Event Name : Cleveland 2020/6
|Start:||June 1, 2020 ||Observed|
|Stop:||June 1, 2020 ||Observed|
|Tephra plume: ||
Regional infrasound sensors recorded an explosion Monday night at about 06:32 UTC June 2 (10:32 PM AKDT June 1). A small ash cloud was observed at 22,000 ft asl drifting to the south. The eruption blew out the January 2019 dome and a large amount of material from summit crater. Volcanic debris flows also extended ~2.9 km (1.8 miles) down the eastern flank of the volcano and more than 2.7 km (1.7 miles) down the northern flank. Since the explosion, cloudy to partly cloudy satellite views have showed no significant volcanic activity, with no elevated surface temperatures and only a small steam plume. No activity has been detected on regional geophysical networks. Due to this increase in activity, the Alaska Volcano Observatory raised the Aviation Color Code for Cleveland Volcano to ORANGE and the Volcano Alert Level to WATCH on Monday, June 1. There was no further sign of eruptive activity after the June 1 explosion, and AVO lowered the Aviation Color Code and Volcano Alert Level at Cleveland to YELLOW/ADVISORY on June 17, 2020. With a continued pause in eruptive activity, AVO further lowered the Aviation Color Code and Volcano Alert Level to UNASSIGNED on September 3, 2020. During 2020, Cleveland volcano was monitored with a limited real-time seismic network. This smaller network inhibits AVO's ability to detect precursory unrest that may lead to an explosive eruption, which results in being designated UNASSIGNED rather than Aviation Color Code GREEN, assigned to quiescent volcanoes with more instrumentation.