was 110 km².
The large scale subsidence of calderas is considered to accompany most very large eruptions as the roof overlying a reservoir of magma in the crust under the volcano collapses and falls into it. Eruptions of this
type are not common. Before Bárðarbunga, worldwide only six cases are known since the beginning of the 20th century. Moreover, the caldera collapse of Bárðarbunga is the first
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