Galeras

Galeras is an Andean stratovolcano in the Colombian department of Narino, near the departmental capital Pasto. Its summit rises 4,276 meters 14,029 ft above ocean level. It has ejected regularly since the Spanish victory, with its first verifiable emission being recorded on December 7, 1580. A 1993 ejection murdered nine individuals, including six researchers who had dropped into the well of lava's hole to test gases and take gravity estimations trying to have the capacity to anticipate future emissions. It is as of now the most dynamic spring of gushing lava in Colombia. Galeras has been a functioning spring of gushing lava for no less than a million years, with andesite as the overwhelming item.

Two noteworthy caldera-shaping ejections have happened, the first around 560,000 years prior in an emission which removed around 15 cubic kilometers 3.6 cu mi of material. The second some time somewhere in the range of 40,000 and 150,000 years back, in a littler yet at the same time sizable ejection of 2 cubic kilometers 0.48 cu mi of material. Consequently, some portion of the caldera divider has crumpled, conceivably because of insecurities caused by aqueous action, and later ejections have developed a littler cone inside the now horseshoe-formed caldera. In light of its vicious eruptive history and nearness to the 450,000 individuals of Pasto, Galeras was assigned a Decade Volcano in 1991, distinguishing it as an objective for point by point think about as a major aspect of the United Nations' International Decade for Natural Disaster Reduction.