Managing and reducing tectonic hazards: prediction and monitoring, protection through building design and planning, preparation and education, the immediate and long-term responses to an event, and the evaluation of these strategies.

What this dot point is asking

This is part of Eduqas GCSE Geography A (C111) Theme 3, Tectonic Landscapes and Hazards, the optional theme in Component 1. Eduqas expects you to know how the risk from tectonic hazards is reduced through prediction and monitoring, protection (building design and planning), preparation and education, and the immediate and long-term responses to an event, and to evaluate how effective these strategies are.

Prediction and monitoring

Knowing when and where a hazard might strike buys time.

• Volcanoes can often be predicted: scientists monitor small earthquakes, escaping gases, ground tilt and bulging (with seismometers, gas sensors and GPS), so an eruption can be forecast and people evacuated in time.
• Earthquakes still cannot be reliably predicted, though scientists map fault lines and probabilities. Some places have early-warning systems that detect the first seismic waves and send an alert seconds before the destructive waves arrive (Japan, Mexico), enough to stop trains and warn people.

Protection

Protection means designing the built environment to survive a hazard.

• Earthquake-proof buildings use deep, reinforced foundations, a flexible steel frame that sways without collapsing, base isolators and cross-bracing to absorb the shaking, and automatic gas shut-off valves to prevent fire.
• Tsunami walls and offshore barriers reduce the reach of a tsunami (Japan).
• Land-use planning keeps important buildings and dense housing away from the most dangerous zones (fault lines, lava paths, low coasts).

Preparation and education

Preparation is often the cheapest and most effective approach.

• Education and drills: people who know what to do ("drop, cover, hold on", evacuation routes) survive far more often. Japan holds regular drills.
• Emergency kits and plans help families cope in the first hours.
• Warning systems (sirens, phone alerts) give people time to act.

Responses to an event

When a hazard strikes, the response has two stages.

• Immediate (short-term) responses: search and rescue, emergency medical care, temporary shelter, food, water and aid, and restoring power and communications.
• Long-term responses: rebuilding homes and infrastructure, repairing the economy, improving building codes and defences, and planning to reduce future risk.

Richer countries respond faster and better because they have the money, equipment and organisation; poorer countries often rely on international aid.

Evaluating the strategies

To evaluate, weigh each strategy's strengths and weaknesses and judge by cost and effectiveness.

• Prediction works for volcanoes but not earthquakes.
• Protection saves lives but is expensive, so poorer countries cannot always afford it.
• Preparation is cheap and effective but needs ongoing commitment.
• Response matters most where prevention failed.

The best answer concludes that a combination works best, and that effectiveness depends heavily on a country's level of development.

Try this

Q1. Explain how a volcanic eruption can be predicted. [4 marks]

• Cue. Scientists monitor small earthquakes, escaping gases and ground bulging with seismometers, gas sensors and GPS, so they can forecast an eruption and evacuate people.

Q2. Explain the difference between immediate and long-term responses to an earthquake. [4 marks]

• Cue. Immediate responses are search and rescue, shelter and aid in the first hours and days; long-term responses are rebuilding, repairing infrastructure and improving defences over months and years.