* 1986 – Carbon dioxide gas erupts from volcanic Lake Nyos in Cameroon, killing up to 1, 800 people within a 20-kilometer range.

* from Lake Nyos, August 21, 1986, killing as many as 1800

* Lake Nyos

* August 21 – The Lake Nyos disaster occurs in Cameroon, killing nearly 2, 000 people.

A cow suffocated by gases from Lake Nyos after a limnic eruptionA limnic eruption occurs when a gas, usually CO < sub > 2 </ sub >, suddenly erupts from deep lake water, posing the threat of suffocating wildlife, livestock and humans.

* At nearby Lake Nyos in 1986 a much larger eruption killed between 1, 700 and 1, 800 people by asphyxiation.

Lake Nyos is a crater lake in the Northwest Region of Cameroon, located about northwest of Yaoundé.

Nyos is one of only three known exploding lakes to be saturated with carbon dioxide in this way, the others being Lake Monoun, away SSE, and Lake Kivu in Democratic Republic of Congo.

On August 21, 1986, possibly as the result of a landslide, Lake Nyos suddenly emitted a large cloud of CO < sub > 2 </ sub >, which suffocated 1, 700 people and 3, 500 livestock in nearby towns and villages.

Lake Nyos lies within the Oku Volcanic Field, located near the northern boundary of the Cameroon Volcanic Line, a zone of volcanoes and other tectonic activity that extends southwest to the Mt.

Lake Nyos is located south of the dirt road from Wum, about to the west, to Nkambé in the east.

Lake Nyos fills a roughly circular maar in the Oku Volcanic Field, an explosion crater caused when a lava flow interacted violently with groundwater.

Lake Nyos is surrounded by old lava flows and pyroclastic deposits.

A magma chamber beneath the region is an abundant source of carbon dioxide, which seeps up through the lake bed, charging the waters of Lake Nyos with an estimated 90 million tonnes of CO < sub > 2 </ sub >.

Lake Nyos is thermally stratified, with layers of warm, less dense water near the surface floating on the colder, denser water layers near the lake's bottom.

Lake Nyos as it appeared fewer than two weeks after the eruption ; August 29, 1986.

A cow suffocated by gases from Lake Nyos

Although a sudden outgassing of CO < sub > 2 </ sub > had occurred at Lake Monoun in 1984, killing 37 local residents, a similar threat from Lake Nyos was not anticipated.

However, on August 21, 1986, a limnic eruption occurred at Lake Nyos which triggered the sudden release of about 1. 6 million tonnes of CO < sub > 2 </ sub >; this cloud rose at nearly.

France | French scientists working on degassing Lake Nyos

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