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Posted by: Saving Water SA (Cape Town, South Africa) – partnered with Water Rhapsody conservation systems – 12 July 2011 Scientists from British Antarctic Survey (BAS) have discovered previously unknown volcanoes in the ocean waters around the remote South Sandwich Islands. Using ship-borne sea-floor mapping technology during research cruises onboard the RRS James Clark [...] Posted by: Saving Water SA (Cape Town, South Africa) – partnered with Water Rhapsody conservation systems – 02 November 2010 When Mount St. Helens blew its top in 1980, it wasn’t a surprise that it happened, but even today the extent of the damage is hard to fathom. The eruption knocked down 100-foot trees [...] Posted by: Saving Water SA (Cape Town, South Africa) – partnered with Water Rhapsody conservation systems – 03 August 2010 A new study has found that a mixing of two different types of magma is the key to the historic eruptions of Mount Hood, Oregon’s tallest mountain, and that eruptions often happen in a relatively short time – weeks or months – after this mixing occurs.  Mount Hood is the highest mountain in Oregon at 3429 metres This behavior is different from that of most other Cascade Range volcanoes, including Mount Hood’s nearby, more explosive neighbor, Mt. St. Helens. The research results are reported this week in the journal Nature Geoscience by geologists from Oregon State University (OSU) and the University of California at Davis, in work supported by the National Science Foundation (NSF). “These results clarify details of the processes that trigger Mount Hood eruptions,” said Sonia Esperanca, program director in NSF’s Division of Earth Sciences, which funded the research. “Similar triggering processes may occur in several of Earth’s most active volcanoes.” “The data will help give us a better road map to what a future eruption on Mount Hood will look like, and what will take place before it occurs,” said Adam Kent, a geoscientist at OSU. “It should also help us understand the nature of future eruptions and what risks they will entail.” Continue reading Mixing magma holds key to historic eruptions Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 22 April 2010 For all the worldwide chaos that Iceland’s volcano has already created, it may just be the opening act.  A column of steam and ash rises from the volcano near Eyjafjallajokull Photo: REUTERS Scientists fear tremors at the Eyjafjallajokull volcano could trigger an even more dangerous eruption at the nearby Katla volcano – creating a worst-case scenario for the airline industry and travellers around the globe. A Katla eruption would be 10 times stronger and shoot higher and larger plumes of ash into the air than its smaller neighbour, which has already brought European air travel to a standstill for five days and promises severe travel delays for days more. The two volcanoes are side by side in southern Iceland, about 20km apart, and thought to be connected by a network of magma channels. Katla, however, is buried under ice 500m thick – the massive Myrdalsjokull glacier, one of Iceland’s largest. That means it has more than twice the amount of ice than the current eruption has burned through, threatening a new and possibly longer aviation standstill across Europe. Katla showed no signs of activity yesterday, according to scientists who monitor it with seismic sensors, but they were still wary. Pall Einarsson, professor of geophysics at the Institute of Earth Sciences at the University of Iceland, said one volcanic eruption sometimes causes a nearby volcano to explode, and Katla and Eyjafjallajokull have been active in tandem in the past. In fact, the last three times that Eyjafjallajokull erupted, Katla did as well. Katla also typically awakens every 80 years or so, and having last exploded in 1918, it is now slightly overdue. Continue reading Iceland’s volcanic eruption may just be the opening act Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 21 April 2010 The volcanic ash cloud from the Icelandic volcano is not expected to have an impact on global temperatures. Photo by Sverrir Thor under Ceative Commons licence 2.0 The volcano, located under the Eyjafjallajokull glacier [...] |
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