quake
     n : shaking and vibration at the surface of the earth resulting
         from underground movement along a fault plane of from
         volcanic activity [syn: {earthquake}, {temblor}, {seism}]
     v 1: shake with fast, tremulous movements; "His nostrils
          palpitated" [syn: {quiver}, {palpitate}]
     2: shake with seismic vibrations; "The earth was quaking" [syn:
         {tremor}]
Source: WordNet® 2.0