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volcano Redoubt - ash

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Description

Origin : Alaska (USA)

Size : vial mm 44 x 10 diam.


volcanic ash sample erupted from Mount Redoubt volcan in Alaska, collected horty after eruption, in April 2009.
Rare collection of extremely fine grained volcanic ash from Redoubt eruption in March 22, 2009. This is finer grained ash than Mount St. Helen's ample.
Volcanic ash consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions, less than 2 millimetres (0.1 inch) in diameter . Ash is created when the usually violent nature of an eruption involving steam results in the magma and solid rock surrounding the vent being torn into particles of clay to sand size.
Every ash samples is labelled and bagged in a vial with cap (mm 44 x 10), so thay can easily be removed if required for study under a microscope.
As with all volcanic ash, the material should be handled with care and not inhaled.



Mount Redoubt or Volcano Redoubt is an active stratovolcano and the highest relief (3108 m s.l.m.) of the Alaska peninsula. It lies 180 km southwest of Anchorage and is in the vast volcanic range of the Aleutians of the US state of Alaska. Located at the top of the Chigmit Mountains in the Lake Clark National Park and Preserve, the mountain is located west of Cook Inlet on the Kenai Peninsula, about 110 miles southwest of Anchorage.
The official name of the mountain is such since 1981, deriving from a translation of a local term that means "fortified place".
The volcano has a diameter of about 6 km at the base with an approximate volume of about 35 cubic km. The sides of the upper cone are relatively steep compared to the volcanoes in general, consisting of pyroclastic flow deposits and lava flows, and rests on Mesozoic rocks of the batolito of the Aleutian mountain range. The mountain has also been altered by the movement of several glaciers that reside there. This mountain produced andesite, basalt and dacite.
Active for millennia (its rocks have been calculated to be 890,000 years old), Mount Redoubt has burst four times since these events were first observed: in 1902, in 1966, in 1989 and in 2009, with two eruptions questionable in 1881 and 1933. The eruption in 1989 vomited a column of volcanic ash up to a height of 14,000 m, incorporating a Boeing 747 in its plume. After the plane dropped to 13,000 feet, the pilots restarted the engines and landed the plane safely in Anchorage. The ash fallout has covered an area of ​​about 20,000 km². This eruption is also famous because it was the first eruption accurately predicted by geologists with the method of long-term seismic events.
On January 30, 2009, the Alaska Volcano Observatory announced a new and imminent eruption, which on March 22nd at 10:30 pm local time came with a first major explosive eruption followed by five more in the following hours. The alarm of the local authorities has been brought to the highest level. The column of ashes has risen up to over 15 km in height. Air traffic in the region was blocked, while at the same time they feared important mud flows (lahar) along the north flank of the mountain, as the entire mountain is covered by a thick snowpack, which in contact with the pyroclastic flows and dome collapses instantly dissolves.
The eruption continued until July 2009. The gaseous material expelled from the volcano along with the ash consisted mainly of water vapor, along with small amounts of carbon dioxide and sulfur dioxide. A further study conducted by air monitors suggests that the materials were not very oxidized and that a small part of the concentration contained sulfates, less than 20%.



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