Sector Collapse
Sector Collapse : The sudden failure of a significant part of the summit and (or) flank of a volcano, typically triggered by intrusion of new magma, phreatic explosions, or an earthquake. Also called flank failure or edifice collapse, such processes result in associated landsliding and debris avalanches, often creating deposits with distinctive hummocky topography (e.g., at Mount St. Helens in May 1980). At island volcanoes, large sector collapses can produce destructive tsunamis. See hummocks
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