Description: On February 12, 2024, at 1:10 PM AKST, AVO raised the alert levels at Gareloi to YELLOW/ADVISORY, stating: "Over the past several hours, AVO has detected an increase in seismicity at Mount Gareloi (Gareloi volcano) beginning at 09:15 AKST (18:15 UTC). The current activity marks a change in character above background rates...There have been no other notable changes at the volcano in satellite data or webcam views. Mount Gareloi persistently emits magmatic gases from a fumarole field on the south crater and commonly exhibits low-level seismic activity. These observations suggest the presence of shallow magma and potential interaction with a hydrothermal system. The current increase in seismicity likely reflects a change to the magmatic-hydrothermal system, but it is not clear that the likelihood of a volcanic eruption has increased."
In the week afterward, seismicity remained elevated, with numerous earthquakes and volcanic tremor. In the following week, seismicity did decrease somewhat, while remaining somewhat above background levels. Steaming was frequently observed, but this is not abnormal at Gareloi.
On March 5, 2024, AVO returned the alert levels to GREEN/NORMAL, stating that seismicity had returned to background levels.