Nevado del Ruiz

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Nevado del Ruiz,

volcano, 17,457 ft (5,321 m) high, in the Cordillera Central of the N Andes, E Colombia, on the Caldas-Tolima dept. border. A broad, glacier-covered stratovolcano, it can produce explosive eruptions with pyroclastic flowspyroclastic flow,
turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of rock fragments ranging up to the size of boulders, with the heavier fragments moving along closer
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, and the melting of glaciers by those hot gases has resulted in devastating lahars (fast-moving mud and debris flows) during its eruptions, most recently in Nov., 1985, when a lahar buried or washed away Armero, a town 46 mi (74 km) away. The 1985 eruption, in which some 23,000 died, was one of the deadliest volcanic disasters of the 20th cent.
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2) Armero was a town that suffered dearly after the 1985 eruption of the Nevado del Ruiz volcano, which caused mudflows killing twenty-three thousand people.
The Nevado del Ruiz Volcano (NRV) is located in the northernmost end of the NVZ and is part of the previously-named Ruiz-Tolima volcanic complex (Herd, 1982) (Figure 5).
Williams (Editor), Nevado del Ruiz Volcano, Colombia, I.
The author would like to thank the colleagues at INGEOMINAS, the Volcanological and Seismological Observatory of Nevado del Ruiz Volcano, Manizales, Colombia, especially Alvaro P.
The organizational arrangements and decisionmaking schemes used in managing volcanic emergencies received a good deal of attention after the Armero disaster in Colombia produced by the Nevado del Ruiz Volcano in 1985.
That includes the 1970 earthquake in Peru that took 66,000 lives, the 1985 eruption of the Nevado del Ruiz volcano in Colombia that left 22,000 people dead and floods that killed as many as 50,000 in Venezuela in 1999.
Following the onset of eruptive activity at the Nevado del Ruiz volcano in Colombia during 1985, hazard mapping revealed that the doomed town of Armero was constructed on ancient mudflow, or lahar deposits.
1 Sir Clive Sinclair launched the C5 2 Britain and Singapore withdrew from UNESCO 3 In Ireland, shop sales of contraceptives were legalised 4 In Columbia, the Nevado del Ruiz volcano erupted, killing over 20,000 people wordwise The word may sound familiar, but what does it mean?
ALTERATION RELATED TO HYDROTHERMAL ACTIVITY OF THE NEVADO DEL RUIZ VOLCANO (NRV), COLOMBIA
The Nevado del Ruiz Volcano is monitored by the Volcanological and Seismological Observatory at Manizales (VSOM).
Evaluation of magmatic processes for the products of the Nevado del Ruiz Volcano, Colombia from geochemical and petrological data.