (plant) found in South America, Africa, India and Australia.

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38
Q

Living species example?

A

Earthworms from the same family found in New Zealand, parts of Asia and North America.

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39
Q

Climatic example?

A

Coal which is only formed under warm wet conditions has been found beneath the Antarctic ice cap. This can only be explained by Antarctica being once positioned in warmer latitudes.

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40
Q

Process when oceanic plate combines with continental?

A

Subduction

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41
Q

Which plate is denser?

A

The oceanic plate

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42
Q

Which plate subducts?

A

The oceanic plate

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43
Q

Where is the exact point of collision at a destructive margin?

A

The bending of the oceanic plate- deep open trench

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44
Q

Give an example of a deep ocean trench?

A

Peru- Chile trench along the Pacific Coast of South America

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45
Q

What happens to the continental plate when it meets an oceanic plate?

A

The continental land mass is uplifted, compressed and buckled and folded into chains of fold mountains

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46
Q

Example of fold mountains?

A

Andes

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47
Q

What happens to the oceanic plate after subduction?

A

Melts at depths beyond 100km and completely destroyed by 700km.

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48
Q

Where is the zone where melting occurs of the oceanic plate?

A

Benioff zone

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49
Q

What is the melting of the oceanic plate caused?

A

Increasing heat at depth and the friction between the plates

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50
Q

What may friction create?

A

Tension and stresses building up, may be released as deep focus earthquakes

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51
Q

What happens to the oceanic plate once it’s been melted?

A

Creates magma- less dense than the asthenosphere
Rises in plumes
Through faults in the buckled plate

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52
Q

What occurs when two oceanic plates meet?

A

The faster of denser subducts

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53
Q

What is formed when two oceanic plates meet?

A

Deep ocean trench

Rising magma from Benioff zone forms crescents of submarine volcanoes which may form Island arcs

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54
Q

Give an example of a trench formed by two oceanic plates colliding?

A

Marinas trench

Pacific subducts under Philippine

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55
Q

Why does subduction not occur when two continental plates meet?

A

Both plates are of lower density than the asthenosphere beneath them

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56
Q

What is formed when two continental plates meet?

A

Sediment between them becomes uplifted and buckle to form high fold mountains.

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57
Q

Example of a fold mountain?

A

Himalayas

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58
Q

What else occurs when 2 continental plates collide?

A

Shallow focus earthquakes

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59
Q

Describe a conservative plate margin?

A

Friction
Stress builds when sticking occurs.
Stresses released as shallow focus earthquakes

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60
Q

Example of a conservative margin?

A

San Andreas fault

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61
Q

Earthquake example along the San Andreas fault?

A

LA Northridge 1994

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62
Q

What are the two kinds of plate divergence?

A

Oceanic- sea floor spreading

Continental- rift valleys

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63
Q

How are rift valleys formed?

A

Lithosphere stretches, fractures into parallel faults

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64
Q

Describe rift valleys?

A

Sets of parallel faults

The land between the faults collapse into deep, wide valleys which are separated by upright blocks of land called horsts

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65
Q

How are hotspots formed?

A

Concentrated decay in the core. Localised thermal currents- plumes rise vertically.
Plumes burn through the lithosphere
Movement of plate results in chain

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66
Q

Facts about Hawaii?

A

Pacific plate moves north west at a rate of 5-10cm per year

Shield volcanoes- runny lava

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67
Q

Benefits of volcanoes?

A

Lava flows create new land
Geothermal power from hot rocks
Igneous rocks contain valuable minerals- gold, silver, copper and diamonds

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68
Q

What are the 3 intrusive volcanic features?

A

Dykes
Sills
Laccoliths- batholiths

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69
Q

Describe dykes?

A

Where the magma solidifies in a fissure (vertical crack)

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70
Q

What can dykes form?

A

More resistant- prominent wall like features

Less resistant- ditch like features

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71
Q

What are sills?

A

When magma solidifies into horizontal or in between layers of pre-existing rock

72
Q

What is a laccoliths and batholiths?

A

When viscous magma forces the overlying rock strata or layers into a dome

73
Q

Causes of tsunamis?

A

Seismic activity generated by ocean floor earthquakes or submarine volcanic eruptions.
This displaces a large volume of water
Causing a series of waves

74
Q

What is the wave height of tsunamis?

A

Low- less than 1m

Increase to over 25m upon reaching the shore

75
Q

What is the wavelength of tsunami’s?

A

Very long

100-1000km

76
Q

What speed do they travel at?

A

640-960 km

77
Q

Is the first wave the biggest?

A

Not always

78
Q

What is the wave period?

A

Between 10-60 minutes

79
Q

Where do most tsunami’s occur?

A

90% in the Pacific Ocean

80
Q

Different types of lava at which margins?

A

Basaltic at Constructive

Andesitic and rhyolitic at destructive

81
Q

Describe basaltic lava?

A

Iron and magnesium
Low in silica
Fluid and free flowing

82
Q

Describe acidic lava?

A

Rich in silica
Viscous
Violent eruptions as gas cannot escape

83
Q

Four main types of volcanoes?

A

Dome
Caldera
Shield
Fissure

84
Q

Describe dome volcanoes?

A

At destructive margins
Acidic lava
Steep sided
Eg- puy de dome in France

85
Q

Describe caldera?

A

Central part of volcano has collapsed
Very wide circular crater
Destructive margins
Acidic lava

86
Q

Describe a shield volcano?

A

Gently sloping sides
Occur at hotspots or constructive margins
Basaltic lava

87
Q

Describe a fissure volcano?

A

Long linear vent
Fairly flat surface
Constructive
Basaltic lava

88
Q

Hot spring fact file

A 
Groundwater emerges from surface 
Water is heated by volcanic activity 
Temperatures upto 90 degrees
Water has a high mineral content 
Eg- North Island New Zealand
89
Q

Geothermal features

A

Hot spring, geysers and mud pools

90
Q

Geysers

A

Hot water and steam ejected through faults in the rock
Groundwater is heated to above boiling point
Hot water becomes pressurised
Eg- Old Faithful- Yellowstone

91
Q

Mud pools?

A

Form in areas with very fine- grained soil.
The hot spring mixes with the soil
Eg- Yellowstone and Iceland

92
Q

Impacts of volcanoes?

A

Lava flows burn crops

Ash fall buries crops and creates air pollution- breathing difficulties

93
Q

How are mid ocean ridges formed?

A

By sea floor spreading

Diverging plates

94
Q

How are rift valleys caused?

A

Stretching and collapsing of the crust

Diverging continental plates

95
Q

How do mid ocean ridges cause earthquakes?

A

Sections may widen at different rates and times. This leads to frictional stress building up.
Released as a shallow focus earthquake

96
Q

Describe mid ocean ridges?

A

Can rise up to 4000m
Middle are marked by deep rift valleys
Over time the rift valleys widen due to magma rising from the aesphenosphere and solidifying as new crust.

97
Q

What are horsts?

A

The upright blocks that separate the valleys in rift valleys

98
Q

How was the Great African Rift Valley formed?

A

Magma from the asthenosphere rising to heat the overlying plates which expand and bulge to create horsts. Eg- Ethiopian highlands
As the heating plate is stretched it causes it to fracture along fault lines.
This leads to fallen blocks of lowland called grabens

99
Q

Describe a Rift Valley?

A

Land between the faults collapse in deep, wide valleys

100
Q

What a grabens?

A

Blocks of fallen lowland

101
Q

Different types of eruptions?

A 
Icelandic 
Hawaiian
Strombolian 
Vulcanian 
Vesuvian 
Peléean 
Plinian
102
Q

Background info on Montserrat.

A

Popular holiday destination for rich and famous
Island arc formed where the Atlantic plate subucts beneath the Caribbean plate
Most of the island are composite volcanoes
Island is 16KM long and 10KM wide

103
Q

Eruption details? Montserrat

A

Eruption on 25th June 97
Dome of volcano collapsed
Sending 5 million cubic metres of hot rock down the Soufriére hills to
South of island covered by pyroclastic flows of hot ash, mud and rock

104
Q

Montserrat preparation?

A

Exclusion zones- safe and evacuation zones
August 1995- south of island evacuation to churches and halls in the north.
April 96- the entire population of Plymouth was forced to leave

105
Q

What were the immediate effects of Montserrat?

A

19 deaths from fires associated with deaths from pyroclastic flows. Many burn and inhalation injuries
2/3 of all houses were either buried by ash or flattened by rock.
Farmland and 3/4 of infrastructure destroyed

106
Q

Has Chances peak erupted since?

A

In 2010 chances peak explosively erupted

107
Q

Immediate responses to the Montserrat eruption?

A

The Montserrat volcano observatory was set up in 1995.
Red Cross set up temporary schools and provided medical support and food
Warning systems were set up- speakers, sirens
USA and British navy troops carried out evacuation
£17 million from you UK govt

108
Q

Long term responses? Montserrat

A

3 year redevelopment programme for schools, houses and medical services
Young people moved away- leaving an ageing population

109
Q

What eruption is etna? How has it been caused?

A

Strombolian

Collision of African and Erasion plates- linked to rifting

110
Q

Impact of Mt Etna eruption?

A

Lava destroyed springs with supply water to Zaffefena- town of 8000 people
Several people lost homes and farmland

111
Q

Management of Etna?

A 
Lava diverted away from Zafferena. 
First earth barriers with were overcome 
Explosives used to divert flow into a man made channel
Concrete blocks to plug lava 
1991-1993
112
Q

Immediate effects of earthquakes?

A

Ground shaking destroys infrastructure and buildings
Immediate deaths and injuries from crushing
Liquefaction
Landslides caused by slope failure

113
Q

Secondary effects of earthquakes?

A

Fires caused by broken gas pipes
Injuries may result in long term disability
Power cuts restrict emergency services
Dead bodies will spread disease such as Cholera

114
Q

What influences the consequence of the Earthquakes.

A 
Magnitude 
Depth 
Location of epicentre 
Pop density 
Education 
Building strength 
Time of day
115
Q

Earthquake prediction?

A 
Micro quakes
Ground bulging 
Magnetic changes within rock 
Increased argon content in soil 
Curious animal behaviour
116
Q

Features of an earthquake proof building?

A

Rolling weights on roof to counteract shock waves
“Birdcage” interlocking steel frame
Reinforced foundations deep in bedrock
Rubber shock absorbers between foundations

117
Q

Other planning for earthquakes?

A

Designed infrastructure to withstand shaking
GIS can be used to prepare hazard maps to show areas of great risk
Public education- earthquake drills

118
Q

What term is used to describe planning for hazards?

A

Contingency planning

119
Q

Socio-economic effects of Hati earthquake 2010?

A

230,000 to 250000 lives lost, many due to building collapse
50% of building collapsed- inc Parliament and Police headquarters
Capital flattened
1.5 million homeless
Infrastructure- main port and roads

120
Q

Environmental effects of Hati 2010?

A

Liquefaction- building foundations subsided
Ground slumping
Small localised tsunami- killed 7
Landscape permanently disfigured- corals pushed upwards and farmlands collapsed

121
Q

How many people died in Christchurch?

A

185

122
Q

What happened in l’aquila in 2002?

A

A 5.5 quake caused a primary school to collapse despite being built to ‘national standards’

123
Q

Hazards associated with volcanoes?

A

Pyroclastic flow
Dust emissions seed torrential rainfalls resulting in mud lahars
Flooding results from volcanic debris blocking rivers

124
Q

Which eruptions have basaltic lava?

A 
Icelandic
Hawaiian 
Strombolian 
Vulcanian 
Vesuvian
125
Q

Which eruptions have rhylotic lava?

A

Vulcanian
Vesuvian
Peléean
Plinian

126
Q

Which eruptions are andesitic?

A

Vulcanian
Vesuvian
Peléean

127
Q

Characteristics of Icelandic eruption?

A

Lava flows gently from fissures

128
Q

Characteristics of Hawaiian eruption?

A

Lava flows gently from a central vent

129
Q

Characteristics of a Strombolian eruption?

A

Frequents explosions of tephra and steam. Occasional, short lava flows

130
Q

Characteristics of Vulcanian eruption?

A

Less frequent, but more violent eruptions of gases, ash and tephra

131
Q

Characteristics of a vesuvian eruption?

A

Following long periods of inactivity, very violent has explosions blast ash high into the sky

132
Q

Characteristics of peléean of eruptions?

A

Very violent eruptions of nuées ardentes

133
Q

Characteristics of Plinian eruptions?

A

Exceptionally violent eruptions of gases, ash and pumice. Torrential rainstorms cause lahars.

134
Q

Definition of a dormant volcano?

A

Has not erupted within historic times. More than 10,000 years is extinct

134
Q

Montserrat warning signs?

A

July 1995- volcano began to erupt ash and dust.

Scientists began to monitor gases, microquakes and changes in the volcano shape.

135
Q

Describe palaeomagnetism?

A

Every 400,000 years the Earths magnetic field switches polarity. Particles of iron oxide in the ocean floor records the magnetic orientation of that time.
The older lavas were further away from the ridge.

136
Q

Different types of Seismic waves?

A

Primary- fastest, compressions, can travel through all
Secondary- half as fast, shake, through crust and mantle only
Surface- slowest, cause most damage
Rayleigh- low frequency rolling motion

137
Q

Mercalli scale?

A

Imperceptible
Moderate
Destructive
Catastrophic

138
Q

How are earthquakes caused?

A

Stress builds in lithosphere due to friction.

When stress is overcome, fractures cause faults. This sends seismic shockwaves to the surface.

139
Q

Difference between focus and epicentre?

A

Focus is the breaking point of the earthquake.

Epicentre is the point on the surface directly above the focus.

140
Q

What effects the nature of the hazard?

A 
Frequency 
Warning signs? 
Magnitude 
Duration 
How large an area did it effect
141
Q

What makes a population vulnerable?

A 
Population - density 
Economic 
Land use 
Emergency services
Type of population 
Hazard proof buildings
142
Q

Strategies to manage volcanoes?

A 
Exclusion zones 
Emergency shelters
Drills/ sirens 
Use of media 
Emergency services
143
Q

Fumarole?

A

Outlets of steam and gas
Gas can be carbon dioxide and monoxide
Solfatara when sulphurous gas- Naples

144
Q

Define natural hazard?

A

A natural hazard is a threat of a naturally occurring event that will have a negative effect on people or the environment. Many natural hazards are interrelated, e.g. earthquakes can cause tsunamis and drought can lead directly to famine.

145
Q

How many people are at risk from Etna?

A

900,000

146
Q

Years when Etna erupted?

A

1991- 1993
2001
2002
2009

147
Q

Sea floor spreading?

A

American geologist studied ages of rocks. Oldest rocks nearer to coast to USA and Caribbean.
Rate of 5cm a year

148
Q

Features with Constructive margins?

A

New crust and basaltic rocks
Mid-ocean ridges
Shallow focus earthquakes
Submarine volcanoes

149
Q

Features with destructive?

A

Deep ocean trenches

Island arcs- two oceanic

150
Q

Example of deep ocean trench?

A

Peru- Chile trench along the Pacific coast of South America

151
Q

Describe Hawaii?

A

Pacific plate moves- 5-10cm a year
Shield volcanoes
Pahoehoe and blocky aa lava common
Mauna Loa

152
Q

What happens to Hawaii when moves away from hotspot?

A

Lava becomes more Alkali, cinder cones may appear

Steep sided cones associated with pyroclastic flows

153
Q

Secondary effects of Haiti?

A 
Strong aftershocks- 6.1
Government crippled 
Inflation in food prices 
Prison destroyed- lawless 
Cholera kills- 1500
154
Q

Immediate responses to Haiti?

A

International search teams- UN
US military distributed aid
16,000 UN troops to restore order
UN world food programme

155
Q

Long term Haiti responses?

A

$11.5 billion reconstruction package
farming reform
Life safe building codes- locals employed as builders

156
Q

Difference in price of traditional and life safe buildings?

A

Cost 15% more

157
Q

When did l’aquila occur?

A

2009

158
Q

Cause of Haiti?

A

Strike- slip fault

Carribean and North American plate

159
Q

Factors of Haiti earthquake?

A 
In late afternoon 16.53
Magnitude 7
Shallow focus- 13km 
Epicentre- 24km from Port-au-prince 
70% pop on less than $2 per day
160
Q

Causes of l’Aquila?

A

African plate pushing north on Eurasian plate

Slip fault line underneath mountain range

161
Q

Factors of L’Aquila earthquake?

A

Occurred at half 3 in the morning
Epicentre 7km from l’Aquila
300 aftershocks
Shallow focus- 10km

162
Q

Impacts of l’Aquila?

A 
305 deaths- died in sleep
Thousands homeless- 34,000 in tents 
Historic capital badly affected 
Architectural building destroyed 
10,000 building altogether 
Roman baths and medieval villages
163
Q

Responses of l’Aquila? I

A

Rescue efforts haulted by Aftershocks
People still in temporary accommodation 3 years later
Rebuilding programme- $16 billion

164
Q

Countries effected by Boxing Day

A

Indonesia, Thailand and Sri Lanka

165
Q

Deaths and missing after Boxing Day?

A

Total- 290,000

Indonesia- 236,000

166
Q

Cause of Boxing Day?

A

Indo- Audtrailian plate pushing north under Eurasian plate

Ocean floor pushed up several metres

167
Q

Secondary affects of Boxing Day!

A

500,000 homeless refugees
44% lost livelihoods in fishing/ agriculture and tourism
Thailand loss of fishing industry- £226m
Negative multiplier effect
Water supplies contaminated by salt water

168
Q

Immediate responses of Boxing Day?

A

160 aid organisations

Australian Air Force

169
Q

Long term responses to Boxing Day?

A

Tourist facilities prioritised
Education in schools and practice drills
Reconstruction- thousands homeless years later
Political barriers and tension

170
Q

Background to Japan 2011?

A

9 magnitude earthquake
2011
North American plate caused Pacific plate to slip upwards 10m
Japan’s warning system gave minutes to escape
10waves, overwhelmed tsunami defence walls

171
Q

Primary impacts? Japan 2011

A

Building collapsed or set ablaze- broken pipes
Flooded 500 square km
Skyscrapers shook not collapse
25,000 dead or missing

172
Q

Secondary effected? Japan 2011

A

Half a million homeless
Millions of homes without water and electricity
Shortages of food and medicine
Power plant threat of Nuclear disaster due to radiation leaks

173
Q

Intermediate responses of Japan 2011?

A

Helicopters from rooftops
No looting or violence reported
Exclusion zones set up
Survivors huddles in shelters

174
Q

Long term responses in Japan?

A

High repair bill for govt and private companies

Defence wall effectiveness questioned

A2 GEOGRAPHY (3 decks)

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