A sector collapse or lateral collapse is the structural failure and subsequent collapse of a minimum volume of 1 km3 (0.24 cu mi) of a volcano. Unlike smaller flank collapses, a sector collapse can involve the central volcanic pipe and historically this term had been restricted by some writers to such events in arc stratovolcanoes, but is now used for large events in any volcano.
A sector collapse or lateral collapse is the structural failure and subsequent collapse of a minimum volume of 1 km3 (0.24 cu mi) of a volcano. Unlike smaller flank collapses, a sector collapse can involve the central volcanic pipe and historically this term had been restricted by some writers to such events in arc stratovolcanoes, but is now used for large events in any volcano.
Source: Wikipedia "Sector collapse" · CC BY-SA 4.0
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