Global Volcanism Program | Image GVP-05754
Iliinsky, seen here from the NW, was constructed beginning about 8,000 years ago within a 4-km-wide caldera about the same age as the adjacent Kurile Lake caldera. A period of explosive volcanism during the mid-Holocene lasted 1,000-1,500 years. Growth of the modern cone was completed during the late Holocene. Lava flows cover much of the northern flanks and a 1901 eruption produced a 1-km-wide crater on the NE flank.
Photo by Oleg Dirksen, 1996 (courtesy of Vera Ponomareva, Institute of Volcanic Geology and Geochemistry, Petropavlovsk).