Chandigarh: A comprehensive seismic micro-zonation assessment conducted by researchers from the Central University of Himachal Pradesh has revealed that Chandigarh and its peripheral sectors face a heightened risk of structural damage during a major Himalayan earthquake. The scientific paper highlights that the city’s underlying geology is highly susceptible to ground-shaking amplification. Geotechnical engineers have urged the Union Government and the Chandigarh Administration to immediately integrate these detailed findings into regional urban planning models and local building bylaws to prevent future catastrophic structural failures.
The extensive study, published in the peer-reviewed Journal of Applied Geophysics, outlines the most high-resolution seismic hazard profiling undertaken for the joint capital to date. Researchers executed intense field investigations across hundreds of distinct locations throughout Chandigarh using advanced geophysical techniques and deep exploratory borehole drilling to accurately map subsurface characteristics.
The empirical data gathered during the fieldwork revealed that Chandigarh is situated directly above a thick, deep sedimentary basin resting above rigid bedrock. The overlying soft alluvial deposit consists of alternating loose layers of clay, sand, silt, and gravel. Due to these specific soft ground attributes, the city represents relatively soft ground conditions where the loose sedimentary composition acts as a natural amplifier for seismic energy, meaning waves traveling from a remote Himalayan epicenter could intensify substantially upon reaching the urban surface.
The core findings of the geophysical modeling indicate that local soil conditions will drastically intensify the magnitude of seismic shaking in multiple high-risk sectors. This level of ground acceleration poses an immediate threat to the structural integrity of thousands of residential, commercial, and administrative buildings across the metropolitan area.
The structural threat is bifurcated across the city’s unique architectural timeline. The primary concern lies with the legacy stock of older, low-rise residential units built using unreinforced burnt brick masonry. These structures lack crucial modern anti-seismic features like concrete band course ties or vertical steel reinforcement, rendering them highly vulnerable to sudden lateral shear forces. Concurrently, the city’s rapidly expanding vertical skyline, featuring high-density commercial developments and multi-storey residential complexes scaling up to fifteen storeys, remains vulnerable to resonant shaking if the structural frequency of the towers aligns with the amplified ground frequencies.
Prior to this detailed project, seismic hazard assessments for Chandigarh relied almost entirely on macro-level regional data that overlooked localized soil variations. The current investigation fills this crucial information gap by providing localized hazard maps detailing exact soil properties, localized amplification zones, and predictable structural responses. The complete dataset has been officially submitted to the Union Government and the Chandigarh Administration to assist municipal engineers, town planners, and disaster management teams in formulating targeted retrofitting strategies.
The researchers concluded that utilizing site-specific seismic behavior models must become mandatory for approving future real estate expansions in Chandigarh. By applying these scientific inputs to ongoing urban development, municipal bodies can effectively predict structural damage patterns, enforce strict compliance with earthquake-resistant engineering principles, and significantly reinforce public safety infrastructure before the next major seismic event hits the Himalayan belt.
