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Poor weather conditions obscured observations of the volcano during most of this week. Pilot Point observers reported seeing a small steam plume last weekend. Chiginagak Volcano is not monitored by seismic instrumentation.
Beginning on October 22, AVO received multiple reports of
increased steaming, snow-melt, and sulfur smell at
Chiginagak Volcano, a 7005-ft-tall (2135 m), snow- and ice-covered symmetric stratovolcano. It is located 110 miles (175 km) south of King Salmon and 37 miles (60 km) southeast of Pilot Point on the Alaska Peninsula. Robust steam plumes have issued from an active fumarole at an elevation of about 5500 feet (1676 m) on the north flank of the volcano since at least 1943 and sulfur deposition in the vicinity of the fumarole discolors the adjacent snow and ice. Reports of historic activity at Chiginagak are poorly
documented. Prehistoric domes, young pyroclastic deposits and lava flows occur on the volcano's flanks.
Seismic activity is monitored in real time at 16 volcanoes
in Alaska. Some of these volcanoes may currently display
anomalous seismicity, but they are not considered to be at
a dangerous level of unrest.