The Damghan earthquake or the Qumis earthquake occurred on 22 December 856 (242 AH) in Khorasan province, Abbasid Caliphate. The earthquake had an estimated magnitude of 7.9, and a maximum intensity of X (Extreme) on the Mercalli intensity scale. The meizoseismal area (area of maximum damage) extended for about 350 kilometres (220 mi) along the southern edge of the eastern Alborz mountains of present-day Iran including parts of Tabaristan and Gorgan. The earthquake's epicenter is estimated to be close to the city of Damghan, which was then the capital of the Persian province of Qumis. It caused approximately 200,000 deaths and is listed by the United States Geological Survey as the sixth deadliest earthquake in recorded history. This death toll has been debated.
Why this event still matters
Historical incidents shape the rules that protect people today — building codes, evacuation policy, warning systems and inspection regimes almost always trace back to a specific disaster. Studying 856 Damghan earthquake alongside current events is how preparedness improves.
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