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A caldera is a cauldron-like volcanic feature on large central volcanoes, a special sort of volcanic crater (from one to several kilometers in diameter), formed when a magma chamber was emptied.The depression then originated either in very big explosive eruptions or in erosion and collapse of the magma chamber roof.f volcanic activity continues, the center of the caldera may be uplifted in the form of a resurgent dome such as is seen at Cerro Galan, GalÃ¡n Lake, Toba, yellowstone., etc by subsequent intrusion of. Magma a silicic or rhyolitic caldera may erupt hundreds or even thousands of cubic kilometers of material in a single. event
An example of a volcanic caldera that formed from the collapse of a magma chamber after large volumes of material were erupted is _.