AVO Bogoslof ORANGE/WATCH - No activity observed in monitoring data.
Sep 11, 2017 20:15 - Unrest at Bogoslof volcano continues. Mostly cloudy conditions obscured views, but elevated surface temperatures were recorded in one satellite image over the past day. No activity was detected in seismic or infrasound data from neighboring islands. Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Activity can escalate quickly with explosions producing high-altitude (>15,000 ft) volcanic clouds with little to no detectable precursory activity. Some previous explosions have been preceded by an increase in earthquake activity ...