Galeras

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Galeras is an Andean stratovolcano in the Colombian department of Nari o, near the departmental capital Pasto. Its summit rises 4,276 metres above sea level. It has erupted frequently since the Spanish conquest, with its first historical eruption being recorded on December 7, 1580. A 1993 eruption killed nine people, including six scientists who had descended...
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Galeras is an Andean stratovolcano in the Colombian department of Nari o, near the departmental capital Pasto. Its summit rises 4,276 metres above sea level. It has erupted frequently since the Spanish conquest, with its first historical eruption being recorded on December 7, 1580. A 1993 eruption killed nine people, including six scientists who had descended into the volcano's crater to sample gases. It is currently the most active volcano in Colombia. Galeras has been an active volcano for at least a million years, with andesite as the dominant product. Two major caldera-forming eruptions have occurred, the first about 560,000 years ago in an eruption which expelled about 15 cubic kilometres 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 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.