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| Laki (1783–1784 eruption) | |
|---|---|
| Name | Laki |
| Other name | Lakagígar |
| Photo caption | Crater row of Lakagígar, Iceland |
| Elevation m | 818 |
| Location | Iceland |
| Range | Eldgjá volcanic system |
| Coordinates | 63, 57, N, 18... |
| Type | Fissure vent |
| Last eruption | 1783–1784 |
Laki (1783–1784 eruption) was a catastrophic fissure eruption on Iceland's Skaftárhreppur district that produced vast lava flows and released enormous sulfur gases, triggering widespread environmental, health, and climatic disturbances across Europe, Greenland, and beyond. The event is notable for its role in contemporary famines, public health crises, and for advancing volcanic science through later studies by figures associated with Benjamin Franklin, Sir Joseph Banks, and early climatologists. Its impacts influenced political debates in the Kingdom of Denmark and economic strains in France, contributing to historical conditions preceding the French Revolution.
Laki is part of the Grímsvötn volcanic system on the Icelandic Mid-Atlantic Ridge where the North American Plate and Eurasian Plate diverge, interacting with the Iceland hotspot and producing frequent rift-zone eruptions. The fissure swarm that produced Lakagígar is linked to the larger Laki fissure and nearby Eldgjá eruption of 934, reflecting long-term magmatic processes studied by researchers at University of Iceland, Icelandic Meteorological Office, and geologists such as Þorvaldur Þórðarson. Prior to 1783, local sagas and maps from Reykjavík and accounts by Danish West Indies officials noted geothermal activity and lava fields in the Skaftá river basin.
The eruption began on 8 June 1783 with a series of explosive and effusive episodes along a ~27-kilometre fissure, producing basaltic lava flows that inundated farmland and created the Lakagígar crater row. Plume emission included large volumes of sulfur dioxide, hydrogen fluoride, and ash, recorded by observers in Reykjavík, the Royal Society correspondents, and merchants in Copenhagen. Contemporary accounts by clergy such as Benedikt Brynjólfsson and naturalists like Sir Joseph Banks provided early eyewitness data later synthesized by volcanologists including George P. L. Walker and Sigurdsson school researchers. Lava inundation, fire fountains, and tephra dispersal followed a pattern resembling other fissure events such as Eldgjá and Holuhraun.
Sulfur dioxide and aerosols from the eruption formed a dense “Laki haze” that drifted across Europe, North America, and Asia, detected in contemporary meteorological records kept by Benjamin Franklin’s correspondents and scientists at the Royal Society. The aerosol loading and resultant radiative forcing contributed to anomalous regional cooling, documented in climate reconstructions by Michael E. Mann, Phil Jones, and Keith Briffa, and in ice-core sulfate peaks from Greenland Ice Sheet Project records analyzed by Sigl and Ruth Mottram. Reports of vivid sunsets recorded by painters influenced artists associated with Romanticism and writers like William Wordsworth and Ralph Waldo Emerson. Volcanic winter effects intersected with North Atlantic Oscillation variability and precipitated anomalous weather patterns in the late 1780s.
Acid deposition, fluorine contamination, and ash fallout devastated pasturelands and grazing animals across southern Iceland, causing mass livestock mortality reported in parish registers compiled by Danish authorities and local clergy. The contamination of hay and water led to high fluoride uptake in sheep and cattle, paralleling later veterinary studies by R.T. Thoroddsen and modern work at University of Copenhagen. Crop failures and pasture degradation forced migrations within Iceland and disrupted trade routes linking Reykjavík with ports in Copenhagen and Grimsby. Comparable agricultural impacts were noted in Scotland, Norway, and Germany where contemporary manorial records and agronomic reports recorded reduced yields.
The "Laki haze" was associated with an acute rise in respiratory illnesses—bronchitis and pneumonia—documented in hospital records in Paris, London, and regional registries in Iceland and Greenland. Contemporary physicians such as John Hunter and public health observers in Edinburgh and Stockholm described increased mortality, while parish mortality tables in Reykjavík and administrative reports to the Kingdom of Denmark detailed a disastrous human toll. The combination of food scarcity, animal loss, and airborne toxins led to famines and waves of displacement, prompting relief responses from charitable institutions in Copenhagen and local municipal authorities.
The eruption exacerbated fiscal pressures on the Danish–Norwegian union and intensified grain shortages across France, contributing to economic stress documented in ledgers of French grain merchants and correspondence in Versailles. Contemporaneous observers linked crop failures and price inflation to civil unrest in provincial towns and to debates in the Estates-General that foreshadowed revolutionary upheaval. Insurance claims, shipping losses recorded at Port of London Authority, and disrupted trade with Iceland strained mercantile networks involving firms in Amsterdam, Hamburg, and Le Havre. Parliamentary inquiries in Copenhagen and municipal records in Bordeaux reflect attempts to quantify damages and coordinate relief.
Laki stimulated early interdisciplinary study linking volcanology, meteorology, and climatology: correspondence among Benjamin Franklin, Joseph Priestly, and the Royal Society debated atmospheric chemistry and long-range aerosol transport. Nineteenth- and twentieth-century researchers including Julius von Hann, Svante Arrhenius, and Harold Jeffreys built on Laki data to develop theories of volcanic radiative forcing and aerosol climatology. Modern analyses using ice-core geochemistry, dendrochronology by F.H. Schweingruber, and climate modeling at NASA Goddard and Hadley Centre have refined estimates of sulfur emissions and global impacts. Laki remains a case study in hazard assessment used by institutions like the United Nations Office for Disaster Risk Reduction and national volcanic observatories, informing mitigation planning for fissure eruptions such as Eyjafjallajökull (2010) and Holuhraun (2014–2015).
Category:Volcanic eruptions in Iceland Category:18th-century disasters