The Eruption of Nevado Del Ruiz Volcano Colombia, South America, November 13, 1985 (1991) / Chapter Skim
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Executive Summary
Executive Summary
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This flow disgorged through a narrow canyon onto a gently sloping alluvial fan and adjacent floodplain that extend along the eastern front of the mountains. The lahar flow devastated the city of Armero, built on the alluvial fan approximately 2.0-2.5 km downstream from the mouth of the Lagunillas River canyon.
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The continuation of sporadic volcanic activity recorded since the November 13, 1985 eruption, combined with the extensive ice cap still remaining around the summit, could result in future lahars with equally devastating consequences for the large population still living in proximity to the volcano. The study team characterized the magnitude and extent of the flows, catalogued much of the damage, and analyzed the nature of the geologic processes that led to both the initiation of the lahars and the extensive damage resulting from them.
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