The Collaborative International Dictionary
Succussive
Succussive \Suc*cus"sive\, a. Characterized by a shaking motion, especially an up and down movement, and not merely tremulous oscillation; as, the succussive motion in earthquakes.
Wiktionary
succussive
a. Characterized by a shake motion, especially an up-and-down movement, and not merely tremulous oscillation.