The two Islands of Ryponkich and Yankich are parts of a single volcano Ushishir, located 17 km south-west of Rasshua Island

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.

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.

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