Sixth district and major changes

Source: et

Subject: Geography

Context: India has issued a radically updated seismic zoning map under the Revised Seismic Design Code (2025), placing the entire Himalayan arc in the newly created sixth most hazardous zone for the first time.

About the revised Seismic Design Code of India, 2025:

What is a seismic zone map?

The Seismic Zones Map classifies different regions of India based on their potential for earthquake hazard, which helps determine how strong structures must be to withstand earthquakes.

Published by:

The updated map was released by the Bureau of Indian Standards (BIS) as part of the revised Seismic Design Code, 2025 (IS 1893). It uses the internationally accepted Probabilistic Seismic Hazard Assessment (PSHA)

Key features of the revised zoning map:

Introduction to Zone VI: The entire Himalayan arc (J&K–Ladakh to Arunachal) has been placed in Zone VI, the most dangerous zone, for the first time. It recognizes the intense and consistent tectonic pressure along the Indian and Eurasian plate boundaries. 61% of India is now in moderate to high risk areas: a big jump from old estimates based mainly on previous earthquake foci. It reflects scientific modeling of fault segments, locked sections, and rupture potential. Automatically upgrade border cities to high-risk zone: If a city is located on the border of two zones, it will default to the high-risk zone. It moves away from administrative lines to geological facts. Inclusion of southward propagation of rupture: It is recognized that Himalayan frontal ruptures may extend southward into populated foothill areas such as Dehradun (near Mohand). Mandatory structural and non-structural safety: New standards for fixing partitions, roofs, tanks, facades, HVAC units, etc., if their weight exceeds 1% of the total load. Buildings near active faults must withstand pulse-like ground motions typical of near-fault earthquakes. New soil and ground response requirements: detailed provisions for liquefaction, soil elasticity and site-specific vibration spectra. Encourages geotechnical investigations prior to major construction works. Exposure mapping (PEMA method): includes population density, infrastructure concentration and socio-economic vulnerability. Integrates impact-based assessment with geological hazards.

indication:

Improving earthquake preparedness: Accurate risk modeling ensures stronger building codes for vulnerable areas, especially the Himalayas. Inevitability of retrofitting: Old structures, especially in Himalayan towns, including schools, hospitals and bridges, must be retrofitted. Uniformity across the Himalayan arc: redresses decades of underestimation due to inconsistent paleomaps (Zones IV and V), despite tectonic congruence.

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