What was the cause of the 2500 deaths that occurred near Vaiont dam Italy in 1963?

On 9 October 1963, during initial filling, a landslide caused a megatsunami in the lake in which 50,000,000 m3 (1.8×109 cu ft) of water overtopped the dam in a wave of 250 m (820 ft), which brought massive flooding and destruction to the Piave Valley below, leading to the destruction of several villages and towns, ...



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On October 9, 1963, at 10:39 pm, a part of the mountain from the top of Monte Toc, (north of Venice, in the Dolomites) slide into the reservoir below the Vajont dam and caused the water to rise up to 250 meters.

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A wave of water washed above the lake to Casso and Erto, communities above the reservoir, where the air blast and water destroyed buildings and caused at least 158 fatalities. Five downstream towns were destroyed including Longarone, Pirago, Rivalta, Villanova, and Fae.

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An updraft of air, rocks, and water climbed the canyon walls to around 850 feet above the reservoir. Waves of water reached greater than 330 feet above the dam crest. Approximately 20,000 acre-feet of water went over the dam, creating a flood depth at the mouth of Vajont River of about 230 feet, one mile downstream.

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On October 9, 1963, at 10:39 pm 260 million cubic meters of rock broke off from the top of Monte Toc, on the border between Veneto and Friuli Venezia Giulia. It fell into the reservoir of the Vajont Dam, producing an enormous wave of at least 50 million cubic meters of water.

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The failure of the South Fork Dam, which affected Johnstown, is currently regarded as the worst dam failure in U.S. history. About eight miles to the east of Johnstown, Pennsylvania, was where the South Fork Dam, a rock and earthen dam, was built.

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On October 9, 1963, a landslide in Italy leads to the deaths of more than 2,000 people when it causes a sudden and massive wave of water to overwhelm a dam. The Diga del Vajont dam was built in the Vaiont Gorge to supply hydroelectric power to Northern Italy.

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Banqiao Dam Failure (China, 1975) The Banqiao Dam failure is considered the deadliest dam disaster in history. Heavy rainfall caused the dam to collapse, leading to a catastrophic flood. The estimated death toll ranges from 26,000 to 171,000, with millions of people affected.

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Francis Dam in the San Francisquito Canyon. Nearby these haunting reminders, there is a sign: “On March 12, 1928, just before midnight, it collapsed and sent over twelve billion gallons of water roaring down the valley of the Santa Clara River. Over 450 lives were lost in this, one of California's greatest disasters.”

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The St. Francis Dam, created by the Los Angeles County Water and Power company as part of the California aqueduct system, collapsed at 11:58 pm on March 12, 1928, making it the was the worst manmade disaster in California history.

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