Report on Pavlof (United States) — 15 June-21 June 2016
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 15 June-21 June 2016
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2016. Report on Pavlof (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 15 June-21 June 2016. Smithsonian Institution and US Geological Survey.
55.417°N, 161.894°W; summit elev. 2493 m
All times are local (unless otherwise noted)
AVO reported that activity at Pavlof had returned to baseline levels following a brief eruptive period in mid May; minor ash emissions were last observed on 16 May. On 17 June AVO lowered the Aviation Color Code to Green and Volcano Alert Level to Normal.
Geological Summary. The most active volcano of the Aleutian arc, Pavlof is a Holocene stratovolcano that was constructed along a line of vents extending NE from the Emmons Lake caldera. Pavlof and Pavlof Sister to the NE form a dramatic pair of symmetrical, glacier-covered stratovolcanoes that overlook Pavlof and Volcano bays. Little Pavlof is a smaller cone on the SW flank of Pavlof volcano, near the rim of Emmons Lake caldera. Unlike Pavlof Sister, eruptions have frequently been reported from Pavlof, typically Strombolian to Vulcanian explosive eruptions from the summit vents and occasional lava flows. The active vents lie near the summit on the north and east sides. The largest recorded eruption took place in 1911, at the end of a 5-year-long eruptive episode, when a fissure opened on the N flank, ejecting large blocks and issuing lava flows.