Dating manizales colombia
Two major caldera-forming eruptions have occurred, the first about 560,000 years ago in an eruption which expelled about 15 cubic kilometres (3.6 cu mi) of material.
The second some time between 40,000 and 150,000 years ago, in a smaller but still sizable eruption of 2 cubic kilometres (0.48 cu mi) of material.
Subsequently, part of the caldera wall has collapsed, possibly due to instabilities caused by hydrothermal activity, and later eruptions have built up a smaller cone inside the now horseshoe-shaped caldera.
Rock falls and pyroclastic flows were reported from towns as distant as Consacá, 11.4 kilometres (7.1 mi) west of the main crater.
Galeras became active again in 1988 after 10 years of dormancy.
A Decade Volcano conference in the city of Pasto, in 1993, ended in disaster when several of the scientists present mounted an impromptu expedition on 14 January to the crater of Galeras.
An eruption occurred unexpectedly while they were at the summit, resulting in the deaths of six scientists and three tourists.
Elements in the media made the event controversial by suggesting the expedition leader, geologist Stanley Williams, who survived along with four others, had ignored safety procedures.
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The Colombian government has repeatedly ordered evacuations to temporary shelters, of more than 8500 people residing in the highest risk areas surrounding the volcano, On January 17, 2008, the volcano erupted around (local) ( UTC).