Discuss India’s vulnerability to earthquake-related hazards. Give examples, including salient features of major disasters caused by earthquakes in different parts of India during the last three decades.

Introduction: The Bureau of Indian Standards code IS 1893 divides India into seismic Zones II to V, and roughly 59% of the landmass sits in the moderate-to-severe Zones III, IV and V. This makes seismic risk one of the country's gravest natural threats, sharpened by rapid urban growth on hazardous ground.

Why India is vulnerable:

• Tectonic setting: The northward push of the Indian plate against the Eurasian plate keeps the Himalayan arc and the northeast (Zone V) under constant strain, while the Kutch and Andaman arcs add intra-plate and subduction risk.
• Exposure: Dense, unplanned cities sit on soft alluvium that amplifies shaking, and millions live in the high-hazard belt from Kashmir to Arunachal. The Latur quake showed even the "stable" Deccan can rupture.
• Fragile built stock: Most housing is non-engineered masonry on weak foundations, and ductile-detailing rules are poorly enforced at the municipal level.

Major earthquakes (last three decades):

• Latur (1993, M6.4): Struck Maharashtra's peninsular shield, killed nearly 10,000, and forced an upward revision of seismic-zoning maps.
• Bhuj (2001, M7.7): One of India's deadliest, over 20,000 dead in Gujarat; it catalysed the Disaster Management Act, 2005 and mandatory ductile detailing in higher zones.
• Sikkim (2011, M6.9): A Himalayan quake that triggered landslides, blocked hill roads and exposed weak hill-town construction.

Conclusion: India has built early-warning research and a legal framework, but retrofitting and code enforcement lag badly. Strict building bye-laws, seismic micro-zonation of cities, and regular community drills must close the gap between law and the ground.