is underlain by a dense intrusive complex (probably gabbro), about 12 km in diameter.
Below the centre of the caldera, material with lower density occurs, possibly a caldera fill, a subsided
block or
both. Existence of magma chamber is uncertain. If a shallow level magma chamber exists below the
Bárðarbunga volcano a likely location is at the base of the lower density region. Earthquakes occur
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