Caldera Golovnin forms the southern extremity of the Kunashir Island

Golovnin volcano forms a very gentle cone with a diameter of more than 10 km with a strongly truncated summit. At the top there is a caldera with a diameter of 4–4.5 km, inside which there are four extrusive domes and one dome on its slope.

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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