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armero tragedy

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andrea rueda

on 4 June 2015

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Transcript of armero tragedy

The Armero tragedy was one of the major consequences of the eruption of the Nevado del Ruiz stratovolcano in Tolima, Colombia, on November 13, 1985. After 69 years of dormancy, the volcano's eruption caught nearby towns unaware, even though the government had received warnings from multiple volcanological organizations to evacuate the area when volcanic activity had been detected in September 1985.
In late 1984, geologists noticed that seismic activity in the area had begun to increase.
Increasing quantities of gases rich in sulfur dioxide and elemental sulfur began to appear in the volcano. The water content of the fumaroles' gases decreased, and water springs in the vicinity of Nevado del Ruiz became enriched with magnesium, calcium and potassium, leached from the magma.
At 9:09 pm, on November 13, 1985, Nevado del Ruiz ejected dacitic tephra more than 30 kilometers (20 mi) into the atmosphere. The total mass of the erupted material (including magma) was 35 million metric tons.
During the night, the electrical power suddenly turned off and the radios went silent. Just before 11:30 pm, a huge stream of water swept through Armero.

The US government spent over $1 million in aid, and US Ambassador to Colombia Charles S. Gillespie, Jr. donated an initial $25,000 to Colombian disaster assistance institutions. The Office of Foreign Disaster Assistance of the US Agency for International Development (AID) sent one member of the United States Geological Survey (USGS), along with an AID disaster-relief expert and 12 helicopters with support and medical personnel from Panama. The US subsequently sent additional aircraft and supplies, including 500 tents, 2,250 blankets, and several tent repair kits. Twenty-four other nations contributed to the rescue and assistance of survivors. Ecuador supplied a mobile hospital, and Iceland's Red Cross sent $4,650. The French government sent their own medical supplies with 1,300 tents. Japan sent $1.25 million, along with eight doctors, nurses, and engineers, plus $50,000 to the United Nations for relief efforts.[40] Another $50,000 was donated by the Lions Clubs International Foundation.
it agricultural town before the eruption, it was responsible fifth of Colombia's rice production, and for a large share of the cotton, sorghum, and coffee crops. Much of this success can be attributed to Nevado del Ruiz, as the fertile volcanic soil had stimulated agricultural growth.
armero tragedy
Andrea Rueda Carrascal
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