AVO Bogoslof ORANGE/WATCH - No activity observed in seismic or infrasound data. 8 mile-long steam plume observed.
Jun 18, 2017 20:34 - No unusual activity has been detected in seismic or infrasound data from the past day. An 8 mile-long (13 km) steam plume emanating from Bogoslof island was observed in one satellite image over the past day. Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Activity may ramp back up with additional explosions producing high-altitude (>15,000 ft) volcanic clouds with little precursory activity. Some previous explosions have been preceded by an increase in earthquake activity that allowed for short-term forecasts of imminent ...