Why did the ancient, unrestored ruins of Bam survive an earthquake better than modern repairs?
In short: When a 6.6 magnitude earthquake struck the Iranian city of Bam in 2003, it leveled the historic Arg-e Bam citadel. Yet, researchers discovered a strange paradox: older, unmaintained structures often fared better than those that had been carefully restored or modified in the late 20th century.
Arg-e Bam, located in Iran's Kerman province, was once the world's largest adobe building. Tracing its roots to the Achaemenid Empire, the fortress evolved into a vital Silk Road crossroads, famous for its cotton textiles and strategic military importance. By the time of the 2003 disaster, the site was a sprawling complex of residential zones, barracks, and government quarters, protected by massive walls and watchtowers.
The 2003 earthquake was exceptionally destructive, with a hypocenter just 7 km beneath the city. The seismic waves interacted with the local geology in a way that amplified energy, particularly affecting structures with a north-south axis. However, the survival rates of different buildings revealed a counterintuitive trend. While the main citadel—heavily restored in the late 20th century—was nearly obliterated, ancient, untouched ruins nearby, such as the Zoroastrian temple and the Khale Dokhtar citadel, sustained significantly less damage.
This phenomenon suggests that modern restoration efforts may have inadvertently compromised the structural integrity of the ancient adobe. In some cases, the addition of heavy materials or the alteration of original foundations on inhomogeneous ground made the buildings more susceptible to the violent ground motion. Conversely, the older, unmaintained sections, which had already settled or lacked the rigid modifications of modern interventions, proved more resilient to the seismic forces.
Today, the site remains a subject of ongoing restoration and study. The tragedy of 2003 serves as a sobering lesson in architectural conservation, highlighting how the pursuit of preservation can sometimes clash with the inherent wisdom of ancient engineering. Understanding why these mud-brick structures failed—or held firm—is essential for protecting the world's remaining earthen heritage.
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Sources
- Summary by Intellect · source: Arg-e Bam
- Also: Wikidata — Bam · CC0
- Also: Wikidata — Bam Citadel · CC0
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