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Why does a similar earthquake cause far more harm in one place than in another?

Explain why the impacts of tectonic hazards differ between richer and poorer places, using factors such as wealth, preparation and population

A clear, scaffolded answer to the N(A)-Level Geography outcome on why hazard impacts differ. How wealth, preparation, building quality, population density and the speed of help shape the harm a tectonic hazard causes.

Generated by Claude Opus 4.88 min answer

Reviewed by: AI editorial process; not yet individually human-reviewed

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  1. What this dot point is asking
  2. The answer
  3. Examples in context
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What this dot point is asking

This outcome asks you to explain why two hazards of similar strength can cause very different amounts of harm in different places. The central idea is that a hazard's impact depends not just on its size but on how vulnerable the place is, and that wealth, preparation, population and the nature of the event all shape the outcome.

The answer

Wealth and development

The biggest factor is often how rich and developed a place is. A wealthier place can afford earthquake-resistant buildings, warning systems, drills and well-funded emergency services, so it suffers far fewer deaths. A poorer place often has weak, poorly built homes that collapse easily, little money for preparation, and limited, slow emergency and medical care, so the same hazard kills far more people.

Building quality

Building quality is closely linked to wealth. Strong, well-designed buildings stay standing and protect the people inside, while weak, poorly built structures collapse and crush people. Most earthquake deaths are caused by collapsing buildings, so this factor is crucial.

Preparation and warning

Places that prepare suffer less. Education, drills, warning systems and emergency planning mean people react quickly and help arrives fast. Places with little preparation are caught off guard, and the lack of warning and slow response increase the death toll.

Population density

The number of people and buildings in the area matters. A densely populated city has many people close together, so the same hazard affects far more of them than it would in a thinly populated rural area. High density raises the potential for harm.

The nature of the event

Some events are simply more harmful. An earthquake at night, when people are asleep indoors, causes more deaths than one in the open in daytime. A hazard that triggers a secondary event such as a tsunami or landslide, or that strikes on soft ground near the epicentre, also causes far greater harm.

Examples in context

Example 1. Contrasting earthquake death tolls. Earthquakes of similar magnitude have caused vastly different death tolls: a powerful quake striking a wealthy, well-prepared country like Japan may cause far fewer deaths than a comparable one in a poorer country with weak buildings and limited emergency services. The difference reflects vulnerability, not just the size of the quake.

Example 2. Why dense cities are at greater risk. A densely populated city sitting on or near a plate boundary faces a higher potential death toll than a thinly populated rural region, because so many people and buildings are concentrated together. This is one reason large cities invest heavily in resistant building and drills to reduce their vulnerability.

Try this

Q1. State one reason why poorer places often suffer more deaths from earthquakes. [1 mark]

  • Cue. Weak, poorly built buildings that collapse easily (also limited preparation and slow emergency services).

Q2. Explain how population density affects the impact of a hazard. [2 marks]

  • Cue. A densely populated area has more people and buildings close together, so the same hazard affects far more people than in a thinly populated area.

Q3. Explain why an earthquake at night may cause more deaths than one in the daytime. [2 marks]

  • Cue. At night people are asleep indoors, so they are trapped when buildings collapse and have less chance to react or escape.

Exam-style practice questions

Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Original6 marksTwo earthquakes of similar strength strike a rich country and a poor country. The poor country suffers far more deaths. Explain why the impacts are so different.
Show worked answer →

In a poorer country, buildings are often weak and poorly built, so they collapse easily and crush people. There is less money for preparation, fewer drills and warning systems, and emergency services and medical care are limited and slow to arrive, so more injured people die.

In a richer country, buildings are designed to resist shaking, people are educated and practise drills, and well-funded emergency services respond quickly with rescue and medical care. So a similar earthquake causes far fewer deaths.

What markers reward: a clear contrast in building quality, preparation (drills, warnings) and the speed and quality of emergency response, all linked to wealth and development.

Original5 marksApart from wealth, explain two other factors that affect how badly a place is harmed by an earthquake.
Show worked answer →

Factor one: population density. A densely populated city has more people and buildings close together, so the same earthquake affects far more people than it would in a thinly populated rural area.

Factor two: the time of day and the nature of the event. An earthquake at night, when people are asleep indoors, or one that triggers a secondary hazard such as a tsunami or landslide, causes far more harm than one in the open in daytime.

What markers reward: two genuine non-wealth factors (population density, time of day, secondary hazards, distance from the epicentre, ground type), each explained with how it changes the harm.

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