the black death
Limnic eruption
A limnic eruption is a very rare natural disaster and also known as a lake turnover it is when there is a sudden release of inflammable gases (usually carbon dioxide) from a maar which is a lake in the crater of an extinct volcano, which is saturated with carbon dioxide from underlying magma reservoirs. A limnic eruption is a Geomorphological hazard because the occurrence of the eruption takes place first starting within the earth from the underlying magma reservoir. It is very rare natural disaster, so rare there have only ever been two historic recordings both taking place in Cameroon, Africa.
Occurrences of limnic eruptions
There have only been two historically recorded limnic eruptions in the world the first took place in 1984 at Lake Monoun, in Cameroon, Africa causing the death of 37 persons. The second took place in 1986 at Lake Nyoas, in Cameroon, Africa taking the lives of 1700-1800 people.
Causes of a Limnic eruption
As there have only ever been two historically recorded eruptions scientists and geologists can only make educated guesses as to what may be the cause. Scientists believe that the physical attributes of a limnic eruption may be triggered by another event such as an earthquake or volcanic eruption.
For a limnic eruption to occur, the lake must be nearly saturated with carbon dioxide and other gases. This can be caused by volcanic gas emitted from under the lake or from decomposition of organic material. In the two known cases, the major component was carbon dioxide. The perfect conditions for the carbon dioxide to mix with the water faster, is deep water, for more pressure and cooler water conditions.
Once the lake is completely saturated all it needs is a trigger. The believed trigger is an actual volcanic eruption, an earthquake, or even wind and rain storms. We don’t know how the gas is emitted from the lake because it is invisible to the human eye and extremely lethal.
Impacts on Humans and the natural
A limnic eruption is a very rare natural disaster and also known as a lake turnover it is when there is a sudden release of inflammable gases (usually carbon dioxide) from a maar which is a lake in the crater of an extinct volcano, which is saturated with carbon dioxide from underlying magma reservoirs. A limnic eruption is a Geomorphological hazard because the occurrence of the eruption takes place first starting within the earth from the underlying magma reservoir. It is very rare natural disaster, so rare there have only ever been two historic recordings both taking place in Cameroon, Africa.
Occurrences of limnic eruptions
There have only been two historically recorded limnic eruptions in the world the first took place in 1984 at Lake Monoun, in Cameroon, Africa causing the death of 37 persons. The second took place in 1986 at Lake Nyoas, in Cameroon, Africa taking the lives of 1700-1800 people.
Causes of a Limnic eruption
As there have only ever been two historically recorded eruptions scientists and geologists can only make educated guesses as to what may be the cause. Scientists believe that the physical attributes of a limnic eruption may be triggered by another event such as an earthquake or volcanic eruption.
For a limnic eruption to occur, the lake must be nearly saturated with carbon dioxide and other gases. This can be caused by volcanic gas emitted from under the lake or from decomposition of organic material. In the two known cases, the major component was carbon dioxide. The perfect conditions for the carbon dioxide to mix with the water faster, is deep water, for more pressure and cooler water conditions.
Once the lake is completely saturated all it needs is a trigger. The believed trigger is an actual volcanic eruption, an earthquake, or even wind and rain storms. We don’t know how the gas is emitted from the lake because it is invisible to the human eye and extremely lethal.
Impacts on Humans and the natural
Bibliography: http://en.wikipedia.org/wiki/Limnic_eruption http://voices.yahoo.com/what-causes-limnic-eruption-5442971.html?cat=58 http://www.design4disaster.org/disasters-2/natural-disasters/limnic-eruption/ http://geol105naturalhazards.voices.wooster.edu/limnic-eruptions/ http://uwsslec.libguides.com/content.php?pid=157397&sid=1332661 http://historyofgeology.fieldofscience.com/2010/08/august-121986-lake-nyos-catastrophe.html You tube: Limnic eruptions – ladies weather.