Uzon caldera seen from the east. Slope of the Uzon volcano cut by the caldera rim is at the right. The caldera hosts a large geothermal area and numerous hot and cold lakes. Present geothermal activity is concentrated in a 0.2-0.3 x 5 km zone filled with boiling springs, gas-steam jets, mudpots, small mud volcanoes, hot lakes and springs. Some of the lakes fill craters of the phreatic eruptions. A maar enclosing light-blue Bannoe Lake (at the foreground) formed ~3.5 ka BP. This lake is rich in sulphur. Cold Central Lake is the largest lake at the background.

Return To Feature