Free Republic

Some weird movements are associated with two volcanic areas in the US West: Glacier Peak volcano in Washington and Three Sisters volcano in Oregon. Here the stories: Glacier Peak in Snohomish County, Washington is currently at a “very high” threat for eruption. That’s the top classification of threat levels, according to federal scientists, who seek new monitoring systems: Meanwhile, the ground is swelling slightly faster than usual beneath parts of the Three Sisters volcanic region in Oregon, a new study shows, but scientists say there’s no signs of an imminent eruption. An uplift of about an inch in the ground...

The ground is swelling under the Three Sisters volcanic region in central Oregon. The U.S. Geological Survey issued a statement that the rate of uplift in an area 12 miles across has risen nearly an inch between June of 2020 and August of 2021. Yet, this latest uplift comes after some 25 years of activity. Scientists say it’s happening as lava is filling a space underground.

At approximately 10 a.m. yesterday (Tuesday, March 23), an ongoing swarm of small earthquakes began in the Three Sisters volcanic center in the central Oregon Cascade Range. This activity poses no immediate threat to the public. As of this morning, the regional seismic network has detected approximately 100 earthquakes ranging in magnitude up to about 1.5. The rate of earthquakes peaked late yesterday and appears to be declining slowly. The earthquakes are occurring in the northeast part of an area centered 5 kilometers (3 miles) west of South Sister volcano in which the ground has been uplifted by as much...

A 100-square-mile area around the South Sister is being thrust upward by an inch or two each year - too slow a change to be noticed in the course of a human lifetime, and too minute a motion to seem like more than a curiosity. But the uplift is occurring, as The Register-Guard's Karen McCowan reported in an Oct. 26 article, and it provides yet another reminder that our landscape is in a state of dramatic and potentially dangerous flux. From a geologist's point of view, an upthrust of an inch or two a year is a big deal. Over...