|Volcano Kolokol has the appearance of a regular, graceful cone with a height of 1326 m above sea level. The crater of the volcano is severely destroyed, the crest is almost not preserved. At the top there was a flat area 150 x 200 m in size. A small lava flow descends to the west of the crater, there is a scree below, and several parallel lava flows up to 4 km long stretch from the foot of the cone almost to the seashore. A heavily strewn stream also descends along the southern slope of the volcano. A wide stream, in appearance of a very viscous lava, “reserves” the southeast slope of the volcano; apparently this was the last outpouring. From under the base of the cone south to the river valley. A slightly sintered pyroclastic stream descends with an even fish tape. Apparently, under the modern cone of the Kolokol volcano, some large crater is hidden, which gave this pyroclastic flow. The bell cone of Kolokol volcano is undoubtedly postglacial; there are almost no traces of erosion on it.
Горшков Г.С. Вулканизм Курильской островной дуги / Отв. ред. Рудич К.Н. 1967. 288 с.