Geography - Edexcel AS

Geography Edexcel AS World at risk Hazards: Contents Types of hazards Key Terms Risks and Vulnerability Natural Hazard or Disaster? Is the world becoming more hazardous? Human factors Falling Deaths

Increasing Numbers of people affected El Nino & La Nina Distributions: Earthquakes, Volcanoes, Slides, Drought, Storms Hazard Hotspots: California, Philippines - Compared What is a hazard? Every year many events around the world happen that may be described as natural hazards

For a natural event or phenomena to become a hazard it has to involve people It is the way that social systems and environments link together that determines whether an event becomes a hazard What is a natural event in an uninhabited location can be a severe hazard in another place where people are involved Definition? A natural hazard is a natural event or process which affects people eg causing loss of life or injury, economic damage, disruption to peoples lives or environmental degradation.

Hazards: Two Types of hazards Geophysical Caused by earth processes. They can be caused by either Hydro-meteorological Caused by running water and its processes (hydro) and those

associated with weather patterns (meteorological) internal earth processes of tectonic activity eg volcanoes, Includes floods, debris and mudflows earthquakes, tsunamis Tropical cyclone/hurricane, storm Or by external processes of surges, thunder and hail storms, geomorphological origin tornadoes, blizzards and other

involving mass movement eg sever storm landslides, rockfalls, rockslides Droughts , bush fires temperature Read P 9-11 Pearson extremes, sand and dust storms Read p 6-8 Pearson Both geophysical and hydrometeorological? These two types of hazard sometimes overlap Eg a snow avalanche may be hydrometeorological(snow-ice) in origin, but

geophysical as an event (mass movement) Eg a landslide CAN GLOBAL WARMING BE SEEN AS A NATURAL HAZARD? then? b)Are they hydrological, meteorological, geomorphological or tectonic?

1. A cyclone affecting Hong Kong 2. A hurricane passing over a remote unpopulated island 3. A flood in a rural area which floods the roads, but does not affect any houses 4. A volcano erupting in isolation in the middles of the Pacific ocean 5. An avalanche in a ski resort 6. An avalanche high on the mountain slopes remote from any settlement 7. A tsunami wave 50cm high off the coast of Japan

8. An earthquake in Kashmir, Northern Pakistan 9. A drought in Australias outback 10. A landslide in a favela in Rio Na-tech or quasi-natural hazards- where natural hazards trigger a technological hazard eg flooding causes a dam to burst Techno hazards technological hazards such as Chernobyl power plant exploding Chronic hazards such as global warming and el-nino/la

nina may increase the threat of other environmental hazards eg sea level rise increases the risk of coastal floods Super hazards catastrophic Earth changes from super volcanoes, tsunamis and asteroid strikes Context hazards widespread (global) threat due to environmental factors such as climate change or a super volcano. Environmental and context hazards

Hazards: Key Terms Disasters: are the realisation of the hazard to cause social impacts such as loss of livelihoods, lives and economic impact such as damage to goods and property. It especially occurs in areas where environments and people are vulnerable. Vulnerability: is a high risk combined with

an inability of individuals and communities to cope. How a hazard becomes a disaster Dreggs model Dreggs model shows how some kind of overlap is needed for a hazard to become a disaster. A disaster is a matter of scale it is simply bigger than a natural hazard.

In 1990 Swiss Re insurance defined a disaster as an event that where at least 20 people died, or insured damage of over 16 million US dollars was caused. But values and currencies change all the time! It depends on how vulnerable the people are that are exposed to it. More of the worlds population are living in areas where they are exposed to hazards eg Bangladesh ( to floods and cyclones), favelas in Brazil (to landslides) The greater the scale of the natural hazard and the more exposed the people are, the greater the disaster

is likely to be. How a disaster becomes a hazard (Philip Allan) Hazards: Vulnerability Shaped by underlying state of human development, includes inequalities in income, opportunity and political power. Poverty stricken people often depend upon

the land for food, live in poor eco-systems and have poor health. The result of this is that high risk is combined with inability to cope with the adverse impact of natural hazards and climate change. Hazards: Natural Hazard or Disaster? Hazard

Disaster A natural disaster is The actual or the effect of a natural hazard (e.g., flood, torn ado, hurricane, volcanic eruption, earthquake, or landslide). It leads to

financial, environmental or human losses. The resulting loss depends on the vulnerability of the affected population to resist the hazard, also called their resilience potential interaction between extreme natural events and

human activities that may result in damage, disruption, death or injury Risk Risk is the exposure of people to a hazardous event and the process of establishing the probability that a hazard event of a particular magnitude will occur within a given period. The types of risk in order of reduced severity are:

Hazards to people death, severe injury, disease, stress Hazards to goods economic losses, infrastructure damage, property damage Hazards to environment pollution, loss of flora and fauna, loss of amenity Exposure to a hazard is not always avoidable. People may place themselves at risk! See p. 5 Philip Allan Risk: why do people remain

exposed to hazards? UNPREDICTABILITY:

Not always predictable when or where an event will take place. Also difficult to know the likely magnitude of the event. Human activity and physical changes also mean that for example sea level is rising giving a greater chance of lowlands flooding. Moreover deforestation of drainage basins increase the frequency and magnitude of flooding. LACK OF ALTERNATIVES: Difficult to uproot and move to another location giving up homes, land and employment. Often the worlds most vulnerable are the poor who are forced to live on unsafe floodplains or steep hillsides. CHANGING LEVELS OF RISK:

Deforestation can make an area once safe from flooding more susceptible. As can the effects of global warming eg sea level rise RUSSIAN ROULETTE: Optimism, turning a blind eye, acts of god, part of the living process. People are comforted by the statistics which show that the risk of death is lower than that from influenza or car accidents. They also believe that if a high magnitude event occurs then it may be safe for a few years, this is not always true. COST V. BENEFIT: Many hazardous areas offer advantages that in peoples minds outweigh the risk. Flood plains for example have very fertile soils and

rich volcanic soils are also attractive. The risk perception process Vulnerability quadrant (Philip Allan) Hazards: Measuring Risk (p 7 Philip Allan and p 12 Pearson) Frequency or magnitude of hazard (H) x

vulnerability (V) Risk (R)= Capacity to cope or adapt (C) The risks are getting worse in some countries because: 1. the frequency is increasing with climate change. 2. Vulnerability is increasing as a result of unsustainable development leading to poor land use and environmental degradation. 3. The capacity to cope is decreasing owing to poverty

and urbanisation. Risks are lower in more developed countries because they have resources and technology to provide protection. A year of wild weather:2011 or 2010 1. Redo the hazards diary case study, updating it for either 2011 or 2010. You should try to extend the columns to include geophysical

hazards, and if you want the higher grades, Natech, techno and chronic hazards as well. 2. Overall whats the worst hazard and why? 3. Crucially, make sure you include the basic impacts and death tolls if appropriate to help back-up your point for the previous question. You can then refer to these in preparation for the June exams. Use the case study example (p11 Philip Allan) as a guide for what you need to do

here. MunichRe Reports will help you, as will bits of other research on the BBC News website (e.g. type in volcano / earthquake etc), or GoogleNews.

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