A tectonic shift in thinking to build seismic resilience
India’s Seismic Risk: Need for Urgent Resilience and Structural Reform
Context
The 4.4 magnitude tremor in Delhi on July 10, 2025, though minor, is a stark reminder of India’s deep seismic vulnerability. Over 80% of Delhi’s infrastructure remains non-compliant with seismic safety norms, especially buildings constructed before 2000.
India’s Tectonic Setting
- India lies on the colliding Indian-Eurasian plate boundary, moving 4–5 cm/year.
- This motion is responsible for the formation of the Himalayas, the world’s most seismically volatile region.
- The region is overdue for a “Great Himalayan Earthquake” (≥8 magnitude), threatening 300+ million people across India, Nepal, and Bhutan.
Vulnerability Zones
| Zone | Risk Level | Example Areas | Peak Ground Acceleration (PGA) |
| V | Very High | NE states, Andaman & Nicobar, Bhuj | ≥ 0.36g |
| IV | High | Delhi, parts of North India | ~0.24g |
| II-III | Moderate | Rest of peninsular India | < 0.16g |
- Delhi: Seismic Zone IV, with liquefaction-prone soils, 5,000+ high-rises, many flouting IS 1893:2016 code (for earthquake-resistant design).
- Northeast: Frequent tremors due to proximity to Myanmar fault zones.
- Kutch, Gujarat: Still vulnerable post-Bhuj earthquake (2001).
Challenges
- Urbanisation without Seismic Planning:
- Rapid, unregulated construction in high-risk zones.
- Poor adherence to seismic codes, especially in older buildings.
- Inadequate Enforcement and Awareness:
- IS 1893:2016 standards are often ignored.
- National Center for Seismology (NCS) has early warning apps (like IndiaQuake), but public preparedness is low.
- Global Context Ignored:
- A global surge in seismic activity (e.g., Myanmar, Tibet, Greece, Indonesia) warns of increased tectonic unrest.
- India’s response remains reactive, not preventive.
Solutions and Strategies
Structural Measures:
- Retrofitting with steel jacketing, especially for older buildings in Delhi.
- Deep pile foundations in soft soil areas.
- Base isolation systems for critical infrastructure (e.g., hospitals, bridges).
- Avoiding construction on floodplains and soft basins.
Institutional and Policy Reforms:
- Strict enforcement of IS codes by local bodies like Delhi Development Authority.
- Annual investment of ₹50,000 crore recommended for national retrofitting.
- Expand early warning systems to rural and high-risk areas (e.g., NE India).
Global Best Practices:
- Bangkok: Seismic codes updated in 2007; use of high-strength concrete (30–40 MPa).
- Myanmar: High casualty toll in 2025 due to non-enforcement of seismic regulations.
Sakharov-like Ethical Imperative
Just as Sakharov framed principles for understanding the cosmos, the author urges India to treat seismic preparedness as a “technical and moral duty” — especially after tragedies like Bhuj (2001) and Nepal (2015).
Conclusion
The July 2025 Delhi tremor is not just a seismic event but a civilizational alert. It exposes the fragility of India’s urban ecosystems and calls for a tectonic shift in policy, engineering practice, and public awareness. Without immediate action, millions of lives and livelihoods are at risk. The window for preparation is closing fast.
