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Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|1750 ± 100 years||Unknown||Confirmed||Radiocarbon (uncorrected)||Achín-Niellu (Volcán Escorial)|
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.
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Achin-Niellu||Cone||39° 52' 0" S||71° 33' 0" W|
|Angostura, La||Tuff ring||954 m||39° 47' 13" S||71° 31' 44" W|
|Caririñe||Stratovolcano||39° 49' 0" S||71° 40' 0" W|
|Chihuio||Stratovolcano||40° 10' 0" S||71° 49' 30" W|
|Escorial, Cerro (Achin-Niuellu)||Cone||39° 52' 0" S||71° 33' 0" W|
|Pirihueico||Stratovolcano||1940 m||39° 55' 0" S||71° 36' 0" W|
|Quelguenco||Stratovolcano||1692 m||39° 58' 0" S||71° 37' 0" W|
|The blocky, partially forested Escorial lava flow in the foreground originated from Achín-Niellu (also known as Achen Niyeu or Cerro Escorial) pyroclastic cone (center). The Escorial lava flow traveled north into glacial Lago Epulafquen, forming a prominent lava delta. Oral accounts of local residents stated that the flow was witnessed by their grandparents, who described the eruption of smoke, ash, and lava that changed the shoreline of the lake.
Photo by Moshe Inbar, 1995 (University of Haifa).
|The linear grayish lava flow extending into two lakes at the center originated from the Achín-Niellu cinder cone in the snow-covered area at the bottom-center of this NASA Space Station image with north to the upper left. The distal end of 7.5-km-long flow forms a large delta into Lago Epulafquen. A cinder cone separates this lake (known in the Machupe language as "Two Lakes") from the large lake at the upper right, Lago Huechulafquen. The lake at the right-center is Lago Curruhué.
NASA Space Station image ISS004-E-7197, 2002 (http://eol.jsc.nasa.gov/).
|The blocky, partially forested Escorial lava flow in the foreground is seen from the north on a boat on Lago Epulafguen. The flow originated from the Achín-Niellu pyroclastic cone (center), which is part of the Huanquihué group of young basaltic volcanoes in Argentina near the Chilean border south of Lanín volcano. The Escorial lava flow was erupted about 200 years ago, and local residents recount oral histories of the eruption, which was observed by their grandparents.
Photo by Héctor Osvaldo González, 2007.
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.
Corbella H, Susana Alonso M, 1987. Post-glacial hydroclastic and pyroclastic deposits in the Lanin National Park, north Patagonian cordillera, Nequen, Argentina. Andean Volc Internatl Symp, Tucaman, Argentina, 9 p.
Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.
Inbar M, Risso C, Parica C, 1995. The morphological development of a young lava flow in the south western Andes - Neuquen, Argentina. Zeit Geomorph, 39: 479-487.
Lara L, Rodriguez C, Moreno H, Perez de Arce C, 2001. Geocronologia K-Ar y geoquimica del volcanismo plioceno superior-pleistoceno de los Andes del sur (39-42° S). Rev Geol Chile, 28: 67-90.
|Large Eruptions of Huanquihue Group||Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).|
|WOVOdat||WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.|
|EarthChem||EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).|
|Smithsonian Collections||Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.|