from The Century Dictionary and Cyclopedia

  • adj. Exhibiting an up-and-down vibration of long amplitude, which causes a jumping movement: descriptive of a variety of earthquake shock.


  • These shocks have been so frequent, (sometimes sussultatory, and sometimes undulatory,) in the two provinces, that one can scarcely say that they have ever ceased, since the day which was so disastrous, to them.

    Robert Mallet, Great Neapolitan Earthquake of 1857

  • Earthquakes have been divided into undulatory, sussultatory or vorticose shocks according as the movement is nearly horizontal, nearly vertical, or frequently changing in direction or rotatory.

    Charles Davison, A Manual of Seismology


This word comes from the Italian ‘sussultare,’ jump up.