7 October, 1852: no activity. Ash covered the top 100 m of the cone. 9 October, 0930-1110: heavy steam emission was visible on a rare windless day. The cone was covered with ash. 28 October, 1430: a steady "smoke" plume and occasional small ash clouds issued from the vent.

6 November, 0330-0500: an eruption was reported by fishermen working in the Bering Sea off Cold Bay. 17 November, 1240: "smoking." 18 November, 1510, 1715: heavy "smoke" rose about 200 m above the vent. 19 November, 0915: steam and ash emission. Ashfall had darkened the cone. 1530: steam emission.

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.

Information Contacts: R. Dean, USAF, Cold Bay.