The Alaska Volcano Observatory (AVO) reported a decreased activity at the volcano over the past week.
The latest monitored ash emissions occurred on 5 May, as only a light dust could be seen on the northwestern flank of Mount Young.
Hence, a decision has been made to lower the alert level to „Yellow“.
The AVO continues: Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Young and ash clouds usually under 10,000 ft (3 km) above sea level have characterized the recent activity and more ash-producing events could occur again with little warning. Semisopochnoi is monitored by a local seismic and infrasound network, local web cameras, regional lightning and infrasound sensors, and satellite data.
Source: Alaska Volcano Observatory volcano activity update 18 May 2023