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The Andahua-Orcopampa volcanic field in the Andahua valley area, 20 km ENE of Nevados de Coropuna, is a large 60 x 60 km scoria cone and lava field. Known locally as the "Valley of the Volcanoes," the volcanic field lies in a series of deep NNW-SSE-trending, on echelon valleys: Orcopampa, Andahua and Ayo. The volcanic field contains extremely youthful dominantly trachyandesitic cinder cones and lava flows that have destroyed buildings and may be only a few hundred years old. The area was reported to have been active during the time of the Incas and to have "become active again" in 1913. Lava flows have repeatedly dammed the Río Andagua valley, and an existing small lake was impounded by the youngest lavas.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|[ 1913 Mar 6 ]||[ Unknown ]||Uncertain|
|1490 ± 40 years||Unknown||Confirmed||Radiocarbon (uncorrected)||Chilcayoc Grande|
|0940 BCE ± 100 years||Unknown||Confirmed||Radiocarbon (uncorrected)||Cerro Maurus I|
|2110 BCE ± 50 years||Unknown||Confirmed||Radiocarbon (uncorrected)||Cerro Tichsó|
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|Andagua Valley | Orcopampa Volcanic Field | Andahua Valley|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Achacara, Loma||Pyroclastic cone||4150 m||15° 20' 0" S||72° 19' 41" W|
|Antaymarca, Volcán||Pyroclastic cone|
|Challhue Mauras, Volcán||Pyroclastic cone||4319 m||15° 22' 8" S||72° 19' 59" W|
|Chilcayoc Grande, Volcán||Pyroclastic cone||3150 m||15° 31' 59" S||72° 17' 17" W|
|Chilcayoc, Volcánes||Pyroclastic cone||3300 m||15° 31' 0" S||72° 18' 47" W|
|Cochapampa, Cerro||Pyroclastic cone|
|Cruz, Cerro la||Pyroclastic cone|
|Jajarana, Cerro||Pyroclastic cone||4600 m||15° 19' 23" S||72° 25' 1" W|
|Jechapita, Volcán||Pyroclastic cone||3350 m||15° 32' 0" S||72° 18' 40" W|
|Jenchana, Volcán||Pyroclastic cone||3550 m||15° 31' 1" S||72° 20' 35" W|
|Mauras, Cerro||Pyroclastic cone||4250 m||15° 20' 6" S||72° 19' 34" W|
|Misahuana Mauras, Volcán||Pyroclastic cone||4713 m||15° 15' 25" S||72° 28' 59" W|
|Pabellon Mauras, Volcán||Pyroclastic cone||4507 m||15° 17' 10" S||72° 27' 32" W|
|Pichihua, Cerro||Pyroclastic cone||4650 m||15° 17' 28" S||72° 25' 59" W|
|Pucu Mauras, Cerro||Pyroclastic cone||4287 m||15° 25' 26" S||72° 20' 13" W|
|Puma Ranga, Cerro||Pyroclastic cone||4653 m||15° 16' 0" S||72° 27' 29" W|
|Santa Rosa||Pyroclastic cone|
|Sayhua, Cerro||Pyroclastic cone||4650 m||15° 16' 1" S||72° 27' 22" W|
|Tischó, Cerro||Pyroclastic cone||3900 m||15° 28' 52" S||72° 22' 34" W|
|Yana Mauras, Volcán||Pyroclastic cone||4588 m||15° 18' 43" S||72° 25' 59" W|
|Yanamauras, Cerro||Pyroclastic cone||3775 m||15° 28' 41" S||72° 20' 53" W|
|The cinder cones at the center and upper right, surrounded by a prominent field of lava flows, are located in the Andahua valley, known locally as the "Valley of the Volcanoes." The large 60 x 60 km scoria cone and lava field contains extremely youthful lava flows, some of which may be only a few hundred years old. The volcanic field was reported to have been active during the time of the Incas. Lava flows have repeatedly dammed the Río Andagua valley, and an existing small lake was impounded by the youngest lavas.
Photo by Norm Banks, 1988 (U.S. Geological Survey).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
de Silva S L, Francis P W, 1990. Potentially active volcanoes of Peru - observations using Landsat Thematic Mapper and Space Shuttle imagery. Bull Volc, 52: 286-301.
Delacor A, Gerbe M-C, Thouret J-C, Worner G, Paquereau-Lebti P, 2007. Magma evolution of Quaternary minor volcanic centres in southern Peru, Central Andes. Bull Volc, 69: 581-608.
IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..
Parodi-I A, 1975. Volcanes del Peru. Soc Geog Lima Bull, 94: 20-23.
Ruprecht P, Worner G, 2007. Variable regimes in magma systems documented in plagioclast zoning patterns: El Misti stratovolcano and Andahua monogenetic cones. J Volc Geotherm Res, 165: 142-162.
Sapper K, 1917. Katalog der Geschichtlichen Vulkanausbruche. Strasbourg: Karl J Trubner, 358 p.
Shippee R, 1932. Lost valleys of Peru: results of the Shippee-Johnson Peruvian expedition. Geog Rev, 22: 562-581.
Sorensen E V, Holm P M, 2008. Petrological inferences on the evolution of magmas erupted in the Adagua Valley, Peru (Central Volcanic Zone). J Volc Geotherm Res, 177: 378-396.