The government has released a new seismic zonation map under the updated Earthquake Design Code from the Bureau of Indian Standards (BIS). This map for the first time puts the entire Himalayan arc in a newly created Zone VI, the highest-risk earthquake danger zone in India.
Why the Change Was Made
-
Previously, the Himalayas were split across lesser risk zones (Zones IV and V), even though the entire region experiences the same tectonic stresses.
-
Ongoing collision between the Indian and Eurasian tectonic plates which continues to push the Himalayas upward builds up enormous geological stress beneath the region.
-
Several major fault systems run beneath the Himalayas (like the Main Frontal Thrust, Main Boundary Thrust, Main Central Thrust), and many long-silent fault segments haven’t ruptured in centuries. This means there is significant “stored energy” that could trigger powerful earthquakes.
What It Means for India
-
The update reveals that about 61% of India’s land area now falls under moderate to high seismic hazard zones, a major shift compared to earlier maps.
-
Infrastructure, building codes, and urban planning will need immediate review. Especially in Himalayan and foothill regions, construction will likely require stricter standards to withstand potential earthquakes.
-
Areas that earlier were considered moderately safe may now fall under higher risk which could impact future development, habitation, and disaster-preparedness strategies.
What Experts Recommend Going Forward
-
Governments and state authorities should enforce earthquake-resistant construction norms in affected zones. Existing buildings in quake-prone regions may need retrofitting or structural assessment.
-
Urban planners must avoid building new developments on active fault lines or unstable soil especially in the Himalayan foothills and adjoining plains.
-
Public awareness and emergency preparedness should be strengthened people living in high-risk zones should be informed about evacuation plans, safety drills, and early warning systems.
-
Long-term disaster risk management must be prioritized, factoring in the revised hazard zones for infrastructure, hospitals, schools, and transportation networks.
Why This Update Matters
This seismic re-zonation is one of the biggest overhauls in India’s earthquake-risk assessment in decades. By finally acknowledging the elevated danger across the Himalayas, it aims to improve resilience and inform safer urban and rural development potentially saving lives and reducing damage from future quakes.