Volcanic calderas form when a magma
Position 1: Crater Lake in Oregon, formed roughly 7,700 years ago after the collapse of Mount Mazama, remains one of the most studied examples of this phenomenon.
Position 2: This process typically follows a large explosive eruption that expels enormous volumes of pyroclastic material.
Position 3: The resulting depression can span dozens of kilometres and may later fill with water to create a caldera lake.
Position 4: Volcanic calderas form when a magma chamber empties so rapidly that the overlying crust collapses inward.
Position 5: As the chamber depressurizes, the roof loses structural support and subsides along ring-shaped fault systems.
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