Cinematic 4K 60 fps. A caldera is a large hollow that forms shortly after the emptying of a magma chamber reservoir in a volcanic eruption. A volcanic lake is a crater that was formed from explosive activity or collapse during a volcanic eruption. Flooding of the craters of an extinct volcano. Eruptions circular bowl molten magma gases underground lava erupted large great caldera subside volcanoes tephra pyroclast mountain mount explosion maar phreatic geology geological layer ground depression karst bedrock soil konya karapinar meke golu diatreme graben tectonic plate isostasy sedimentary thermokarst region aerial view landscape fly sunny day real earth flying drone flight ash ashes brown dark black cinder cinders tuff tufa nature natural treeless steppe plain surface UHD 3840X2160.