Types of Disaster — Natural and Man-Made with Examples

A disaster is a serious disruption of the functioning of a community or society involving widespread human, material, economic, or environmental losses and impacts, which exceed the ability of the affected community or society to cope using its own resources.

Key Characteristics of a Disaster: • Sudden or slow onset event that overwhelms normal coping capacity. • Causes loss of life, injuries, property damage, and economic disruption. • Requires external assistance for recovery.

Disasters vs. Hazards: A hazard is a potentially dangerous phenomenon (e.g., an earthquake fault, a volcano). A disaster occurs when a hazard affects a vulnerable community and causes significant losses. The same earthquake may cause a disaster in a poorly built settlement but minimal damage in a well-built city.

India's Vulnerability: India is among the world's most disaster-prone nations. About 85% of India's land area is vulnerable to one or more disaster types. Causes include its diverse geography (Himalayas, coastlines, river plains), high population density, and varying climatic conditions.

Natural disasters are caused by natural processes or phenomena of the Earth. They include:

1. Earthquake: • Caused by movement of tectonic plates releasing energy as seismic waves. • India's vulnerable zones: Himalayan region (Zone V), North-East India, parts of Gujarat and Maharashtra. • Major events: 2001 Bhuj earthquake (Gujarat), 1905 Kangra earthquake. • India is divided into 5 seismic zones (Zone II to Zone V); Zone V is most dangerous.

2. Flood: • Most common disaster in India. Caused by heavy rainfall, overflowing rivers, and inadequate drainage. • Most affected states: Assam, Bihar, Uttar Pradesh, West Bengal (Brahmaputra and Ganga river systems). • Approximately 40 million hectares of India's land is flood-prone.

3. Cyclone: • Intense tropical storms with high-speed rotating winds and heavy rain. • India's cyclone-prone coasts: East coast (Bay of Bengal) is more prone than the west coast (Arabian Sea). • Major events: Cyclone Fani (Odisha, 2019), Cyclone Amphan (West Bengal, 2020). • India Meteorological Department (IMD) tracks and issues warnings.

4. Tsunami: • Giant ocean waves caused by underwater earthquakes, volcanic eruptions, or landslides. • Major event: 2004 Indian Ocean Tsunami — deadliest in recorded history; killed over 2 lakh people; severely affected Tamil Nadu, Andhra Pradesh, and Andaman Islands in India. • India now has the Indian Tsunami Early Warning Centre (ITEWC) at Hyderabad.

5. Drought: • Prolonged shortage of rainfall leading to water scarcity and crop failure. • India has semi-arid regions (Rajasthan, parts of Maharashtra, Karnataka) that are highly drought-prone. • Two types: Meteorological drought (deficient rainfall) and Agricultural drought (insufficient soil moisture for crops).

6. Landslide: • Sudden movement of soil and rock down a slope, often triggered by rain or earthquakes. • Most affected regions: Himalayan states (Uttarakhand, Himachal Pradesh, North-East India), Western Ghats. • Major event: 2013 Kedarnath disaster (combined flood and landslide).

7. Heatwave and Cold Wave: • Heatwaves: Prolonged periods of abnormally high temperatures; common in Rajasthan, Odisha, Andhra Pradesh. • Cold waves: Extreme cold spells; common in North India (Delhi, UP, Bihar) in winter.

Man-made disasters are caused directly or indirectly by human actions, negligence, or conflict. They include:

1. Industrial Accidents: • Caused by accidents in factories, chemical plants, or mines releasing toxic substances. • Major example: 1984 Bhopal Gas Tragedy — methyl isocyanate (MIC) gas leaked from the Union Carbide plant; killed thousands and affected lakhs; considered the world's worst industrial disaster. • Other examples: Factory fires, mining accidents, oil spills.

2. Nuclear/Radiological Accidents: • Release of radioactive material from nuclear facilities. • Global example: 1986 Chernobyl disaster (USSR), 2011 Fukushima disaster (Japan). • India's nuclear plants are regulated by the Atomic Energy Regulatory Board (AERB).

3. Fire: • Large-scale fires in buildings, forests, or industrial facilities. • Forest fires are a growing problem in Uttarakhand, Himachal Pradesh, and North-East India. • Urban fires in markets, high-rises, and slums cause significant losses.

4. Road, Rail, and Air Accidents: • Large-scale transportation accidents can have disaster-level impacts. • India has one of the world's highest road accident rates.

5. Terrorism and Conflict: • Deliberate acts of violence targeting civilians or infrastructure. • Examples: Bomb blasts, biological or chemical attacks.

6. Environmental Degradation: • Gradual man-made disasters: Deforestation leading to flooding, over-extraction of groundwater causing land subsidence, pollution of rivers and air.

7. Epidemics and Pandemics: • Rapid spread of infectious disease can be classified as a biological disaster. • COVID-19 pandemic (2020–21) is a recent global example.

The National Disaster Response Force (NDRF) is the primary agency in India for specialised response to disasters.

Key Facts about NDRF: • Established under the Disaster Management Act, 2005. • Has 16 battalions stationed at various locations across India. • Each battalion has 1,149 personnel trained in search, rescue, and relief operations. • Equipped to handle natural disasters (floods, earthquakes, cyclones) and man-made disasters (CBRN — Chemical, Biological, Radiological, and Nuclear incidents).

NDRF's Notable Operations: • Cyclone Fani (Odisha, 2019): Pre-positioned teams enabled rapid evacuation of over 1.2 million people. • 2015 Nepal Earthquake: NDRF was among the first foreign rescue teams to reach Nepal. • COVID-19 pandemic: Assisted in awareness campaigns and rescue operations.

Difference between NDRF and SDRF: • NDRF = National Disaster Response Force (central government, highly specialised). • SDRF = State Disaster Response Force (state government, first-responders for state-level disasters).

India's Geography and Disaster Vulnerability: • Himalayan Region: Prone to earthquakes, landslides, and flash floods. • Indo-Gangetic Plain: Prone to floods and droughts. • Coastal Areas (7,516 km coastline): Prone to cyclones, storm surges, and tsunamis. • Peninsular India: Prone to droughts and heatwaves. • North-East India: Highly prone to earthquakes and floods.

Key Statistics: • About 85% of India's land area is vulnerable to one or more hazards. • Approximately 57% of India is prone to earthquakes (moderate to very high risk). • About 40 million hectares of land is flood-prone. • 76% of India's coastline is prone to cyclones and tsunamis.

Institutional Framework: • NDMA (National Disaster Management Authority): Apex policy body. • NDRF (National Disaster Response Force): Operational response force. • IMD (India Meteorological Department): Weather and cyclone early warnings. • INCOIS (Indian National Centre for Ocean Information Services): Tsunami early warning. • State and District Disaster Management Authorities: State and local implementation.