Revision summary
Himalayan collision and the north-east put large populations in Zones IV and V; alluvium can amplify shaking in the plains. The peninsula is not risk-free, as Latur 1993 showed. Bhuj 2001 was a great urban disaster of failed multi-storeys on Republic Day. The 2004 tsunami made Andaman and Tamil Nadu earthquake-coast disasters. Kashmir 2005, Sikkim 2011, and Nepal 2015 extended the Himalayan lesson into the 2010s.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
India sits where the Indian plate drives under Eurasia. That collision makes the Himalaya and the north-east highly seismic, while the peninsula is not immune to intraplate shocks. Vulnerability is the product of that geology plus dense towns, poor masonry, and long hospital-to-fault distances.
Body
Why India is vulnerable
- The Himalayan arc, Kashmir, Uttarakhand, Nepal border, Sikkim, and the north-east lie in BIS seismic Zones IV and V.
- The Indo-Gangetic plains can shake from Himalayan ruptures and from soft alluvium that amplifies motion under mega-cities.
- The peninsula is stable relative to the arc, yet Killari 1993 and Bhuj 2001 showed intraplate and failed-rift earthquakes can devastate unprepared Deccan and Kachchh towns.
- Andaman–Nicobar and the east coast are exposed to tsunami when a great submarine earthquake occurs, as in 2004.
- Risk is social: unreinforced brick, hillside cutting, and lifeline failure (power, water, hospitals) kill after the wave has passed. NDMA and NDMF exist because geology will not pause.
Major disasters of the last three decades (from 2021)
- Uttarkashi 1991 and Chamoli 1999: Garhwal Himalayan shocks that flattened hill masonry and showed the central seismic gap is not a comfort.
- Latur / Killari, Maharashtra, 1993: about magnitude 6.2 intraplate earthquake before dawn; roughly 8,000–10,000 dead in poorly built village houses on the Deccan plateau, a region once sold as “safe”.
- Bhuj, Gujarat, 26 January 2001: about magnitude 7.6–7.7; on the order of 13,000–20,000 dead, Ahmedabad multi-storeys failed far from the epicentre, and Republic Day gatherings raised the human toll. Salient feature: urban RC-frame failure plus a long Kachchh rupture.
- Indian Ocean earthquake and tsunami, 26 December 2004: Sumatra megathrust; Andaman and Nicobar and the Tamil Nadu coast took the Indian death toll. Salient feature: the hazard was water, not only shaking.
- Muzaffarabad / Kashmir, 2005: a great Himalayan earthquake that killed tens of thousands in Pakistan-administered Kashmir and hundreds on the Indian side; landslides cut valleys.
- Sikkim 2011 (about 6.9) and the 2015 Gorkha, Nepal earthquake: Himalayan events that killed in Sikkim, Bihar, and Uttar Pradesh through shaking, landslides, and collapsed brick. Salient feature: trans-boundary rupture and hill-road failure.
What the record teaches
- Intraplate “surprise” and Himalayan “expected” events both kill when codes are not built.
- Tsunami warning, seismic microzonation, and retrofit of hospitals are as much the answer as a new map colour.
Flow diagram
flowchart TD P[Indian plate collision] --> H[Himalaya NE Zone IV-V] P --> I[Intraplate peninsula] P --> T[Andaman tsunami] H --> D[Disasters 1991-2015] I[I] --> D[D] T[T] --> D[D] B[Weak masonry cities] --> V[High vulnerability]
Conclusion
India’s earthquake hazard is Himalayan collision, a live north-east, a tsunami coast, and a peninsula that can still break. The last three decades — Latur, Bhuj, the 2004 tsunami, Kashmir 2005, Sikkim 2011 — show that vulnerability is bad buildings on a live plate.
Quick related
Students also ask
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Discuss the recent measures initiated in disaster management by the Government of India departing from the earlier reactive approach.
Next question on this syllabus topic (2020 · Q18). View answer →
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Is peninsular India safe from great earthquakes?
It is less frequent than the Himalaya. Latur and Bhuj prove that rare intraplate events can still be national disasters.
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What kills more, magnitude or buildings?
Magnitude sets the energy. Unreinforced masonry, soft storeys, and missing tsunami routes set the death toll.
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