（There is little evidence that a landslide or an earthquake initiated the event. Instead, many scitentists believe that the rapid accumulation of rainwater in the lake was responsible for overturning the bottom waters).
Energy Eduacation Although the source is well agreed upon, the actual cause of the gas release is still debated. The possibility of a volcanic eruption were ruled out upon studying the chemical composition of the lake, along with other factors. One theory suggests a landslide within the lake, while others attribute a slow influx of heat as the cause of an instability leading to release.[3] In general, a gradual heating of the depths of the lake is widely accepted as the cause for the large gas release.[6] http://energyeducation.ca/encyclopedia/Lake_Nyos Geo udsu IThere is little or no evidence that a landslide or an earthquake initiated the event. Instead, many scientists believe that the rapid accumulation of rainwater in the lake was responsible for overturning the bottom waters. The rainwater may have been blown to one side of the lake by strong August winds. Being denser than the warmer lake water, the rainwater mass would have descended down one side of the lake, thus displacing the bottom waters. This convective overturn resulted in the ascent and decompression of the bottom water, thus causing the dissolved gas to come out of solution (exsolve) and bubble upward at dramatic speeds. The bubbles themselves may have lowered the overall density of the gas-water mixture resulting in even greater rates of ascent, decompression, and exsolution. The result was a rapid and violent EXPULSION of CO2. So much gas escaped from this single event, that the surface level of Lake Nyos dropped by an entire meter. http://www.geology.sdsu.edu/how_volcanoes_work/Nyos.html Google Scholar https://www.sciencedirect.com/science/article/pii/S0377027399001791
未解之谜太多了。说一个离我们生活比较接近的。
Lake Nyos，是一个非洲的湖泊，也是地理学界一个著名的湖泊。这个湖不是很大，不是很美，但是一夜之间杀了住在湖泊周围两个小镇的1700余名居民和3500多头牲畜。
Lake Nyos是由自然侵蚀而形成的湖泊，湖底便是冷却的岩浆，也就是岩浆岩和沉积岩为主。这些岩石中含大量的二氧化碳，千百年来二氧化碳缓慢的溶入水中，由于重力和密度，二氧化碳沉积在湖底，几近饱和。
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