AVO Great Sitkin GREEN/NORMAL - Color Code/Alert Level lowered yesterday based on 2 month decline in seismicity
Jan 19, 2018 23:47 - The Color Code/Alert Level for Great Sitkin was lowered to GREEN/NORMAL yesterday based on decreasing earthquake activity over the past 2 months. In addition, no significant activity had been observed in satellite data and no steam plumes had been reported over the same 2 month time period. The decline over the past 2 months in the number of earthquakes suggests an intrusion of magma beneath Great Sitkin, which caused elevated seismicity during late 2016 and most of 2017, has possibly stalled and the volcano is returning to a period of background seismicity. Future ...