Report on Pavlof (United States) — July 1988
Scientific Event Alert Network Bulletin, vol. 13, no. 7 (July 1988)
Managing Editor: Lindsay McClelland.
Pavlof (United States) Fresh ash on upper flanks
Please cite this report as:
Global Volcanism Program, 1988. Report on Pavlof (United States). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 13:7. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.SEAN198807-312030.
55.417°N, 161.894°W; summit elev. 2493 m
All times are local (unless otherwise noted)
At 1800 on 20 July, Marsha Brown observed light steam emission from Pavlof's NE summit vent. The volcano's upper flanks appeared black with fresh ash, with more on the N than on the S slope. Six days earlier, at 1519 on 14 July, this ash had not yet been emitted and no steam was evident.
Geologic Background. The most active volcano of the Aleutian arc, Pavlof is a 2519-m-high Holocene stratovolcano that was constructed along a line of vents extending NE from the Emmons Lake caldera. Pavlof and its twin volcano to the NE, 2142-m-high Pavlof Sister, form a dramatic pair of symmetrical, glacier-covered stratovolcanoes that tower above Pavlof and Volcano bays. A third cone, Little Pavlof, is a smaller volcano on the SW flank of Pavlof volcano, near the rim of Emmons Lake caldera. Unlike Pavlof Sister, Pavlof has been frequently active in historical time, typically producing 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 historical 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: J. Reeder, ADGGS.