Caldera

Cauldron-like volcanic feature formed by the emptying of a magma chamber

A caldera ( kawl-DERR-ə, kal-) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. The ejection of large volumes of magma in a short time can upset the integrity of a magma chamber's structure by in effect removing much of the chamber's filling material. The walls and ceiling of a chamber may then not be able to support its own weight and any substrate or rock resting above.

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