Geologists are closely observing Mount Spurr in Alaska for potential eruptions due to increased seismic activity. The volcano has erupted twice historically, and current seismic activity suggests new magma may be intruding beneath it. The Alaska Volcano Observatory outlines various scenarios ranging from no eruption to significant explosive events, with ongoing monitoring in place to assess risks to air travel and surrounding areas.
Geologists are presently monitoring Mount Spurr in the Aleutian Arc of Alaska due to significant volcanic unrest. The Alaska Volcano Observatory (AVO) has indicated the likelihood of an eruption occurring in the upcoming days or weeks, a situation underscored by a marked increase in seismic activity beneath the volcano.
Mount Spurr, a stratovolcano characterized by its ice and snow-covered slopes, has erupted on two occasions in the past, specifically in 1953 and 1992. These eruptions primarily originated from the Crater Peak flank vent, approximately 3.5 kilometers south of the summit, and dispersed volcanic ash across various regions of Alaska and even reached the North Atlantic shortly after the explosions.
Previous eruptions released clouds of ash, pyroclastic flows, and led to the formation of lahars that temporarily obstructed the Chakachatna River. Historically, these eruptions retained the potential to cause significant geological disturbances,36 leading to consequences both locally and to the volcano’s periphery.
Since April 2024, seismic activity under Mount Spurr has escalated, averaging around 30 earthquakes weekly. Though such quakes do not guarantee an immediate eruption, this activity intensified in October 2024, with roughly 125 earthquakes documented weekly since then, including a notable quake measuring 2.9 in magnitude on January 2.
The AVO has stated that the ongoing unrest at Mount Spurr strongly implies the intrusion of new magma into the crust beneath the volcano. They have put forth several possible scenarios based on current data, ranging from the lack of surface magma to an eruption akin to those in 1953 and 1992.
The AVO posits two primary scenarios: one where the earthquakes diminish without magma surfacing, and a potential eruption producing significant ash clouds and hazardous flows. A less probable third scenario involves an eruption directly from Mount Spurr’s summit, which has not occurred in recorded history but would have serious implications due to the melting of glacial ice.
Fortunately, there are no towns in immediate proximity that would be jeopardized by potential pyroclastic flows or lahars. However, disruption to air travel in the vicinity remains a distinct possibility should an eruption transpire, as noted by Matt Haney of the USGS.
In their efforts to assess the situation, the monitoring team is employing a matrix of tools, including webcams, seismic networks, ground deformation stations, and infrasound sensors. Continuous analysis will provide further insights into whether an eruption is indeed imminent.
In conclusion, Mount Spurr is experiencing increased volcanic unrest, with the Alaska Volcano Observatory cautioning about possible eruptions in the near future. Recent seismic activity and historical context indicate multiple scenarios for potential volcanic events, ranging from minor eruptions to significant explosive events. Despite the absence of nearby urban populations at risk, monitoring efforts are essential to ensure safety and readiness.
Original Source: www.iflscience.com
