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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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A catastrophic rock slide involving over 2 million cu m of rock roared down the valley of the Llanganuco River, split into two lobes, one of which killed approximately 2,000 people in the town of Rangrahirca and the other killed approximately 19,000 people in the town of Yungay.
Many thousands of other rock slides within 100 km of Chimbote resulted in many millions of cubic meters of rock forming scree slopes at the foot of steep hills and mountains.
The slide was triggered by an earthquake 85 km away, at a depth of 54 km. In the upper and steepest drop the slide fell and swept as a nearly friction-free unit mass a distance of 14.5 km, a vertical drop of 13,700 ft, in 3 minutes. Over the next 50 km the slide moved as a fluid mass, covering the distance in 2 hours. Deposition from the slide was velocity-dependent.
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