An aerial view into the Shishaldin's summit crater (image: Alaska Volcano Observatory)The Alaska Volcano Observatory (AVO) reported that a new seismic unrest has been occurring at the volcano over the past month. Increasing levels of sulfur dioxide (SO2) emissions and gas have been detected from the summit vent. In addition, the seismic network registered small earthquakes and infrasound signals. Therefore, volcanologists raised the alert status for the volcano to Yellow.