Island-volcano Rasshua is separated from Matua Island by the 28 km wide Nadezhda Strait

The active cone Vostochny has an explosive crater more than 500 m wide, open in the form of an amphitheater to the southeast.

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 of kilometers from the volcano in different directions. In addition, the outflow of lava flows onto the slopes of the volcano and the surrounding area is possibly.

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