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Poor weather conditions obscured visual and satellite observations of the volcano during most of this week. Pilot Point observers reported seeing a robust steam plume on Tuesday, and somewhat less intense steaming (puffing) on Wednesday. No thermal anomalies were observed on satellite images during clear periods.
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.