Why do people continue to live near volcanoes and fault lines?

People stay for clear benefits: volcanic ash weathers into very fertile soil that is excellent for farming, volcanic areas offer geothermal energy and valuable minerals, dramatic scenery attracts tourists and creates jobs, and many people have family, homes and work ties they cannot easily leave. Some also trust that monitoring, warnings and earthquake-resistant building will keep them safe. The benefits and ties often outweigh a risk that may only occur rarely.

Why does a similar earthquake kill far more people in a poorer country?

Impacts depend on vulnerability, not just hazard strength. Poorer places often have weaker, non-reinforced buildings that collapse, less money for monitoring and warning systems, fewer trained emergency services, poorer roads and hospitals that slow rescue, and densely packed populations. Richer places can afford earthquake-resistant buildings, early warning, drills and rapid rescue, so a hazard of the same magnitude causes fewer deaths. Wealth, preparation and population density explain most of the difference.

How is this topic assessed at N(A)-Level?

It is assessed through compulsory structured, data-response questions, often using a photograph, news extract, map or data table about a real hazard event. Lower-tariff parts ask you to describe impacts or define terms such as primary and secondary effects, while a 6-mark part usually asks you to explain, for example why people stay near hazards or why impacts differ between a rich and a poor country. Use clear reasons and a named example where one is asked for.

SingaporeGeography

Living with Tectonic Hazards overview for N(A)-Level Geography (SEAB 2246): the impacts of earthquakes and eruptions, why people live near hazards, how communities prepare and respond, and why impacts differ between places

Q: What does Living with Tectonic Hazards cover in N(A)-Level Geography?

Living with Tectonic Hazards is a physical geography theme in the Singapore-Cambridge GCE N(A)-Level Geography syllabus (SEAB 2246). It covers the social, economic and environmental impacts of earthquakes and volcanic eruptions, the difference between primary and secondary effects, why people continue to live in risky areas, how communities prepare for and respond to hazards, and why the same strength of hazard causes very different harm in different places. The link between wealth, preparation and the level of harm is central.

Q: What is the difference between primary and secondary effects of a hazard?

Primary effects are the direct, immediate results of the hazard itself, such as buildings collapsing and people killed by falling debris during the shaking. Secondary effects happen afterwards as a knock-on consequence, such as fires from broken gas pipes, disease from contaminated water, landslides, tsunamis or homelessness. A common error is to call a fire or a tsunami a primary effect; if it follows on from the first damage, it is secondary. Always label each effect clearly.

An N(A)-Level Geography (SEAB 2246) overview of Living with Tectonic Hazards: the social, economic and environmental impacts of earthquakes and eruptions, the difference between primary and secondary effects, why people stay near hazards, how communities prepare and respond, and why a similar hazard harms one place far more than another, with links to every dot point and a worked walkthrough.

Generated by Claude Opus 4.86 min readSEAB-2246Updated 2026-06-13

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

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What this topic demands
The impacts of tectonic hazards
Why people live near hazards
Preparing for and responding to hazards
Why impacts differ between places
Worked example: comparing two earthquakes
Check your knowledge

What this topic demands

Living with Tectonic Hazards builds directly on Plate Tectonics: now that you know how earthquakes and eruptions happen, this theme asks what they do to people and why people accept the risk. In the N(A)-Level Geography syllabus (SEAB 2246) the marks come from organising impacts clearly (social, economic, environmental, and primary versus secondary), and from explaining human decisions and outcomes rather than just listing them.

This guide ties together the matching dot-point pages, each with its own practice. See the full set at /sg-n-level/geography/syllabus and the subject hub at /sg-n-level/geography.

The impacts of tectonic hazards

The impacts of tectonic hazards are best organised in two ways at once. First by type: social (deaths, injuries, homelessness), economic (destroyed buildings, lost jobs, costly rebuilding) and environmental (landslides, ground cracks, ash covering farmland). Second by timing: primary effects are the direct, immediate results (collapsed buildings, people killed by debris), while secondary effects are the knock-on consequences that follow (fires from broken gas pipes, tsunamis, disease from dirty water, food shortages). Always label which kind of effect you mean, because examiners reward the distinction.

Why people live near hazards

It can seem strange to live beside a volcano or a fault, but the reasons people stay are strong. Volcanic ash weathers into very fertile soil, so farming is productive. Volcanic regions offer geothermal energy and valuable minerals, and their dramatic scenery draws tourists, creating jobs and income. Many people also have deep family, home and work ties, and cannot afford to move. Others trust that monitoring, warnings and safer building will protect them, especially where major eruptions or quakes are rare.

Preparing for and responding to hazards

Communities cannot stop tectonic hazards, but they can reduce the harm. Preparing for and responding to hazards means prediction and monitoring (seismometers, gas and bulge sensors on volcanoes), early-warning systems (including tsunami warnings), earthquake-resistant building design (flexible frames, deep foundations, cross-bracing), land-use planning to keep building away from the highest-risk ground, and education and drills so people know what to do. After an event, response moves from immediate rescue and aid to longer-term recovery and rebuilding.

Why impacts differ between places

The same magnitude of hazard can kill hundreds in one country and tens of thousands in another. Comparing hazard impacts in different places shows that the difference is vulnerability, not just hazard strength. Richer places can afford earthquake-resistant buildings, monitoring, warnings, drills and rapid rescue; poorer places often have weak buildings, fewer resources, poorer roads and hospitals, and densely packed populations. Wealth, level of preparation and population density together explain most of the gap in deaths and damage.

Worked example: comparing two earthquakes

Worked example

A data table shows two earthquakes of magnitude 7.0. In a richer country there were 60 deaths; in a poorer country there were 30,000 deaths. Using the data, explain why the number of deaths was so different. [6 marks]

Step 1: Read the data and frame the contrast

Both quakes were magnitude 7.0, so the hazard strength was the same. The huge gap in deaths (60 against 30,000) must be caused by differences in vulnerability and preparation, not by the earthquake itself.

Step 2: Explain building quality

In the richer country, buildings were more likely to be earthquake-resistant, with reinforced frames and good foundations, so they swayed instead of collapsing. In the poorer country, many buildings were weak, unreinforced and poorly built, so they collapsed onto people, the main cause of deaths.

Step 3: Explain preparation and emergency response

The richer country could afford monitoring, warning systems, regular drills and well-equipped emergency services, so people knew what to do and rescue was fast. The poorer country had fewer resources, poorer roads and hospitals, so trapped and injured people could not be reached or treated in time, raising the death toll.

Step 4: Add population and conclude

Dense, crowded housing in the poorer country also meant more people were exposed when buildings fell. Conclude that because the magnitude was identical, the difference in deaths is explained by wealth, building quality, preparation and population density, in other words by vulnerability rather than the hazard itself. Using the figures and giving clear reasons earns full marks.

Check your knowledge

Attempt these under timed conditions, then check the matching dot-point pages.

Explain the difference between a primary and a secondary effect, with one example of each. (3 marks)
Describe two economic impacts of a major earthquake. (2 marks)
Explain three reasons why people continue to live near volcanoes. (3 marks)
Describe two ways a country can prepare for earthquakes to save lives. (2 marks)
Explain why a similar earthquake kills far more people in a poorer country. (4 marks)
State two parts of an effective early-warning and response plan. (2 marks)

Sources & how we know this

Singapore-Cambridge GCE Normal (Academic) Level Geography (Syllabus 2246) — Singapore Examinations and Assessment Board (2026)