The U.S. Geological Survey (USGS) reported that ground-based observations from local residents indicate that there were felt earthquakes and a light emission from Pagan volcano at about 14:30 local time on July 28.
This represents a departure from background activity and therefore the Aviation Color Code/Volcano Alert Status for Mount Pagan is being changed to YELLOW/ADVISORY.
Mount Pagan is not monitored with ground-based geophysical instrumentation. Furthermore, no indications of the current unrest have been detected in satellite or distal seismic data.
Source: U.S. Geological Survey volcano activity update 29 July 2021
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