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Ksudach , also known as Stubel volcano or Voniuchi Khrebet, is a caldera volcano that is well known for its great eruption of 1907. At the bottom of this caldera is located two lakes Bolshoe (meaning: big in Russian) and Kraternoe (meaning: cratered in Russian). Kraternoe occupies the 1907 eruption crater, Stubel, and is the headwaters of the Khodutka river while other lake has not outlet.
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Scientists believe that Ksudach caldera itself lies within a huge ancient caldera. KsudachUs caldera is circular and has a diameter of about 7 km. Several smaller caldera, 3-5 km across, can be found in the northern part of this caldera. The active strato-cone, Stubel is located in the northernmost caldera and a part of a linear chain of small lava volcanoes and cinder cones that cut across this northern portion of the caldera.
Sources of Information:
Vlodavetz V.I., Piip B. I. 1959 Kamchatka and Continental Areas of Asia. Catalog of Active Volcanoes of the World, Rome IAVCEI, 8: p11-15.
Erlich, Edward 1986 Geology of Calderas of Kamchatka and Kurile Islands with Comparison to Calderas of Japan and the Aleutians, Alaska Open-File Report 86-291, US Dept. of the Interior- Geological Survey, p103-6.