http://gallery.usgs.gov/ en-us A list of photography and images from the U.S. Geological Survey's Multimedia Gallery (http://gallery.usgs.gov). http://gallery.usgs.gov/images/USGS.gif http://gallery.usgs.gov/ In 1986, Lake Nyos, in the volcanic region of Cameroon, released a cloud of CO₂ into the atmosphere, killing 1,700 people and 3,500 livestock in nearby towns and villages. Since then, engineers have been artificially removing the gas from the lake through piping. This photo shows the Lake Nyos pipe in operation. The 200-meter-long pipe is suspended from the raft and allows gas-rich water from the lake bottom to vent to the surface, where the CO₂ dissipates into the atmosphere at a controlled rate. The shed on the control raft is about 6 feet high and the fountain is about 120 feet high. There are no pumps involved because the CO₂ drives the fountain, just like a shaken bottle of champagne.

]]> wcevans - at - usgs.gov (Bill Evans) http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_0 http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_0 Mon, 6 Feb 2012 00:00:00 EDT Cameroon Africa Monitoring CarbonDioxide Volcano LakeNyos In 1986, Lake Nyos, in the volcanic region of Cameroon, released a cloud of CO₂ into the atmosphere, killing 1,700 people and 3,500 livestock in nearby towns and villages. Since then, engineers have been artificially removing the gas from the lake through piping. The gas burst in 1986 from the 200-meter deep Lake Nyos was so violent that water washed over the 80-meter high promontory in the foreground.

]]> Jack Lockwood http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_1 http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_1 Mon, 6 Feb 2012 00:00:00 EDT Cameroon Africa Monitoring CarbonDioxide Volcano LakeNyos In 1986, Lake Nyos, in the volcanic region of Cameroon, released a cloud of CO₂ into the atmosphere, killing 1,700 people and 3,500 livestock in nearby towns and villages. Since then, engineers have been artificially removing the gas from the lake through piping. A small CO₂ cloud from Lake Monoun killed 37 people in 1984.

]]> wcevans - at - usgs.gov (Bill Evans) http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_2 http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_2 Mon, 6 Feb 2012 00:00:00 EDT Cameroon Africa Monitoring CarbonDioxide Volcano LakeNyos In 1986, Lake Nyos, in the volcanic region of Cameroon, released a cloud of CO₂ into the atmosphere, killing 1,700 people and 3,500 livestock in nearby towns and villages. Since then, engineers have been artificially removing the gas from the lake through piping. This photo shows a pipe top and raft at Lake Nyos. The self-driven fountain (inset) can reach a height of 150 feet above the lake surface while dissipating carbon dioxide.

]]> wcevans - at - usgs.gov (Bill Evans) http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_3 http://gallery.usgs.gov/photos/02_06_2012_qvm8PCb54J_02_06_2012_3 Mon, 6 Feb 2012 00:00:00 EDT Cameroon Africa Monitoring CarbonDioxide Volcano LakeNyos