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" ... Although this caldera did form during the 1912 eruption, this wasn't actually the source of the conflagration. According to the AVO, the sinking of Mount Katmai was down to the fact that the magma fueling Novarupta was primarily cached beneath this doomed edifice. When Novarupta took center stage, the volcanic pipes and chambers beneath Katmai quicly drained away, leaving an empty space for the overlying rock to fall into. ... "