AVO Semisopochnoi YELLOW/ADVISORY – Unrest continues; satellite data obscured by clouds. Seismicity is low.

Sep 20, 2019 22:29 – Unrest continues at Semisopochnoi volcano with low-level eruptive activity possible. Seismic activity has generally decreased over the past few weeks and AVO lowered the color code/activity level to YELLOW/ADVISORY on Wednesday September 18, 2019. Satellite observations were mostly obscured by clouds over the past week and no activity was observed.

Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 …