Shishaldin Volcano is rumbling to life in the Aleutian Islands.
The Alaska Volcano Observatory detected long tremors and an increase in surface temperatures at Shishaldin on Tuesday.
Those could be signs of an an eruption, says Robert McGimsey. He’s a geologist at the AVO.
“Typical eruptions of Shishaldin have involved what we call Strombolian eruptions, which are gas-charged emissions,” McGimsey says.
Shishaldin, which is located on Unimak Island, is unique among volcanoes in Alaska. It doesn’t have a lava plug or a dome — just a deep, open vent.
McGimsey says that when Shishaldin erupts, “it’s gas bubbles coming up through the throat or the vent of the volcano.”
“And when they pop, it just kind of throws magma up into the air,” McGimsey says. “That’s kind of what defines lava fountaining.”
That lava glides down the flanks of the volcano, leaving a smooth layer. That’s why Shishaldin is the most symmetrical, conical volcano in the world.
But for now, there’s no lava coming out of Shishaldin. Satellite images show steam, and some light traces of ash.
Still, this is the most active that the volcano has been since 2009. The AVO started logging small explosions and ash clouds at Shishaldin this winter. They elevated the volcano’s official alert level in March.
- After AFN was founded, it focused on talks that led to the Alaska Native Claims Settlement Act of 1971.
- KTOO's Matt Miller watches over a fledgling eagle stranded in his backyard.
- Representatives of the AFN and the National Congress of American Indians met Wednesday to discuss a range of topics, including opioid and heroin addiction in rural Alaska.
- The Alaska Federation of Natives convention is scheduled to take place each year shortly after Permanent Fund Dividends are distributed.