Nepal Earthquake 2015: GCSE Geography Case Study

What caused the Nepal earthquake?

Nepal lies on one of the world's most geologically active boundaries: the collision zone between the Indo-Australian Plate and the Eurasian Plate. This is a destructive (convergent) plate boundary where the Indo-Australian Plate is being forced northward and under the Eurasian Plate at a rate of approximately 4–5 cm per year. This collision created the Himalayas and produces frequent, powerful earthquakes.

Key facts about the earthquake's cause and characteristics:

The shallow depth (15 km) was a critical factor: shallow earthquakes release their energy close to the surface, producing stronger ground shaking than deeper earthquakes of equal magnitude.

What were the immediate (primary) effects?

Primary effects are the direct consequences of the shaking:

• Deaths and injuries: Approximately 8,964 people killed; 21,952 injured.
• Buildings destroyed: Around 604,000 homes collapsed and 288,000 were damaged — many were traditional stone and mud-brick construction that performs poorly in earthquakes.
• Heritage sites: UNESCO World Heritage Sites in Kathmandu Valley, including the Dharahara tower, were destroyed or severely damaged.
• Avalanches: The earthquake triggered avalanches on Langtang mountain, killing over 250 trekkers and local residents in the valley. Another avalanche at Mount Everest base camp killed 22 people.
• Landslides: Over 5,000 landslides were recorded, blocking roads, burying villages, and damming rivers.
• Economic damage: Total economic losses were estimated at approximately $7 billion — roughly one third of Nepal's annual GDP.

What were the secondary (longer-term) effects?

Secondary effects develop in the hours, days, and weeks following the event:

• Infrastructure collapse: Major roads, bridges, and telecommunications were damaged, severely hampering rescue and relief efforts. Remote mountain communities were cut off for days.
• Landslide dams: Rivers blocked by landslide debris created temporary lakes, which threatened catastrophic flooding when they eventually broke.
• Disease risk: Disrupted water supplies and sanitation, combined with displaced populations in temporary shelters, raised fears of cholera and diarrhoeal disease outbreaks.
• Agricultural disruption: The earthquake struck just before the spring planting season; displacement, destroyed equipment, and damaged terraced fields affected food production for months.
• Tourism collapse: Nepal's crucial trekking and climbing sector was severely disrupted for over a year, costing the economy an estimated $500 million.
• Mental health impacts: Studies estimated that over 400,000 survivors showed signs of post-traumatic stress disorder.

Why did Nepal suffer such severe damage?

Nepal was vulnerable for several interconnected reasons:

1. Low income country (LIC) status: Nepal had a GDP per capita of around $700 in 2015. Investment in earthquake-resistant construction, infrastructure maintenance, and emergency services was limited.
2. Building quality: Many buildings — particularly in rural areas — used unreinforced stone, brick, or adobe construction that collapses readily in earthquakes. Even in Kathmandu, rapid urban growth had led to widespread construction that ignored building codes.
3. Geography: Nepal's rugged Himalayan terrain made rescue and logistics extremely difficult; many affected communities were accessible only on foot.
4. Existing poverty: Rural communities had limited ability to stockpile food, maintain emergency supplies, or recover economically from losses.

How did Nepal and the international community respond?

Immediate (short-term) responses:

• The Nepali Army was deployed within hours for search and rescue.
• Nepal issued an international appeal for assistance; over 60 countries and many international organisations responded with personnel, equipment, and money.
• India, China, and Pakistan sent military transport planes with relief supplies.
• The UN deployed coordination teams to manage the international response.
• Emergency shelter, food, and water were distributed, though remote areas were reached only after several days.

Longer-term reconstruction:

• The National Reconstruction Authority (NRA) was established to manage rebuilding.
• Over $4 billion in international aid was pledged at a donor conference.
• Reconstruction took several years; many families lived in temporary shelters through the monsoon season of 2015.
• Stricter building codes were introduced, with programmes to train local builders in earthquake-resistant techniques.

How does Nepal compare with Japan or New Zealand as an earthquake case study?

Comparing an LIC (like Nepal) with a HIC (like Japan after Tohoku in 2011) reveals the role of development in determining earthquake outcomes.

The comparison shows that hazard and disaster are not the same thing: a smaller earthquake in a poorer country can cause more deaths than a larger earthquake in a richer one.

Frequently asked questions

Why is Nepal particularly at risk from earthquakes?

Nepal sits above one of the world's most active convergent plate boundaries, where the Indo-Australian Plate drives into the Eurasian Plate at 4–5 cm per year. This builds enormous stress in the rock, which is periodically released as earthquakes. The region has experienced many large historical earthquakes, including a devastating one in 1934. The combination of this active geology, steep mountain terrain, dense rural settlement, and limited resources for earthquake-resistant construction makes Nepal structurally vulnerable.

What is liquefaction and did it affect Nepal in 2015?

Liquefaction occurs when earthquake shaking causes water-saturated loose sediment to behave temporarily like a liquid, losing its structural strength and causing buildings above to sink or topple. Liquefaction was observed in parts of the Kathmandu valley during the 2015 earthquake, contributing to foundation failures in some areas. Kathmandu sits on a former lake bed of ancient lake sediments — material that is particularly susceptible to liquefaction when shaken.

How has Nepal used the earthquake to improve future preparedness?

Following 2015, Nepal introduced mandatory earthquake-resistant building codes for new construction and established programmes to train local masons in safer building techniques. Government investment in disaster preparedness, early warning systems, and community-level response training increased. International organisations worked with Nepali partners to retrofit or replace the most vulnerable buildings in Kathmandu. These efforts are ongoing; the Nepali government has acknowledged that much of the remaining housing stock remains vulnerable to a future major earthquake.

Why did some remote communities wait days for aid after the 2015 earthquake?

Nepal's geography is extremely challenging: many communities are connected only by steep mountain paths, with the nearest road hours away. Landslides triggered by the earthquake blocked many roads and paths. Helicopter access was limited by the number of available aircraft and by poor weather in the mountains in the days after the earthquake. The international response was large and well-intentioned but took time to organise and deploy — illustrating why pre-positioned supplies and trained local first responders are so important in reducing post-earthquake mortality.

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