By Asif Showkat Kallol (Dhaka Bureau)
One of the world’s most densely populated megacities is sitting on a ticking chronological bomb. Geologists and urban planners are sounding an urgent alarm: Dhaka, the bustling capital of Bangladesh, has entered the final, critical stage of a 300- to 500-year seismic cycle, leaving it vulnerable to a catastrophic earthquake measuring between 7.0 and 7.5 on the Richter scale at any moment.
With over 2.1 million structures in its metropolitan area, the city faces a humanitarian crisis of unprecedented proportions due to decades of unplanned urban expansion, compromised engineering standards, and fragile disaster preparedness.
The Looming Tectonic Threat
Bangladesh’s geographical location makes it a hotspot for seismic activity, situated at the volatile junction of three active tectonic plates: the Indian, Eurasian, and Burma plates.
Two major regional fault lines- the Madhupur Fault near Dhaka and the Dauki Fault near Sylhet- have remained dangerously quiet without a major rupture for over a century. Seismologists warn that this prolonged silence is not a sign of safety, but a period of massive, underground stress accumulation.
Recent tremors across the country, including a notable 5.7-magnitude earthquake in Narsingdi that tilted buildings and claimed ten lives in Dhaka and adjacent districts, are being viewed by experts not as a relief of pressure, but as ominous warning signs of a much larger impending disaster.
‘Minor tremors should not reassure us,’ seismologists warn. ‘Instead, they signal that far greater stress continues to build up along these ancient fault systems.’
A City Built on Sinking Sand
The threat to Dhaka is severely amplified by its rapid, unregulated topography. Speaking on the vulnerability of the capital, Dr. Mehedi Ahmed Ansary, a professor at the Bangladesh University of Engineering and Technology (BUET), highlighted a fatal flaw in Dhaka’s expansion:
* Soil Liquefaction: Large parts of modern Dhaka are built on reclaimed wetlands, filled merely with sand and soft sediments.
* Structural Collapse: During a high-magnitude earthquake, this ground can undergo liquefaction, essentially behaving like a liquid. High-rise buildings risk tilting, sinking, or collapsing entirely as the foundation loses stable support.
* The Fatal Stat: ‘Almost 90% of earthquake fatalities result from collapsing buildings,’ Dr. Ansary emphasized. “Strengthening vulnerable structures must become an immediate national priority.’
The Human and Structural Cost
According to government planning documents and estimates by the Capital Development Authority (RAJUK), the statistics of a potential 7.0-magnitude earthquake are staggering.
Affected Category & Estimated Impact:
* Structurally weak buildings destroyed. About 72,000.
* Structures heavily damaged & collapsed widely. Up to 850,000.
* Highly vulnerable buildings (above 4 storeys). About 40%.
* Immediate Human Casualties. 300,000 to 400,000 deaths/injuries.
Beyond the immediate collapse of buildings, Old Dhaka and various informal settlements face a secondary trap. With roads measuring a mere 3 to 5 feet wide, emergency rescue vehicles will be physically blocked from entering disaster zones. Ruptured gas pipelines are predicted to ignite uncontrollable urban fires, while shattered water and sewer networks will hinder firefighting and trigger secondary health crises.
The Path Forward: From Vulnerability to Resilience
International precedents show that while earthquakes cannot be prevented, their deadly consequences can be mitigated. Global models like Japan and Chile have proven that rigorous engineering, strict building code enforcement, and community preparedness can reduce earthquake-related fatalities by up to 80%.
To avert making Dhaka one of the deadliest urban disaster zones in modern history, experts urge the government of Bangladesh to adopt a decisive, multi-sectoral strategy:
1. Enforce the Law: Strict implementation of the Bangladesh National Building Code (BNBC) for all new constructions.
2. Mandatory Testing: Compulsory soil liquefaction testing before any real estate development.
3. Retrofitting: A massive national campaign to structurally reinforce and retrofit aging, vulnerable high-rises.
4. Urban Decentralization: Creating satellite cities to reduce the population density of central Dhaka, alongside widening roads in choked neighborhoods.
5. Grassroots Preparedness: Strengthening community-based first responder networks and equipping emergency services with advanced rescue gear.
The geological clock is ticking for Dhaka. Experts agree that bridging the gap between political commitment and structural enforcement is the only shield Bangladesh has against an inevitable tectonic reckoning.
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The Writer:
Asif Showkat Kallol: Works for the German-based online outlet The Mirror Asia as Head of News and is a Contributor at Pressenza-Dhaka Bureau.