On July 26, 2004, the AVO raised the "Color Concern Code" at Spurr from green to yellow due to an increasing number of
earthquakes. Earthquakes beneath a volcano may indicate the movement of
magma preceding a
volcanic eruption, but the earthquakes might also die out without an eruption. In the first week of August 2004, the AVO reported the presence of a collapse pit, filled with water forming a new
crater lake, in the ice and snow cover on the summit. This lake may have been caused by an increase in heat flow through the summit lava dome. On May 3, 2005, a debris flow was observed in webcam images, as well as by a nearby pilot. A subsequent overflight revealed that much of the sitting pond within the melt hole had drained away, leaving a cauldron, and the color of concern was lowered back to green on February 21, 2006. The alert level for Mount Spurr was again raised to yellow (advisory) on October 23, 2024, due to an increase in seismic activity. ==Gallery==