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📘 How Laki’s fog starved Iceland

Stand on the black ridge of Lakagígar today and the scene looks quiet: moss, red-brown cones, and a line of craters running across southern Iceland. On 8 June 1783, this same landscape split open. A fissure eruption began in the Grímsvötn v

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. A Crack in IcelandExplain the fissure geometry, duration, lava scale, and gas release of the 1783–84 Laki eruption.Laki was a months-long fissure eruption in the Grímsvötn system, producing a huge flood-lava field and repeated emissions rather than one isolated blast.
  2. When the Air Became a HazardTrace sulfur emissions into European haze, climate anomalies, and a complex mortality record without collapsing uncertainty.Sulfur gases and aerosol traveled beyond Iceland, while heat, cold, disease, and social vulnerability shaped the health consequences seen in European records.
  3. Famine Starts with the HerdsConnect poisoned pasture and livestock loss to Icelandic famine and explain why European food impacts varied by place and season.The eruption damaged a connected food system: animals died, recovery capacity shrank, and atmospheric and weather shocks became unequal hunger through markets and households.

Questions this course answers

What made Laki different from a single short explosive eruption?

Laki opened a roughly 27-kilometre fissure, produced immense flood-lava flows, and released gases in repeated episodes over months.

Put the main atmospheric pathway in order.

The source gas is transported, chemically transformed, and then encountered as a mixture of gas and fine aerosol.

Match each observation to the most careful interpretation.

Historical climate and mortality evidence is strongest when each observation is separated from an overconfident single-cause story.

Why did livestock loss turn an eruption into a famine in Iceland?

The food system depended on animals in several ways, so their loss multiplied the original volcanic shock.

Grounded in trusted sources

  • Þorvaldur Þórðarson and Stephen Self, The Laki (Skaftár Fires) and Grímsvötn eruptions in 1783–85, Journal of Geophysical Research, 2003 — https://iris.landsbokasafn.is/is/publications/the-laki-skaft%C3%A1r-fires-and-gr%C3%ADmsv%C3%B6tn-eruptions-in-1783-85/
  • Anja Schmidt et al., Excess mortality in Europe following a future Laki-style Icelandic eruption, Proceedings of the National Academy of Sciences, 2011 — https://doi.org/10.1073/pnas.1108569108
  • Jérôme Charlier et al., Mortality induced by PM2.5 exposure following the 1783 Laki eruption using reconstructed meteorological fields, Scientific Reports, 2018 — https://pmc.ncbi.nlm.nih.gov/articles/PMC6203706/
  • Alan Robock et al., Modeling the 1783–1784 Laki Eruption in Iceland: 2. Climate Impacts, Journal of Geophysical Research: Atmospheres, 2019 — https://doi.org/10.1029/2018JD029554
  • C. S. Witham and Clive Oppenheimer, Mortality in England during the 1783–4 Laki Craters eruption, Bulletin of Volcanology, 2004 — https://doi.org/10.1007/s00445-004-0357-7
  • Nina I. A. K. et al., More poison than words can describe: what did people die of after the 1783 Laki eruption in Iceland?, Natural Hazards and Earth System Sciences, 2024 — https://nhess.copernicus.org/articles/24/2971/2024/

Every Wunder lesson is built from real, reputable sources — never invented.

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