In part one of this series, experts debunked recent headlines that Yellowstone’s supervolcano was on the verge of a catastrophic eruption. This part analyzes a more significant threat: Mount St. Helens.
“The take home point is that the amount of molten material is not sufficient to trigger a really large eruption of the type that Yellowstone is famous for,” said Mike Poland, scientist-in-charge at the Yellowstone Volcano Observatory.
“Here in the continental U.S., the most likely eruption will be somewhere in the Cascades,” said Jon Major, scientist-in-charge at the Cascades Volcano Observatory (CVO). The cascade range is an arc of a dozen active volcanoes that span from the Canadian border down into northern California.
“We are anticipating that Mount St. Helens, because of its highly frequent eruptive activity, that perhaps in the next few decades, we may see another eruption of Mount St. Helens, and that eruption is most likely to be very similar to what we saw through the 1980s,” said Major.
The 1980s eruption is considered the largest and most disastrous in U.S. history. 57 people were killed and hundreds of square miles were reduced to wasteland.
“There were a number of people probably living in the Pacific Northwest who did not even realize that these beautiful mountains that they see out their back window, are actually volcanoes that erupt periodically. So, it puts eruptions on the map of the public consciousness,” Major said.
Mount St. Helens might be the most explosive volcano in the continental U.S., but Mount Baker and Mount Rainier could be more dangerous due to their history of large volcanic mudflows.
“Communities that are down river from Mount Rainier, they have evacuation plans. They practice evacuation drills in the event that a large volcanic mudflow might be generated,” said Major.
Glacier Peak, which lies between Mount Rainier and Mount Baker, is the second most explosive volcano in the Cascades after Mount St. Helens. Glacier Peak poses another serious threat.
“Those eruptions tend to generate lots of volcanic ash. And that volcanic ash poses very serious threats both to airplane, the aviation industry, but then also to the communities that are downwind of the volcanoes,” said Major. According to Major, CVO’s safety strategy centers around research, monitoring capability and public outreach.
“The next time one of our volcanoes erupts, we’ll be able to communicate with the emergency management authorities and the public. The public will know what’s happening and we will prevent any real disasters from happening,” Major said.
