India withdraws revised earthquake zoning
The withdrawn revision no longer serves as the binding basis for earthquake design parameters in building and infrastructure projects. This removes the higher peak ground acceleration values (up to near 1g) embedded in the withdrawn framework.
Change
India rescinded the Bureau of Indian Standards (BIS) Gazette notification that introduced IS 1893 (Part 1):2025 on March 3, 2026, and immediately restored the IS 1893 (Part 1):2016 seismic code.
Why it matters
Design, procurement and finance teams cannot rely on the higher probabilistic seismic hazard parameters introduced in the 2025 code and must pause any work or spending triggered by those parameters until authorities provide new instructions. Approvals, change orders and lender conditions that referenced the now-withdrawn zoning are in procedural limbo and require active re-evaluation before projects proceed.
Implications
- — Metro Rail corporations' engineering and design teams must suspend implementation of structural upgrades based on IS 1893:2025 and re-submit or reaffirm designs under IS 1893:2016 — failure to do so may lead to rejected submissions or regulatory pushback.
- — Project finance teams at housing and infrastructure developers must re-run cost, covenant and feasibility calculations and notify lenders of the withdrawal — failure to update lenders risks covenant breaches or mispriced financing arrangements.
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