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Originally posted by Wrathier
Totally off topic: If this
www.guardian.co.uk...
Is the general intelligence of Americans... Americans is screwed big time if yellowstone blows.
Sorry to all my freinds and "colleques" from America in here. (just kidding but really try to read it...)
Originally posted by manotick
reply to post by Wrathier
The story was posted on page 386
Originally posted by xoxo stacie
If you look at the Of geysers you can totally tell that the composition of the "waters" has changed based soley on the color of the "steam clouds" once a large amount of evaporation has taken place.
Extracts from en.wikipedia.org...
The Toba eruption (the Toba event) occurred at what is now Lake Toba about 67,500 to 75,500 years ago. It had an estimated Volcanic Explosivity Index of 8 (described as "mega-colossal"), making it possibly the largest explosive volcanic eruption within the last two million years, greater than the Island Park Caldera supereruption (2500 cubic km) of 2.1 million years BP.
Bill Rose and Craig Chesner of Michigan Technological University have deduced that the total amount of erupted material was about 2800 cubic km (670 cubic miles) Around 2000 cubic km of ignimbrite that flowed over the ground, and around 800 cubic km that fell as ash, with the wind blowing most of it to the west. The pyroclastic flows of the eruption destroyed an area of 20,000 square km (7700 square miles), with ash deposits as thick as 600 metres (2000 feet) by the main vent. By contrast, the 1980 eruption of Mount St. Helens ejected around 1.2 cubic km of material, whilst the largest volcanic eruption in historic times, at Mount Tambora in 1815, emitted the equivalent of around 100 cubic km of dense rock and created the "Year Without a Summer" as far away as North America. The eruption was also about three times the size of the latest Yellowstone eruption of Lava Creek 630,000 years ago.
To give an idea of its magnitude, consider that although the eruption took place in Indonesia, it deposited an ash layer approximately 15 cm (6 inch) thick over the entire Indian subcontinent; at one site in central India, the Toba ash layer today is up to 6 m (20 ft) thick[9] and parts of Malaysia were covered with 9 m of ashfall.[10] In addition it has been calculated that 1010 metric tons of sulphuric acid was ejected into the atmosphere by the event, causing acid rain fallout.[11]
Landsat photo of Sumatra surrounding Lake TobaThe subsequent collapse formed a caldera that, after filling with water, created Lake Toba. The island in the center of the lake is formed by a resurgent dome.
Some parts of the caldera have experienced uplift due to partial refilling of the magma chamber, for example pushing Samosir Island and the Uluan Peninsula above the surface of the lake. The lake sediments on Samosir Island show that it has been uplifted by at least 450 metres since the cataclysmic eruption. Such uplifts are common in very large calderas, apparently due to the upward pressure of unerupted magma. Toba is probably the largest resurgent caldera on Earth. Large earthquakes have occurred in the vicinity of the volcano more recently, notably in 1987 along the southern shore of the lake at a depth of 11 km. Other earthquakes have occurred in the area in 1892, 1916, and 1920-1922.
Lake Toba lies near a fault line which runs along the centre of Sumatra called the Sumatra Fracture Zone.
Originally posted by Hx3_1963
Now what's up with this swarm building in Nevada & Utah?
I know I've mentioned a "Trend" going back up W Cali into Nevada but Utah? Idaho next?
[edit on 1/19/2009 by Hx3_1963]
Originally posted by PuterMan
It sort of makes Yellowstone look like a baby!!