GS1 › Geophysical Phenomena and Resource Distribution

Revision note: Earthquakes and Tsunamis

  • Focus (hypocentre) vs epicentre; elastic rebound theory
  • Magnitude (Richter / Mw, ×32 energy per unit) vs intensity (Mercalli I–XII)
  • Belts: Circum-Pacific ~80%, Alpine–Himalayan ~15%
  • India: zones II–V (BIS IS 1893); Zone V – NE, J&K, HP, UK, Kachchh, A&N; 2025 map adds Zone VI
  • Bhuj 2001 Mw 7.7; Assam 1950 Mw ~8.6; Koyna 1967 reservoir-induced
  • Tsunami: shoaling, sea withdraws first; 2004 Mw 9.1 Sumatra
  • ITEWC at INCOIS Hyderabad (2007); Tsunami Ready villages in Odisha (2020)
Revision card summarising Earthquakes and Tsunamis
One-page visual summary of the key points to revise.

Source: https://upscprep.in/upsc/gs1/geophysical-phenomena-and-resource-distribution/earthquakes-and-tsunamis/ · UPSCPrep.in

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