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Home World News Us & Canada

Volcano near Alaska’s largest city could erupt in coming weeks or months: Scientists

March 12, 2025
in Us & Canada
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Volcano near Alaska's largest city could erupt in coming weeks or months: Scientists
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ANCHORAGE, Alaska — A volcano near Alaska’s largest city is showing new signs of unrest, with experts saying the likelihood of an eruption at Mount Spurr in the next few weeks or months has increased.

The Alaska Volcano Observatory said Wednesday that it had measured during recent overflights “significantly elevated volcanic gas emissions,” and said signs indicated an eruption was likely, though not certain, in the weeks or months ahead.

“We expect to see further increases in seismic activity, gas emissions and surface heating prior to an eruption, if one were to occur,” the observatory said in a statement. “Such stronger unrest may provide days to weeks of additional warning.”

It is an 11,070-foot (3,374-meter) tall, ice- and snow-covered volcano roughly 80 miles (129 kilometers) northwest of Anchorage.

Mount Spurr is one of 53 volcanoes in Alaska that have been active within the last 250 years. It has two main vents.

The last known eruption from the summit vent was more than 5,000 years ago. The Crater Peak vent, meanwhile, erupted once in 1953 and three times in 1992, according to the observatory. The Crater Peak vent is about 2 miles (3 kilometers) south of the summit.

There have been periods of increased earthquake or other activity since then, including between 2004 and 2006, but no other eruptions. Last October, the observatory raised its alert status for Mount Spurr from green to yellow when an increase in seismic activity became pronounced and a ground deformation was spotted in satellite data.

The most likely outcome of the current unrest would be an eruption or eruptions similar to those in 1953 and 1992, the observatory said.

However, “It is also possible that no eruption occurs and the present activity slowly dies away or that a smaller eruption takes place,” John Power, a geophysicist with the U.S. Geological Survey at the observatory, wrote in an email.

The eruptions during the last century lasted between three and seven hours, produced ash columns that rose more than 50,000 feet (15,240 meters) above sea level and deposited ashfall in south-central Alaska communities, according to the observatory.

In 1992, ashfall of about a quarter-inch in Anchorage prompted residents to stay inside or to wear masks if going outside to avoid breathing ash. The cloud drifted as far as Greenland.

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.

The 1992 eruptions prompted the temporary closures of airports in Anchorage and other communities.

Closing airports can be more than an inconvenience in a state where most communities aren’t connected to Alaska’s main road system. Ted Stevens Anchorage International Airport also is among the world’s busiest cargo hubs.



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Tags: 119733694AlaskasArticleCityClimate and environmentcomingeruptGeneral newsLargestmonthssciencescientistsU.S. newsvolcanovolcanoesWeeksWorld news
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