This note describes a simplified approach to the preliminary assessment of rock toppling as the result of earthquakes, blasting, or other vibrations. The method is dynamic in the sense that it goes beyond pseudo-static or quasi-static analyses to incorporate information about vibration frequency in addition to acceleration magnitude. It is simplified in the sense that it assumes single-frequency shaking of a rectangular rock, and thus falls short of a complete dynamic analysis of an irregular three-dimensional rock with complicated basal geometry and a full spectrum of frequencies. The approach was originally motivated by a consulting project in which the possibility...

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