Jupitersterrain 5

In January, 2008, the British Antarctic Survey  scientists led by Hugh Corr and David Vaughan, reported in the journal Nature Geoscience that 2,200 years ago, a volcano erupted under Antarctica ice sheet (based on airborne survey with radar images). The biggest eruption in the last 10,000 years, the volcanic ash was found deposited on the ice surface under the Hudson Mountains, close to Pine Island Glacier.

It is possible to track catastrophic subglacial volcano eruptions in time with the analysis of ice cores such as the Vostok core. Subglacial volcanic eruptions are identified by layers of high concentrations of NO−3 and SO2-

14.51, 17.08.12. 

Large, explosive volcanic eruptions inject water vapor (H₂O),(CO₂),  (SO₂), (HCl),  (HF) and ash (pulverized rock and pumice) into the stratosphere to heights of 16–32 kilometres above the Earth's surface. The most significant impacts from these injections come from the conversion of sulfur dioxide to sulfuric acid (H₂SO₄). These increase the Earth's albedo—its reflection of radiation from the Sun back into space


17.08.12.  3.07.12.


Lava domes are built by slow eruptions of highly viscous lavas. They are sometimes formed within the crater of a previous volcanic eruption (as in Mount Saint Helens), but can also form independently, as in the case of Lassen Peak. Like stratovolcanoes, they can produce violent, explosive eruptions. Unlike most lava domes, Lassen Peak is topped by craters. A set of these craters exists around the summit of Lassen Peak, although two of them have been covered up by solidified lava and sulfur deposits  

On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated nearby areas, and volcanic ash rained down as far as 300 km. This explosion was the most powerful in a series of eruptions from 1914 through 1917. Lassen Peak and Mount St. Helens – which had a massive eruption in 1980 – are the only two volcanoes in the continental United States to erupt during the 20th century. Lassen Volcanic National Park was created in Shasta County, Calif., to preserve the devastated areas as they were, for future observation and study, and to preserve the nearby volcanic features

14.11, 17.08.12. 

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