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Wavering Ash Emissions At Semisopochnoi Volcano Prompt Fluctuations In AVO Alert Levels


Credit Courtesy of the Alaska Volcano Observatory
Scientists have downgraded the alert level for an Aleutian volcano that began showing an increase in signs of eruption and emitting harmful ash late last week. 
According to Dave Schneider, a geophysicist with the Alaska Volcano Observatory, over the last several weeks, satellites and pressure sensor data revealed ramped up activity at Semisopochnoi Volcano, which is located on an uninhabited island in the Rat Islands about 600 miles southwest of Unalaska. 
Scientists detected steady ash emissions coming from the volcano Thursday, prompting them to upgrade the aviation color code to red and alert level to warning. ....

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