1831 CE mystery eruption - Zavaritskii caldera, Simushir Island (Kurils)

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In 1831, a significant volcanic eruption led to a nearly 2 degrees Fahrenheit (1.1 degrees Celsius) cooling in the Northern Hemisphere, causing widespread climate disruption. This event, previously attributed to an unknown source, has now been traced to the Zavaritski volcano on Simushir Island in the Kuril Islands of Russia. The Zavaritski Caldera, which features three nested calderas, was identified as the source of the eruption, with ash from this event found in polar ice cores. This discovery resolves a nearly 200-year-old mystery regarding the cause of the global cooling phenomenon linked to the eruption.
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Cataclysmic 1831 Eruption Traced to Quadruple Volcano on Abandoned Soviet Island​

https://gizmodo.com/cataclysmic-183...volcano-on-abandoned-soviet-island-2000608193

In 1831, the Northern Hemisphere cooled by nearly 2 degrees Fahrenheit (nearly 1.1 degrees Celsius), throwing the climate into disarray and painting skies strange hues. Scientists long suspected a massive volcanic eruption was to blame, but its source remained unknown—until now. The recent study revealed that Zavaritski, Simushir’s relatively modest 2,047-foot (624-meter) volcano was the culprit. Ash from the eruption was later found in polar ice cores, solving the nearly 200-year-old mystery of which volcano triggered the global cooling.

The 1831 CE mystery eruption identified as Zavaritskii caldera, Simushir Island (Kurils)​

https://www.pnas.org/doi/10.1073/pnas.2416699122

Zavaritski Caldera
https://volcano.si.edu/volcano.cfm?vn=290180

https://en.wikipedia.org/wiki/Zavaritski_Caldera - the Zavaritsi Caldera (Russian: Вулкан Заварицкого, Vulkan Zavaritskogo), also spelled "Zavaritskii" and "Zavaritsky", is a caldera system located in the center of Simushir island, in the central Kuril Islands, Russia. The Zavaritski volcano contains three nested calderas, measuring 3 kilometres (2 miles), 8 km (5 mi) and 10 km (6 mi) in diameter.
https://en.wikipedia.org/wiki/Zavaritski_Caldera#1831_eruption
 
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