Late Volcanic Activity
After termination of active volcanic eruptions, any volcano continues to produce for a long time various gas, containing water vapour, sulfur, and other elements heated up to 650°C.
The most spectacular demonstrations are the geysir and the volcanic lakes.
As the time goes, aging volcanoes stop releasing hot water and gas. Water fills in the crater making a lake, which is sometimes named the
Crater Lake (USA).
On the Flores Island in Indonesia, there are three lakes with water of various colour in the caldera of the Keli Mutu Volcano. Water is of dark to dark red and almost black colour in the Tivoe Ata Polo, a lake of bewitched people. It is of matt emerald-green colour in the Tivoe loza Mocri Koo Fay, a lake of boys and girls. It is bright green transparent and pure in the Tivoe Ata Mboepoe Lake. The water colour of these lakes depends on its varying mineralization: in the first case it is with iron oxide; it has high concentration of sulfur and chlorine in the form of acids in two other lakes.
Such colours are wide spread in volcanic lakes and this indicates that volcano is not quite extinct: it continues to release mineralized water and gas into lake water.
Last modified: Lunedì 7 novembre 2016