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| Los Chocoyos eruption | |
|---|---|
| Name | Los Chocoyos eruption |
| Location | Guatemala |
| Type | Caldera |
| Last eruption | ~AD 430?–AD 460? (disputed) |
Los Chocoyos eruption is a major late Holocene volcanic event centered on the Atitlán Caldera and nearby highland centers in Guatemala, producing one of the region's most widespread pumice and ash layers. This eruption has been a pivotal marker in New World tephrochronology, correlating with stratigraphic sequences studied by investigators associated with Smithsonian Institution, Universidad de San Carlos de Guatemala, and international teams from United States Geological Survey, University of Cambridge, and Universität Bern. Interpretations of its magnitude, timing, and impacts have informed debates involving researchers from NOAA, Max Planck Society, and regional archaeological projects at Tikal, Palenque, and Copán.
The source region lies within the volcanic highlands of Guatemala and the broader Central America Volcanic Arc, where interactions among the Cocos Plate, Caribbean Plate, and continental crust produce stratovolcanoes, calderas, and ignimbrite-forming systems such as Atitlán Caldera, Lake Atitlán, Santiago Atitlán, and nearby edifices like Tajumulco and Santa María. Tectonics involving the Middle America Trench, subduction-related magmatism studied by teams from Geological Society of America and British Geological Survey set the geochemical framework traced in pumices and glass shards, with isotope studies by groups at California Institute of Technology and ETH Zurich linking magmatic sources to crustal assimilation processes described in petrology literature from University of Tokyo and Instituto de Geología, UNAM.
Field, geochemical, and stratigraphic observations indicate an explosive, caldera-forming event that produced voluminous pyroclastic density currents and widespread tephra, consistent with high explosivity indexed against cases like the Mount Tambora eruption of 1815 and Toba catastrophe theory comparisons used by researchers at University of Oxford and Columbia University. Volume estimates by investigators affiliated with Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología and USGS vary, with some proposing dense-rock equivalent outputs rivaling large ignimbrite eruptions catalogued by Geological Society of London. Petrological work from University of California, Berkeley and Michigan State University shows high-silica rhyolitic to dacitic compositions documented in studies citing analogs such as Yellowstone Caldera and Campi Flegrei.
Tephrochronological frameworks linking glass chemistry and stratigraphic position have been developed by teams from Smithsonian Institution, University of Sheffield, and Rutgers University, using methods refined at Lawrence Berkeley National Laboratory and labs at University of Oxford. Radiocarbon dates reported by laboratories associated with Australian National University, University of Arizona, and Woods Hole Oceanographic Institution provide calibrated age ranges that have produced competing chronologies, intersecting debates involving chronologists from Cambridge University and University of Copenhagen. Correlations to distal ash layers in Lake Atitlán, Lake Petén Itzá, Pacific Ocean cores, and lacustrine sequences studied by Paleoecology teams from Smithsonian Tropical Research Institute and Monash University have expanded the tephra fingerprint across Mesoamerica.
Ignimbrite sheets, pumice fall deposits, and ash layers attributed to the eruption are mapped across Guatemala, southern Mexico, parts of El Salvador, and lacustrine sediments in the Pacific and Caribbean margins by mapping projects led by INETER, USGS, and academics at Universidad del Valle de Guatemala. Petrographic and geochemical fingerprints established by groups at University of New Mexico and Ohio State University link distal tephras in sediment cores from Gulf of Tehuantepec, Gulf of Honduras, and highland basins such as Valle de Guatemala. Depositional characteristics compared with stratigraphies at Volcán de Fuego, Santiaguito, and Pacaya help constrain eruption column heights and dispersal patterns used by volcanologists from IAVCEI and American Geophysical Union.
Studies combining paleoclimate proxies from Greenland ice cores, Andean lake records, and tree-ring chronologies analyzed by teams at NOAA Paleoclimatology Program, Columbia University's Lamont-Doherty Earth Observatory, and University of Bern evaluate potential short-term cooling and environmental stress following the eruption. Comparisons with sulfate signals detected in ice records interpreted by National Snow and Ice Data Center and NCAR fostered discussion about regional versus hemispheric climate forcing, with model simulations performed by groups at Met Office Hadley Centre and NCAR exploring aerosol radiative effects analogous to studies of Krakatoa and Mount Pinatubo. Local ecological disruptions, sedimentation changes, and lake eutrophication documented by researchers at Universidad de San Carlos de Guatemala and Smithsonian Tropical Research Institute indicate lasting landscape impacts.
Archaeological teams from Universidad del Valle de Guatemala, Peabody Museum, and Institute of Archaeology, National University of Honduras have investigated stratified sites where tephra overlies or interleaves cultural deposits at locations like Tikal, Iximche, Kaminaljuyu, and highland settlements excavated by projects affiliated with Harvard University and University College London. Interpretations of cultural response, migration, and hiatuses draw upon chronologies advanced by scholars at National Geographic Society, American Anthropological Association, and British Museum, with debates on population resilience and social reorganization paralleling studies of eruption impacts on societies at Pompeii and Akrotiri.
Research on the eruption spans work by early 20th-century geologists publishing through institutions such as Carnegie Institution for Science and later systematic studies by teams from Smithsonian Institution and Universidad de San Carlos de Guatemala, with continuing controversy over exact magnitude, calibrated age, and correlation of distal tephras debated at conferences of IUGG, IAVCEI, and American Geophysical Union. Competing interpretations advanced by groups at University of Cambridge, USGS, and ETH Zurich involve differing radiocarbon calibrations, glass-shard geochemistry protocols developed at British Geological Survey, and field stratigraphic correlations conducted by regional experts at INSIVUMEH. Ongoing multidisciplinary studies integrating geochemistry, archaeology, paleoclimate, and numerical modeling by consortia including NASA and European research networks aim to resolve outstanding uncertainties.
Category:Volcanic eruptions in Guatemala