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// ENTITY_RECORD  //  TYPE: PERSON

Haraldur Sigurdsson

// OVERVIEW

Nexor's dispatch on the Lake Nyos disaster identifies Haraldur Sigurdsson as an Icelandic-American volcanologist affiliated with the University of Rhode Island who investigated the 1984 Lake Monoun event. According to the broadcast, Sigurdsson identified CO2 accumulation as the mechanism behind that earlier mass casualty incident and published findings accordingly. The dispatch notes that his paper was initially rejected by Science magazine, and that when it was eventually published, his warning preceded the catastrophic Lake Nyos eruption by only two months — framing his work as an early, largely unheeded alert to the lethal potential of crater lake gas dynamics.

// 1 APPEARANCES IN THE ARCHIVE

How Lake Nyos Killed 1,746 People in One Breath — and Why Lake Kivu Could Do It at 250 Times the Scale
// FILE
2026-04-17

How Lake Nyos Killed 1,746 People in One Breath — and Why Lake Kivu Could Do It at 250 Times the Scale

On the night of August 21, 1986, Lake Nyos in northwestern Cameroon released an estimated 1.2 cubic kilometers of dissolved carbon dioxide in approximately 20 seconds, suffocating 1,746 people in the surrounding villages. The phenomenon — a limnic eruption — was unknown to science until 1984. A degassing solution existed within years, but took 15 years to fund. Lake Kivu, 55 miles long and holding 250 times the CO2 of Nyos, remains only partially addressed.

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