Volcano ash cloud covers 400 miles Dave Schneider, a U.S. Geological Survey geophysicist with the Alaska Volcano Observatory, is shown at the operations center Tuesday, March 29, 2016, in Anchorage, Alaska. (AP Photo/Mark Thiessen/Colt Snapp via AP)
Volcano ash cloud covers 400 miles
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Strong winds March 28 pushed an ash cloud from an Alaska volcano into the heart of the state, grounding flights and limiting travel to western and northern communities off the road system.
 
Pavlof Volcano, one of Alaska's most active volcanoes, is 625 miles southwest of Anchorage on the Alaska Peninsula, the finger of land that sticks out from mainland Alaska toward the Aleutian Islands.
 
The volcano in the 8,261-foot mountain erupted about 4 p.m. March 27, spitting out an ash cloud that rose to 20,000 feet.
 
Lightning over the mountain and pressure sensors indicated eruptions continued overnight.  By 7 a.m. March 28, the ash cloud had risen to 37,000 feet and winds to 50 mph or more had stretched it over more than 400 miles into interior Alaska.
 
"It's right in the wheelhouse of a lot of flights crisscrossing Alaska," said geologist Chris Waythomas, of the U.S. Geological Survey, part of the Alaska Volcano Observatory, along with the University of Alaska and the state Division of Geological and Geophysical Surveys.
 
Volcanic ash is angular and sharp and has been used as an industrial abrasive. The powdered rock can cause a jet engine to shut down so some flights were canceled. USGS geologists have compared it to flying into a sand blaster.
 
An eruption of Mount Redoubt in December 1989 sent out an ash cloud 150 miles that flamed out the jet engines of a KLM flight carrying 231 passengers to Anchorage. The jet dropped more than two miles before pilots were able to restart the engines and land safely.
 
"We just simply will not fly when ash is present," Egan said.
 
Waythomas had received no reports of ash falling in communities. The closest community, Cold Bay, is 37 miles southwest of the volcano, opposite of where the wind was blowing ash.
 
Geologists call Pavlof an open-system volcano, Waythomas said.
 
"The pathways that magma follows to the surface are pretty open in a volcanological sense," Waythomas said. "They can convey magma and gas very easily. Magmas can move to the surface whenever they feel like it, more or less."
 
The movement comes with little shaking of the ground, and the lack of earthquakes as an early warning of an eruption "makes us go crazy monitoring them," Waythomas said.
 
The volcano, about 4.4 miles in diameter, has had 40 known eruptions. Its conical, nearly symmetrical shape indicates its eruptions tend to be less violent than the kind that blows tops off mountains.
 
"It can erupt for periods of hours to days or it can go on for much longer periods of time," Waythomas said. "It won't erupt continuously for many months or a year. It will be intermittent. But the eruption cycle could go on for a while, or it could abruptly shut off and be done tomorrow."
 
The USGS raised the volcano alert to its highest level, which warns of hazards both in the air and on the ground.

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CRITICAL THINKING QUESTION
Volcanic ash poses a hazard to jet engines. What other hazards does it create?
Write your answers in the comments section below


COMMENTS (45)
  • hadleyr-
    4/05/2016 - 11:06 a.m.

    Volcanic ash does cause problems with airplanes, but I think it can cause problems with cars, breathing, long distance sight, or even pollute the water. I would recommend staying inside until the ash as settled.

  • TehyaWhite-Ste
    4/06/2016 - 01:04 p.m.

    It creates a health hazard as the citizens of the town breathe the air in. They then get volcanic ash and other debris in their lungs.

  • mackenzieg11-col
    4/06/2016 - 03:33 p.m.

    Volcanic ash creates hazards such as inhaling the dust from the ash which is harmful to our lungs. Which could cause health problems and maybe even lead to death. The volcanic ash is also angular and sharp which could cause other problems such a scratched and torn up plants and structures in the area.

  • briannec-ste
    4/13/2016 - 02:15 p.m.

    The ash is traveling a very long way from the volcano.I think this is very bad for the engines because it would reduce the efficiency of the engine.

  • jacih-fel
    5/06/2016 - 02:12 p.m.

    It creates a health hazard as the citizens of the town breathe the air in. They then get volcanic ash and other debris in their lungs.

  • coled-fel
    5/06/2016 - 02:13 p.m.

    Another hazard it will create is that people will die. That's really about it.

  • lucasp-fel
    5/06/2016 - 02:13 p.m.

    volcanic ash creates hazards to cars, water. you also cant breath

  • garretta-fel
    5/06/2016 - 02:14 p.m.

    It can block out the sun which would result in a volcanic winter, and would destroy crops which would harm our food supply.

  • elizabetht-fel
    5/06/2016 - 02:14 p.m.

    Volcanic ash not only poses a threat and hazard to jet engines, it also can adversely affect human health and the environment around it.

  • callans-fel
    5/06/2016 - 02:14 p.m.

    Volcanic ash can also pose a problem for plant growth and human health. The ash can kill the plants, so, less food, less things to eat. So, human will also have water with ash in it(ew).

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