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Caldera geometry determined by the depth of the magma chamber

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The depth of the magma chamber is shown to be an important factor governing the initial type, scale, and collapse of a caldera. The collapse of the magma chamber is approximated by the contraction of a sphere in an elastic medium, and the distribution of plastic and/or rupturing area on the surface is calculated using the Coulomb failure criterion under the assumption of an elastic-perfectly plastic material. It is found that the necessary contraction for the formation of a caldera is described by fifth-power polynomial expression of the depth of the magma chamber, and that the radius and geometry of the caldera are dependent on the depth of the magma chamber.


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Correspondence to Shigekazu Kusumoto.

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Kusumoto, S., Takemura, K. Caldera geometry determined by the depth of the magma chamber. Earth Planet Sp 57, e17–e20 (2005) doi:10.1186/BF03351879

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Key words

  • Caldera
  • magma chamber
  • caldera geometry
  • depth of magma chamber
  • numerical simulation