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Namafjall is a geothermal area with boiling mudpools and steaming fumaroles. It is part of the Krafla caldera which is about 10 km (6mi.) in diameter with a 90 km (56mi.) long fissure zone in the Mývatn region.
The geothermal area Krýsuvík is situated on the Reykjanes peninsula in Iceland. It is in the south of Reykjanes in the middle of the fissure zone on the Mid-Atlantic Ridge which traverses Iceland diagonally from the south-west to the north-east of the island.
Krýsuvík is one of Iceland's high temperature areas. This becomes visible through the sulphur springs and hot springs at Seltún and another similar area nearby.
South of the Krafla area, but not actually within the caldera is Námafjall, a mountain, beneath which is Hverir, a geothermal area with boiling mudpools and steaming fumaroles
Hverfjall Crater was created during a short but powerful eruption some 2,800 years ago. The area formed the southernmost part of an eruptive fissure, as molten magma rose through this fissure it met the waters of a lake, causing a phreatomagnetic explosion. The ensuing blast produced a wide crater of ash and pumice. Measuring nearly 1 mile (1.6 km) wide. Hverfjall's cinder cone rises to 656 feet (200 m). All around lies evidence of the turmoil steaming beneath the surface: the eruptions of the 1720's and the Krafla volcanic fires of the 1970's left the adjacent landscape littered with fumaroles and bubbling mudpools.
Krafla is a caldera of about 10 km in diameter with a 90 km long fissure zone, in the north of Iceland in the Mývatn region. Its highest peak reaches up to 818 m.
Krafla includes one of the two best known Víti craters of Iceland, the second is part of Askja. The Icelandic word "víti" means "hell". In former times, people often believed Hell to be under volcanoes. The crater Víti has a green lake inside of it.
The Krafla area also includes Námafjall, a geothermal area with boiling mudpools and steaming fumaroles.
(from Wikipedia)
Uzon caldera (9 x 12km) was formed about 40000 years ago following a series of eruptions of a volcano. It is now a stunning landscape (particularly against the back drop of Autumn colours) dotted with geothermal activity such as these fumaroles/mud pools.
In Yellowstone National Park. According to the sign, "This vat of bubbling mud contains the perfect mix of ingredients to create mudpots: heat, gases, water, volcanic rock, minerals, acid, and even living microorganisms! Heat-loving "thermophiles" consume some of the gases and help convert them into sulphuric acid. The acid breaks down rock to form clay -- clay that mixes with water in mudpots."
"Year after year, this huge mudpot -- called "Mammoth Paint Pots" until 1927 -- has changed with the seasons. Fountain Paint Pot spits thin, sloppy mud in spring. In drier conditions, thick bubbles of mud and gas ooze through cracks, then burst and collapse, forming cone-shaped mounds."
VULCANO MUD POOLS BEAUTY TREATMENT
Your skin will feel beautiful after this but it will smell rather nasty and sulphurous!
Mudpools form in places where thermal fluids have chemically decomposed surface rocks to form clay. This clay is heated by the underground energy source and boiling mud pools are created. Activity tends to vary from season to season, depending on the varying amounts of rain to moisten or dry the mud. Accordingly, mud pools generally appear more active in winter than summer.