Maly Semyachik
| Maly Semyachik | |
|---|---|
| Малый Семячик | |
.jpg) Maly Semyachik peak | |
| Highest point | |
| Elevation | 1,527 m (5,010 ft) |
| Listing | List of volcanoes in Russia |
| Coordinates | 54°08′N 159°40′E / 54.13°N 159.67°E |
| Geography | |
  Maly Semyachik Location within Russia | |
| Geology | |
| Stratovolcano within a caldera | |
| Last eruption | December 1952 |
Maly Semyachik (Russian: Малый Семячик) is a stratovolcano located in the eastern part of Kamchatka Peninsula, Russia. It is a compound stratovolcano located in a 10-km-wide caldera within the 15×20-km mid-Pleistocene Stena-Soboliny caldera. Three overlapping stratovolcanoes were constructed sequentially along a NE-SW line, with the youngest cone, Tseno-Semyachik, at the southwest end. A hot, acidic crater lake fills the historically active Troitsky Crater, which formed during a large explosive eruption of Ceno-Semiachik about 400 years ago.
The water in the lake is poisonous and has an unusual bright turquoise color as a result of several types of acids and other substances being dissolved in it. The water in the lake never freezes, even when everything is covered with a layer of ice and deep snow. The name "Semyachik" in translation from Itelmensky means "Stone Earth".