G3: Tectonic Hazards: Effects and Responses
Understanding the primary and secondary effects of tectonic hazards, immediate and long-term responses, and how impacts differ between LICs and HICs.
📋 Primary and Secondary Effects
Primary effects are the direct results of the tectonic hazard itself — they happen immediately as a direct consequence of the earthquake or volcanic eruption.
Secondary effects happen as a consequence of the primary effects, often hours, days or even weeks later. They are indirect results of the hazard.
Primary Effects of Earthquakes
- Buildings and bridges collapse
- Roads, railways and infrastructure are damaged or destroyed
- People are killed or injured by falling debris
- Gas pipes rupture, causing fires
- Water and electricity supplies are disrupted
Secondary Effects of Earthquakes
- Fires from ruptured gas mains spread through collapsed areas
- Tsunamis triggered by underwater earthquakes
- Landslides and liquefaction of soil
- Disease from contaminated water and lack of sanitation
- Homelessness and displacement of populations
- Shortage of food and clean water
- Economic losses from business disruption
Primary Effects of Volcanic Eruptions
- Lava flows destroy buildings, farmland and roads
- Pyroclastic flows (fast-moving clouds of hot gas, ash and rock) kill people and destroy everything in their path
- Volcanic ash buries buildings and crops
- Volcanic bombs (large rocks ejected from the volcano) cause damage and injury
- People and livestock are killed or injured
Secondary Effects of Volcanic Eruptions
- Ash clouds disrupt air travel (e.g. 2010 Eyjafjallajökull eruption closed European airspace)
- Mudflows (lahars) from ash mixed with rain or melted ice
- Crop failure and food shortages from ash covering farmland
- Flooding when volcanic material blocks rivers
- Climate change from volcanic gases and ash reflecting sunlight
- Economic losses from tourism decline and transport disruption
🚑 Immediate and Long-term Responses
Immediate responses are the actions taken in the hours and days immediately after the disaster to save lives and provide basic needs.
Long-term responses are the actions taken in the weeks, months and years after the disaster to rebuild and recover, and to reduce the impact of future events.
| Type | Immediate Responses | Long-term Responses |
|---|---|---|
| Rescue | Search and rescue teams; emergency shelters | Rebuilding homes and infrastructure |
| Medical | First aid; field hospitals; emergency medical supplies | Rebuilding hospitals; mental health support |
| Essential supplies | Food, water, blankets distributed by aid agencies | Restoring water and electricity supplies permanently |
| Infrastructure | Temporary repairs to roads and bridges | Complete rebuilding with improved building codes |
| Financial | Emergency aid from governments and NGOs | International loans; investment in recovery; insurance payouts |
| Planning | Evacuation; establishing emergency coordination | Improved monitoring; updated emergency plans; education programmes |
⚖️ LIC vs HIC Comparison: Earthquake Case Studies
Case Study: 2010 Haiti Earthquake (LIC)
Haiti Earthquake — 12 January 2010
Magnitude: 7.0 on the Richter scale
Depth: 13 km (shallow focus — more destructive at surface)
Location: 25 km west of Port-au-Prince, the capital city
Plate margin: Conservative boundary between the Caribbean Plate and the North American Plate (similar to the San Andreas Fault)
Primary effects:
- Approximately 220,000 people killed
- 300,000 people injured
- 250,000 homes and 30,000 commercial buildings collapsed
- Government buildings, hospitals and the presidential palace destroyed
- Major roads blocked by rubble and landslides
Secondary effects:
- 1.5 million people made homeless, living in temporary camps
- Cholera outbreak in October 2010 — killed over 8,000 people (introduced by UN peacekeepers)
- Looting and violence in the aftermath
- 90% of Port-au-Prince's buildings were damaged or destroyed
- Estimated $8 billion in economic damage (120% of Haiti's GDP)
Immediate responses:
- International search and rescue teams arrived within 24–48 hours
- Medical charities (e.g. Médecins Sans Frontières) set up field hospitals
- Emergency aid: food, water, medicine and temporary shelters distributed
- Over 1,000 camps set up for displaced people
- The US sent 10,000 troops to help with relief efforts
Long-term responses:
- Reconstruction was extremely slow — 5 years later, many people still lived in camps
- $9 billion pledged in international aid, but much was not delivered or was mismanaged
- Some buildings rebuilt with improved construction techniques
- Early warning systems and evacuation plans still lacking
- Millions spent on cholera treatment and prevention
Case Study: 2011 Tōhoku Earthquake, Japan (HIC)
Tōhoku Earthquake and Tsunami — 11 March 2011
Magnitude: 9.0 on the Richter scale (the most powerful ever recorded in Japan)
Depth: 32 km
Location: 70 km east of the Tōhoku region, off the Pacific coast
Plate margin: Destructive boundary — Pacific Plate subducting under the Eurasian Plate
Tsunami: Waves up to 40 m high reached the coast within 30 minutes
Primary effects:
- Approximately 20,000 people killed or missing (mostly from the tsunami)
- Over 120,000 buildings destroyed
- 260,000 people evacuated from their homes
- Fukushima Daiichi nuclear power plant damaged — meltdown and radiation leaks
- Coastal towns and villages completely destroyed by tsunami waves
Secondary effects:
- Fukushima nuclear disaster — 150,000 people evacuated from exclusion zone; radioactive contamination of land and sea
- Estimated $235 billion in economic damage (the costliest natural disaster in history)
- Energy shortages due to nuclear power shutdowns
- Global supply chain disruption — factories worldwide affected by parts shortages
- Psychological trauma for survivors
Immediate responses:
- Japan's earthquake early warning system sent alerts to millions of phones seconds before the quake
- 100,000 members of the Japanese Self-Defence Forces mobilised for rescue and relief
- Tsunami warnings issued across the Pacific within minutes
- Emergency shelters opened in schools and public buildings
- International aid teams and supplies sent by over 100 countries
Long-term responses:
- Seawalls and flood barriers rebuilt to higher standards (some exceeded 10 m, but tsunami overtopped them)
- Decommissioning of the Fukushima plant — estimated to take 30–40 years
- Coastal towns rebuilt on higher ground
- Improved tsunami warning systems and evacuation routes
- Regular evacuation drills for coastal communities
📊 Comparing LIC and HIC Impacts
| Factor | Haiti 2010 (LIC) | Japan 2011 (HIC) |
|---|---|---|
| Magnitude | 7.0 | 9.0 (100× more energy) |
| Deaths | 220,000+ | ~20,000 |
| Building codes | None enforced; buildings collapsed easily | Strict codes; many buildings survived the earthquake |
| Early warning | No system | Advanced system — alerts sent within seconds |
| Rescue | Slow and disorganised; lacked equipment | Rapid, well-organised, 100,000+ military personnel |
| Infrastructure | Already poor; recovery took years | Advanced; quickly repaired despite massive damage |
| Aid | Heavy reliance on international aid | Self-sufficient with some international support |
| Recovery | Still incomplete after 5+ years; cholera outbreak | Rapid reconstruction; most areas rebuilt within 5 years |
Key conclusion: The level of economic development has a massive influence on the impact of tectonic hazards. A stronger earthquake in a HIC can kill far fewer people than a weaker one in a LIC, because HICs have better building codes, early warning systems, emergency services, and resources for recovery. However, the economic cost of disasters is usually higher in HICs because infrastructure and property are more valuable.
🌋 Volcanic Eruption Case Study: Eyjafjallajökull 2010
Eyjafjallajökull Eruption, Iceland — April 2010
Type: Composite volcano on a constructive plate margin (Mid-Atlantic Ridge)
Eruption style: Explosive — magma interacted with glacial ice, creating fine ash clouds
Eyjafjallajökull Eruption, Iceland — April 2010
Type: Composite volcano on a constructive plate margin (Mid-Atlantic Ridge)
Eruption style: Explosive — magma interacted with glacial ice, creating fine ash clouds
Primary effects:
- 800 people evacuated from the area around the volcano
- Glacial meltwater caused flash floods (jökulhlaups) — roads and bridges washed away
- Ash plume rose 9 km into the atmosphere
- Farm land covered in thick ash — crops and livestock affected
Secondary effects:
- European airspace closed for 6 days — 10 million passengers affected
- Airlines lost an estimated £130 million per day
- Global supply chains disrupted — Kenyan flower growers lost $1.3 million per day as produce could not be exported
- Tourism initially declined but later increased as people visited to see the eruption
Responses:
- Iceland's Met Office monitored the eruption closely and issued ash cloud forecasts
- European aviation authorities eventually changed rules to allow flying through lower-density ash
- Emergency plans activated for stranded passengers
- Volcanic ash was cleared from farmland and roads
❓ Practice Questions
Q1: Define the terms 'primary effects' and 'secondary effects' of a tectonic hazard. (2 marks)
Q2: Give two primary and two secondary effects of the 2010 Haiti earthquake. (4 marks)
Q3: Explain why the 2010 Haiti earthquake (magnitude 7.0) killed more people than the 2011 Japan earthquake (magnitude 9.0). (6 marks)
Q4: Describe the immediate and long-term responses to a named volcanic eruption. (6 marks)
Q5: Compare the secondary effects of the Haiti and Japan earthquakes. (6 marks)
✅ Answers
- Primary effects are the direct results of the hazard event itself, happening immediately (e.g. buildings collapsing in an earthquake). Secondary effects are indirect consequences that occur later as a result of the primary effects (e.g. disease outbreaks from contaminated water).
- Primary effects of Haiti: (1) 220,000 people killed by collapsing buildings; (2) 250,000 homes and 30,000 commercial buildings collapsed. Secondary effects: (1) Cholera outbreak killed over 8,000 people due to contaminated water; (2) 1.5 million people made homeless, living in temporary camps.
- Despite being a much stronger earthquake, Japan suffered fewer deaths because: (1) Japan has strict building codes that require earthquake-resistant construction, so fewer buildings collapsed; (2) Japan has an advanced early warning system that sent alerts to phones before the quake hit; (3) Japan has well-trained emergency services and military (100,000+ mobilised); (4) Japan's government is well-organised and well-funded for disaster response; (5) Haiti had no building codes, no early warning, poor infrastructure, and a weak government. Most deaths in Japan were caused by the tsunami, not the earthquake itself, which demonstrates the effectiveness of Japan's earthquake-resistant buildings.
- Using the 2010 Eyjafjallajökull eruption: Immediate responses included evacuating 800 people from the area, monitoring the eruption and issuing ash cloud forecasts, and activating emergency plans for stranded air passengers. Long-term responses included changing European aviation rules to allow flying through lower-density ash, clearing volcanic ash from farmland and roads, and recognising the need for better international coordination during volcanic ash events. Tourism later increased as people visited Iceland to see the volcano.
- Both earthquakes produced significant secondary effects but of different types. In Haiti, secondary effects were primarily humanitarian — 1.5 million made homeless, cholera outbreak killing 8,000+, looting and violence, and long-term poverty as reconstruction was very slow. In Japan, secondary effects were primarily economic and technological — the Fukushima nuclear disaster forced 150,000 people from their homes, estimated $235 billion economic damage, global supply chain disruption affecting factories worldwide, and energy shortages from nuclear shutdowns. Japan's secondary effects were more costly but Haiti's were more devastating in terms of human suffering, because Haiti lacked the resources to respond effectively.
🎯 Exam Tips
- Always learn at least one LIC and one HIC earthquake case study — comparison questions are very common
- Make sure you can clearly distinguish between primary and secondary effects — primary = direct/immediate, secondary = indirect/later
- Use specific facts and statistics in your answers (e.g. "220,000 killed in Haiti" not "many people died")
- When comparing LIC and HIC, explain WHY the differences exist (building codes, wealth, technology, governance)
- Remember that economic cost is often HIGHER in HICs even though death tolls are LOWER
- Include both immediate and long-term responses in your answers for full marks
📝 Exam Technique
Tectonic Hazards Effects & Responses Exam Tips:
1. Always structure effects answers as two clear lists: primary effects (direct, immediate) then secondary effects (indirect, later). Mixing them up loses marks — the Haiti cholera outbreak is secondary, not primary.
2. For LIC vs HIC comparison, make direct point-by-point contrasts: 'Haiti had no early warning system, whereas Japan's system sent alerts within seconds' — don't just describe each country separately.
3. Use precise statistics as evidence: '220,000 killed in Haiti' scores higher than 'many people died'. Always link the number to the explanation (poor building codes, dense urban population).
4. When evaluating responses, consider both effectiveness AND limitations: 'Japan's military mobilised 100,000 personnel within hours (effective), but the tsunami overtopped 10 m sea walls, showing that even HIC defences can be overwhelmed (limitation).'
1. Always structure effects answers as two clear lists: primary effects (direct, immediate) then secondary effects (indirect, later). Mixing them up loses marks — the Haiti cholera outbreak is secondary, not primary.
2. For LIC vs HIC comparison, make direct point-by-point contrasts: 'Haiti had no early warning system, whereas Japan's system sent alerts within seconds' — don't just describe each country separately.
3. Use precise statistics as evidence: '220,000 killed in Haiti' scores higher than 'many people died'. Always link the number to the explanation (poor building codes, dense urban population).
4. When evaluating responses, consider both effectiveness AND limitations: 'Japan's military mobilised 100,000 personnel within hours (effective), but the tsunami overtopped 10 m sea walls, showing that even HIC defences can be overwhelmed (limitation).'
⚠️ Common Errors
Watch Out!
Students often think A higher magnitude earthquake always causes more deaths. Wrong: A higher magnitude earthquake always causes more deaths Correct: The 2010 Haiti earthquake (magnitude 7.0) killed 220,000 people, while Japan's 2011 earthquake (magnitude 9.0) killed approximately 20,000. Building quality, population density, emergency preparedness and governance matter more than magnitude alone.
Students often think Economic cost is always higher in LICs because they are more affected. Wrong: Economic cost is always higher in LICs because they are more affected Correct: Economic cost is usually far higher in HICs because infrastructure and property are more valuable. Japan's 2011 disaster cost $235 billion vs Haiti's $8 billion — but Haiti's loss represented 120% of its GDP, making the relative economic impact far worse.
Students often think The Eyjafjallajökull ash cloud was a primary effect. Wrong: The Eyjafjallajökull ash cloud was a primary effect Correct: The ash plume rising 9 km was a primary effect, but the closure of European airspace for 6 days, airline losses of £130 million per day, and Kenyan flower growers losing $1.3 million per day were all secondary effects — they resulted from the ash cloud, not directly from the eruption.
✍️ Model Answer
Full-Mark Response
9 marks: Compare the effects of and responses to tectonic hazards in an LIC and a HIC. Use named case studies.
The 2010 Haiti earthquake (magnitude 7.0, LIC) and the 2011 Tōhoku earthquake and tsunami (magnitude 9.0, HIC) reveal stark contrasts. Primary effects in Haiti included 220,000 deaths and 250,000 homes destroyed by collapsing buildings, whereas Japan suffered 20,000 deaths — mostly from the tsunami, not building collapse, because Japan's strict building codes meant most structures survived the shaking. Secondary effects also contrasted sharply: Haiti experienced a cholera outbreak killing 8,000+, 1.5 million made homeless, and looting; Japan faced the Fukushima nuclear disaster forcing 150,000 from their homes, $235 billion economic damage (the costliest natural disaster in history), and global supply chain disruption. The key contrast is that Haiti's death toll was over 10 times higher despite a far weaker earthquake, while Japan's economic losses were nearly 30 times greater. Immediate responses differed dramatically: Japan's early warning system sent alerts to millions of phones seconds before shaking, 100,000 Self-Defence Forces personnel were mobilised within hours, and tsunami warnings were issued across the Pacific within minutes. In Haiti, there was no early warning, the government was largely ineffective, and international aid took days to organise. Long-term, Japan rebuilt coastal towns on higher ground within 5 years and improved sea defences; Haiti's reconstruction was still incomplete after 5 years, with 60,000 people still in camps and $9 billion in pledged aid largely undelivered or mismanaged. This demonstrates that level of development determines capacity to respond, not the severity of the hazard itself.
Mark scheme: 3 marks for comparing effects with specific data, 3 marks for comparing responses with specific detail, 3 marks for sustained LIC/HIC contrast linked to development
📊 AO Deep Dive
Assessment Objective Analysis
AO1 (Knowledge): Know specific primary/secondary effects and immediate/long-term responses for Haiti 2010 and Japan 2011, plus Eyjafjallajökull 2010. AO2 (Understanding): Explain WHY effects and responses differ between LICs and HICs — link building quality, governance, wealth and technology to outcomes. AO3 (Analysis): Compare and evaluate — top marks require point-by-point contrast ('whereas', 'in contrast') rather than describing each case study separately. AO4 (Skills): Interpret data on death tolls, economic losses or seismic readings. Grade 9 answers use the term 'proportionally' when comparing (e.g. Haiti's $8 billion loss was 120% of GDP vs Japan's $235 billion being only 4% of GDP).
📝 Exam Questions by Topic
🎬 Video Resources
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