IIT Madras Tool Finds Standard Seismic Maps Underestimate Earthquake Risk for Himalayan Dams
Researchers at IIT Madras developed a probabilistic seismic hazard analysis tool that analyzed over 68,000 earthquakes dating back to 2,600 BC. The tool found that standard seismic zone maps used for major Himalayan infrastructure projects are too conservative and may underestimate actual earthquake risks.
A team of researchers at the Indian Institute of Technology Madras has developed a new tool for probabilistic seismic hazard analysis that reveals standard earthquake risk maps may be significantly underestimating the danger for major infrastructure in the Himalayas.
The tool analyzed more than 68,000 earthquakes dating back to 2,600 BC, drawing on one of the most extensive historical seismic datasets ever compiled for the region. The analysis found that current seismic zone maps used for planning and building large dams in the Himalayan region are overly conservative in their projections.
The concern is that "mega-dams" in the Himalayas may be designed based on earthquake risk estimates that do not accurately reflect the actual hazard. If the true risk is higher than the maps suggest, these structures could be more vulnerable to seismic events than their designs account for.
The Himalayas are one of the most seismically active regions in the world. The collision of the Indian and Eurasian tectonic plates generates frequent earthquakes, including some of the largest ever recorded. Large dams in the region hold enormous volumes of water, and a failure during a major earthquake could have catastrophic downstream consequences.
The IIT Madras team says their probabilistic approach provides a more accurate picture of seismic hazard by accounting for the full range of historical earthquake data rather than relying on simplified zone classifications.
The research was published in September 2026 and has drawn attention from engineers and policymakers involved in infrastructure planning across South Asia. The team is calling for updated seismic standards for critical infrastructure in high-risk zones.
