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Popocatépetl (; Nahuatl: ) is an active volcano, located in the states of Puebla, Mexico, and Morelos, in Central Mexico, and lies in the eastern half of the Trans-Mexican volcanic belt. At 〔 it is the second highest peak in Mexico, after the Citlaltépetl (Pico de Orizaba) at . It is linked to the Iztaccihuatl volcano to the north by the high saddle known as the Paso de Cortés.〔John H. Beaman. The Timberlines of Iztaccihuatl and Popocatépetl, Mexico. Ecology Vol. 43, No. 3 (Jul., 1962), pp. 377-385〕 Popocatépetl is southeast of Mexico City, from where it can be seen regularly, depending on atmospheric conditions. Until recently, the volcano was one of three tall peaks in Mexico to contain glaciers, the others being Iztaccihuatl and Pico de Orizaba. In the 1990s, the glaciers such as Glaciar Norte (North Glacier) greatly decreased in size, partly due to warmer temperatures but largely due to increased volcanic activity. By early 2001, Popocatépetl's glaciers were gone; ice remained on the volcano, but no longer displayed the characteristic features of glaciers such as crevasses. Magma erupting from Popocatépetl has historically been predominantly andesitic, but it has also erupted large volumes of dacite.〔Sosa, G.; Gardner, J. E.; Lassiter, J. C. 2009. Magma evolution during the last 23 ky at Popocatepetl Volcano: insights from Sr, Nd, and Pb isotopes in plagioclase, pyroxene and pumice matrix. American Geophysical Union, Fall Meeting 2009, abstract #V51A-1658 ()〕 Magma produced in the current cycle of activity tends to be a mixture of the two.〔Martin, A. L.; Cifuentes, G.; Straub, S.; Mendiola, F. 2007. Magma Stagnation and Ascent at Popocatepetl Volcano, Mexico during the last 10 years. American Geophysical Union, Spring Meeting 2007, abstract #V42A-05 ()〕 ==Toponymy== The name ''Popocatépetl'' comes from the Nahuatl words 'it smokes' and 'mountain', meaning ''Smoking Mountain''. The volcano is also referred to by Mexicans as El Popo. The alternate nickname ''Don Goyo'' comes from the mountain's association in the lore of the region with San Gregorio (St. Gregory), "Goyo" being a nickname-like short form of Gregorio. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Popocatépetl」の詳細全文を読む スポンサード リンク
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