The Koryak volcano is a true beauty. Its growth surpasses all other volcanoes of this group, its height is of 3456 m. This is a typical volcano, with a very correct, one might say, classic shape of a cone.
At the apex of the cone in the south-western part of it is a modern crater with a diameter of 90 m and a depth of 24 m, rarely bother to work. In the northern part of the vertex is an ancient crater, now filled with a powerful glacier. The volcanic cone is remembered more because deep incisions are clearly visible, even if they are covered with snow. Koryak and Avacha represent great decoration areas clearly visible for tens of miles and it seems unthinkable to get along without them. The Koryak volcano has its own features. They lie in the fact that it is very rarely found in the active stage. Unlike its neighbor, the Avacha volcano, the tireless Koryak woke up only twice in historical time - in 1895-1896 and in 1956-1957, and even then his actions were very moderate. The first of these eruptions was relatively weak, the explosive events were not followed, and from its crater the erupted lava flew quietly. These flows can be seen now on the slopes of the cone, but they did not even reach its bottom. In short, the extent of the volcanic activity does not correspond to the "growth" of the volcano. After that, the volcano showed only weak fumarole activity. The last eruption (1956-1957) was more impressive. The awakening of the volcano was accompanied by a series of earthquakes, however, not very strong. In 1956, a crack length of 500 m and a width of 10-15 meters from it spilled ashes and other volcanic products and fume, raised the height of 1600 - 1700 m. But the crack was soon covered with slag and small fragments. It was an explosive eruption and different from other complete absence of lava effusion. The most interesting were the number of gas emissions from the remaining holes in the fracture. A. Sirin, and KM Timerbayeva directly observing the gas fountains of the volcano, noted that it was very spectacular. Clearly caught by the characteristic sounds made by gas jets, similar to squelch, whistling, hissing, hooting, all of which are repeated at regular intervals, indicate that a batch of these jets, occasionally they appear admixture of dark gray ash that was deposited rapidly, without going outside the cone. The isolation of gases and vapors in the Koryak volcano can often be seen today.