UPSC Mains Answer: On December 2004, the tsunami brought havoc on fourteen countries including India. Discuss the factors responsible for the occurrence of tsunamis and their effects on life and the economy. In the light of guidelines of NDMA (2010) describe the mechanisms for preparedness to reduce

Difficulty Level: Medium

Pre-requisite: Foundational knowledge of plate tectonics, particularly subduction zones and seismic activity, along with an understanding of India’s coastal geography and the role of disaster management authorities like NDMA. Familiarity with the 2004 Indian Ocean tsuna

Sub-category: Disaster Management (GS-III: Disaster and Disaster Management)

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Tsunamis, the colossal sea waves triggered by underwater seismic activity, pose a grave threat to coastal regions worldwide. The devastating tsunami of December 2004, which ravaged fourteen countries including India, underscored the catastrophic potential of such natural disasters. Understanding the factors responsible for tsunamis, their far-reaching effects, and mechanisms for preparedness is imperative for mitigating future risks.
Tsunamis primarily occur due to underwater earthquakes, particularly those along subduction zones where tectonic plates collide. The 2004 tsunami was caused by a massive 9.1-magnitude earthquake off the coast of Sumatra, displacing vast volumes of water. Other factors include volcanic eruptions, underwater landslides, and meteorite impacts, though these are less common. The energy released propagates as long waves, which amplify in shallow coastal waters, leading to destructive surges.
The effects of tsunamis are multifaceted. Human casualties are often staggering, as seen in 2004 with over 230,000 deaths. Infrastructure, including homes, ports, and industries, is obliterated, crippling local economies. Environmental degradation, such as saltwater intrusion and ecosystem disruption, further exacerbates the crisis. In India, states like Tamil Nadu and Andhra Pradesh suffered immense losses, with livelihoods dependent on fishing and tourism severely impacted.
To reduce risks, the National Disaster Management Authority (NDMA) issued comprehensive guidelines in 2010. Key mechanisms include: 1. Early Warning Systems: Deployment of tsunami buoys and seismic sensors to detect underwater earthquakes and issue timely alerts.
2. Community Preparedness: Regular drills, awareness campaigns, and evacuation plans to ensure public readiness.
3. Land-Use Planning: Restricting construction in high-risk coastal zones and promoting mangrove plantations as natural barriers.
4. Inter-Agency Coordination: Strengthening collaboration between meteorological agencies, local governments, and international bodies for swift response.
5. Infrastructure Resilience: Constructing tsunami-resistant buildings and shelters in vulnerable areas.
In conclusion, while tsunamis are inevitable, their impact can be mitigated through scientific advancements, proactive policies, and community engagement. The NDMA guidelines provide a robust framework, but their effective implementation remains critical to safeguarding lives and livelihoods.