LibraryNatural Disasters: Earthquakes, Floods, Droughts, Cyclones

Natural Disasters: Earthquakes, Floods, Droughts, Cyclones

Learn about Natural Disasters: Earthquakes, Floods, Droughts, Cyclones as part of UPSC Prelims Preparation - General Studies and CSAT

Natural Disasters in Indian Geography for Competitive Exams

Understanding natural disasters is crucial for the UPSC Prelims General Studies and CSAT papers. This module focuses on four major types of natural disasters prevalent in India: Earthquakes, Floods, Droughts, and Cyclones. We will explore their causes, impacts, and mitigation strategies relevant to the Indian context.

Earthquakes

Earthquakes are sudden tremors in the Earth's crust caused by the release of energy, usually due to the movement of tectonic plates. India's geographical location, situated on the Indian tectonic plate, makes it highly susceptible to seismic activity, particularly in the Himalayan region.

Which seismic zone in India is considered the most prone to severe earthquakes?

Zone V

Floods

Floods are the most common natural disaster in India, characterized by the inundation of land that is normally dry. They are primarily caused by heavy rainfall, especially during the monsoon season, but also by overflowing rivers, dam failures, and coastal storm surges.

India's extensive river systems, such as the Ganga, Brahmaputra, and Indus, are prone to severe flooding, especially in their lower courses and deltas. Factors contributing to flood vulnerability include deforestation in catchment areas, encroachment on riverbeds, inadequate drainage systems, and the impact of cyclones. The Brahmaputra river is notorious for its devastating floods, often referred to as the 'Sorrow of Assam'. Coastal areas are also vulnerable to tidal floods and storm surges.

📚

Text-based content

Library pages focus on text content

Flash floods, caused by sudden intense rainfall or dam bursts, can be particularly destructive due to their rapid onset and high water velocity.

Droughts

Droughts are prolonged periods of abnormally low rainfall, leading to a shortage of water. In India, droughts are often linked to the erratic behavior of the monsoon, which is the lifeline of the country's agriculture.

Drought TypeCharacteristicsImpact
Meteorological DroughtDeficiency in rainfall over a specific period.Reduced soil moisture, impact on vegetation.
Agricultural DroughtInsufficient soil moisture to support crop growth.Crop failure, reduced agricultural output, food insecurity.
Hydrological DroughtReduced surface and subsurface water supplies (rivers, lakes, groundwater).Water scarcity for drinking, irrigation, and industrial use.
Socio-economic DroughtImpact of drought on human activities and economic systems.Food shortages, economic losses, migration, social unrest.

Regions like the semi-arid areas of Rajasthan, Gujarat, and parts of Maharashtra are particularly vulnerable to recurrent droughts. The impact extends beyond agriculture, affecting water availability for domestic use, industry, and power generation.

Cyclones

Cyclones, also known as tropical storms, are intense low-pressure systems that form over warm ocean waters. They are characterized by strong winds, heavy rainfall, and storm surges, posing a significant threat to India's long coastline.

Which ocean basin is more prone to cyclones affecting India?

The Bay of Bengal

Mitigation and Preparedness

Effective disaster management involves a multi-pronged approach, including early warning systems, infrastructure development (e.g., flood control measures, earthquake-resistant buildings), public awareness campaigns, and robust response mechanisms. Understanding the specific vulnerabilities of different regions in India is key to developing targeted mitigation strategies.

Learning Resources

National Disaster Management Authority (NDMA) - India(documentation)

The official website of India's apex body for disaster management, providing policies, guidelines, and information on various natural disasters.

India Meteorological Department (IMD) - Cyclone Information(documentation)

Provides real-time updates, advisories, and historical data on cyclones affecting the Indian subcontinent.

Geological Survey of India (GSI) - Seismology(documentation)

Offers information on seismic zoning, earthquake monitoring, and research related to seismology in India.

Central Water Commission (CWC) - Flood Forecasting(documentation)

Provides data and information on flood forecasting and warning systems across major river basins in India.

UPSC Geography Optional - Natural Disasters Lecture by Unacademy(video)

A comprehensive video lecture covering natural disasters relevant to the UPSC syllabus, with a focus on Indian context.

Understanding Earthquakes - USGS(wikipedia)

A foundational resource from the U.S. Geological Survey explaining the science behind earthquakes, their measurement, and effects.

Tropical Cyclone Formation - National Hurricane Center(documentation)

Explains the scientific process of tropical cyclone formation, which is applicable to cyclones in the Indian Ocean.

Drought Monitoring and Early Warning Systems - FAO(documentation)

Information from the Food and Agriculture Organization on drought monitoring, impacts, and early warning systems globally.

Indian Geography: Natural Disasters - StudyIQ IAS(video)

Another valuable video resource from StudyIQ focusing on natural disasters in Indian geography, tailored for competitive exams.

Disaster Management in India: Challenges and Opportunities - ORF(blog)

An analytical piece discussing the current state and future prospects of disaster management in India.