EL VULCAN PLANCHÒN-PETEROA PHOTOGRAPHED BY LEO WEHRLI

LEO WEHRLI (1870–1954)
El Planchón-Peteroa (4,107 m - 13,474 ft)
Argentina- Chile border

In Planchon Vulcan, photo,1897, hand colorized by Anna Wehrli-Frey 1918,
ETH Library, Zurich

The volcano
EL Planchón-Peteroa (4,107m - 13,474 ft) also known as Azufre-Planchón-Peteroa or Nevado de los Banos is a complex of active volcanoes extending in a north–south direction along the border between Argentina and Chile. It consists of volcanoes of various ages with several overlapping calderas. Those include Volcán Planchón, Volcán Peteroa and Volcán Azufre. A partial collapse of the complex about 11,500 years ago produced a major debris avalanche, which followed the course of the Teno River until reaching the Chile Central Valley. Peteroa has a crater lake. Lagunas de Teno lies at the foot of Planchón volcano. In this area also is the Vergara International Pass.
Planchón-Peteroa Volcano erupted on September 6, followed by a stronger eruption on September 18. On September 6, 2010, , the volcano erupted once again, emitting a dark gray plume of volcanic ash. As winds blew the ash southeast into Argentina, residents there were warned by authorities to evacuate the nearby areas before Planchón-Peteroa would erupt again.

The photographer
Leo Wehrli was a Swiss geologist, professor and explorer. After studying music, botany, chemistry, mineralogy, petrography and geology in Berlin and Zurich, Wehrli became assistant to Albert Heim. Immediately after completing his thesis, he left for Argentina with the famous Carl Emanuel Burckhardt in 1896. Accredited by the La Plata Museum and the government of Argentina, he explored the Andes he crossed at least five times during a stay of two years. His work was more particularly oriented on the delimitation of the border between Argentina and Chile after the agreement signedbetween these two countries in 1881 and on the determination of the property of mountain peaks, ridge lines and basins slopes.
After his return to Switzerland, he worked between 1900 and 1935 as a teacher and then lecturer for the Geol. Centralblatt in Berlin ; between 1901 and 1912, he wrote nearly 500 articles. He made other trips through Europe and North Africa (Egypt) before going back to Argentina again in 1938. He has summarized his research results in numerous articles, notably in the Geographic Lexicon of Switzerland. He participated in the founding of the Zurich Adult Education Center and gave lectures there from 1921 to 1953. From 1931 to 1951 he was a member of the Swiss Alpine Club SAC commission for the Central Library and has was president for 14 years.
Wehrli left a collection of 15,000 slides, some of which were hand-colored by his wife, born Anna Frey. A large part of the works is made available online by the photographic archives of the ETH-Bibliothek in Zurich.

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2022 - Wandering Vertexes...
by Francis Rousseau