lecture15

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• Triggers are stimuli that abruptly imbalance driving and resisting forces governing the occurrence of mass movements.
• The most common triggers are addition of water by rainfall or snowmelt, ground shaking from earthquakes, and slope failures during volcanic eruptions.
• Mass movements do not require a specific trigger but instead occur when a threshold is reached gradually between forces that favor or resist slope failure.

15.4 When do mass movements occur?