No latest activity reported for Ivao Group.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Gorshkov G S, 1970. {Volcanism and the Upper Mantle; Investigations in the Kurile Island Arc}. New York: Plenum Publishing Corp, 385 p

The Ivao group of cones along the Krishtofovich Ridge of SW Urup Island contains several well-preserved cones of Holocene age. The first of a group of three young cones that formed along a NW-SE line is 1426-m-high Ivao cone, which marks the high point of Urup Island at the NW end of the chain. The SE-most cone bisects a glacial valley, forming Lake Ivao. The elongated central cone, Krutaya Mountain, is the youngest, and produced a viscous lava flow that traveled to the east.