Scientists are warning that a volcano near Anchorage is exhibiting signs of increased activity, raising the possibility of an eruption in the coming weeks or months.
The Alaska Volcano Observatory reported Wednesday that recent aerial surveys detected a significant rise in volcanic gas emissions at Mount Spurr. While an eruption is not guaranteed, the observatory noted that the likelihood has increased.
“If an eruption occurs, we expect to see heightened seismic activity, increased gas emissions, and surface heating in advance,” the observatory stated. It added that stronger signs of unrest could provide several days to weeks of warning.
About Mount Spurr
Standing at 11,070 feet (3,374 meters), Mount Spurr is a glacier-covered volcano located roughly 80 miles (129 kilometers) northwest of Anchorage. It is one of 53 Alaskan volcanoes that have been active in the past 250 years and has two main vents.
Previous Eruptions
The summit vent last erupted more than 5,000 years ago. However, the Crater Peak vent, situated about 2 miles (3 kilometers) south of the summit, saw eruptions in 1953 and three times in 1992. Though increased seismic activity was recorded between 2004 and 2006, no eruptions occurred during that period.
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Last October, the observatory raised Mount Spurr’s alert level from green to yellow due to a notable rise in earthquake activity and ground deformation detected via satellite. Experts believe that if an eruption occurs, it would likely resemble those in 1953 and 1992. However, geophysicist John Power from the U.S. Geological Survey cautioned that the activity could also subside without an eruption or result in a smaller event.
Potential Effects
Past eruptions of Mount Spurr lasted between three and seven hours, sending ash clouds more than 50,000 feet (15,240 meters) into the atmosphere and blanketing parts of south-central Alaska.
During the 1992 eruption, about a quarter-inch of ash fell in Anchorage, forcing residents to remain indoors or wear masks when outside. The ash cloud even reached Greenland. Volcanic ash, known for its abrasive properties, can pose serious risks, including engine failure in aircraft.
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The 1992 event led to the temporary closure of airports in Anchorage and other areas. Given that many Alaskan communities lack road access, air travel is a critical mode of transportation. Additionally, Anchorage’s airport is one of the world’s busiest cargo hubs, making any disruption potentially significant.
Source: With input from agency