3.7 - Reasons People Live in Areas at Risk
The global distribution of high-risk areas and population densities
Natural hazards like earthquakes and tropical cyclones pose significant threats in specific regions worldwide, often overlapping with areas of high population density. Historical data and mapping reveal that many large cities, with populations exceeding one million, are situated in zones prone to these devastating events. Between 2005 and 2015, it is estimated that around 750,000 people lost their lives to earthquakes alone, highlighting the scale of risk in these densely populated regions.
Overlap between hazard zones and urban centres
- Concentration of cities - Major urban areas are clustered in regions such as Eastern North America, Western Europe, the Indian subcontinent, and East Asia, often aligning with high-risk zones for earthquakes and tropical cyclones.
- Population exposure - Billions of individuals reside in earthquake-prone areas, increasing the potential for casualties and damage when disasters strike.
- Historical growth - Many of these cities have developed over centuries, embedding deep-rooted communities in locations now recognised as hazardous.
Social and economic reasons for residing in hazardous zones
Despite the known dangers, numerous factors influence why people continue to live and work in areas susceptible to natural hazards. These reasons often intertwine social, economic, and psychological elements, reflecting both necessity and choice.
Factors influencing decisions to stay in high-risk areas
- Lack of awareness - In some less developed regions, limited education or access to information means residents may not fully understand the risks, especially if hazards occur infrequently.
- Attractive benefits - Certain areas offer advantages, such as employment opportunities or cultural significance, that outweigh perceived dangers.
- Financial constraints - Many individuals lack the resources to relocate, or fear they won't secure employment elsewhere if they move.
- Optimism or resignation - Some people believe they will never be affected by a disaster, while others accept the risks as an unavoidable part of life.
- Historical and familial ties - High-risk areas are often home to generations of families, where personal connections, community networks, and a sense of belonging create a strong attachment to the location.
- Investment in infrastructure - Cities in these zones represent significant financial and human investment over centuries, making abandonment economically unfeasible for societies.
Specific benefits of living near volcanoes
While volcanoes are among the natural hazards that can cause destruction, they also provide unique advantages that attract populations to settle in their vicinity. These benefits often relate to the natural resources and economic opportunities they create.
Advantages of volcanic regions
- Rich mineral deposits - Volcanic activity brings valuable resources like gold, silver, and copper to the surface, supporting mining industries.
- Fertile agricultural land - Ash from eruptions often enriches the soil with minerals, acting as a natural fertiliser that boosts crop yields.
- Geothermal energy resources - Heat from volcanic rock warms underground water, which can be harnessed as hot springs to provide energy for heating homes and businesses.
- Tourism potential - Iconic volcanoes, such as Mount Etna in Italy, draw millions of visitors annually, boosting local economies through tourism and related services like hot spring resorts.
Advantages of inhabiting flood-prone river valleys and deltas
River valleys and deltas, despite their vulnerability to frequent and severe flooding, support dense populations due to the significant benefits they offer. These areas are critical for agriculture and settlement in many parts of the world.
Benefits of flood-prone regions
- Nutrient-rich soils - Regular flooding deposits silt that replenishes soil fertility, making these areas ideal for farming and sustaining large agricultural communities.
- Population density example - The Nile Delta in Egypt, home to over 40 million people, exemplifies how flood-prone zones support vast populations through fertile land for food production.
- Economic and cultural hubs - These regions often develop into centres of trade and culture due to their strategic location and resources, further embedding communities despite the risks.