Sunday, February 1, 2009
Will Redoubt give us another spectacular eruption or will it remind us the volcanos powerful forces. December 1989 and April 1990 the stratovolcano gave us a shake that was just breathtaking. Now scientists from the Alaska Volcano Observatory warned that an eruption was imminent.
From the past Redoubt's eruptions are generally explosive and produce lava flows as well as pyroclastic flow. Extremely explosive eruptions sends large quantities of ash high into the stratosphere. Redoubt is also known for it’s large tephra plume of volcanic ash that have reached altitudes of 7 to 12km. Minerals within volcanic ash are primarily derived from the magma.
The type of minerals within an ash deposit depends upon the chemistry of the magma from which it was erupted. Typical minerals by magma composition consists of CaO, SiO2, MgO, Al2O3, FetO3, Na2O, and S. Some metals including Mn, Ba, V, Zr Cu, Sr, and Zn may be present. Most minerals in ash will affect the composition of soil in the long term, possibly affecting livestock and agriculture. High values of allophane, organic C, Fe, Al, and Mn have been reported in glacial sediments. These minerals crystalized and grow within the magma.
Ash particles can be so fine that they are breathed deep into the lungs. Common symptoms are: airway irritation, hacking cough, chest complaints, Nasal irritation and discharge, wheezing, or shortness of breath. Breathing becomes uncomfortable, burning of the eyes, photosensitivity, eyes becoming painful, itchy or bloodshot. Acute conjunctivitis, sticky discharge or tearing.
So if Redoubt erupts take some precautions, refrain from driving and stay indoors if possible,
wear goggles or corrective eyeglasses, wear effective dust masks or a fabric mask from cloth, dampening the fabric with water will improve its effectiveness. Keep all doors and windows closed whenever possible. Plus with the media we have today, just sit back and watch the event on TV.
It's Gonna Be Bedlam