The two Islands of Ryponkich and Yankich are parts of a single volcano Ushishir, located 17 km south-west of Rasshua Island
|Form and structure
Ushishir volcano is a heavily destroyed caldera with a diameter of up to 1.6 km with a slope height of 20 m in the north to 130 m in the south. The southern part of the caldera wall is breached, and the waters of the Pacific Ocean fill its bottom, forming a caldera bay with a diameter of 1 km, in which there are four extrusive domes.
|augitic andesites, andesites, andesite-basalts, dacites, hornblend andesites, two-pyroxene andesites
|Aviation color code
|Last VONA/KVERT Releases
No VONA/KVERT Releases
Ash clouds, ash falls, pyroclastic flows, hot avalanches and lahars are a potential hazard associated with explosive eruptions of this volcano. The volcano poses a potential hazard to international and local airlines passing in the Kuriles region, since the height of its ash emissions can reach 10-15 km above sea level, ash plumes and clouds can drift hundreds and thousands of kilometers from the volcano in different directions.