| seismic | | |
| adj. | 1. seismal, seismic | subject to or caused by an earthquake or earth vibration. |
| ~ unstable | lacking stability or fixity or firmness.; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy" |
| quake | | |
| n. (event) | 1. earthquake, quake, seism, temblor | shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity. |
| ~ seismic disturbance, shock | an instance of agitation of the earth's crust.; "the first shock of the earthquake came shortly after noon while workers were at lunch" |
| ~ earth tremor, microseism, tremor | a small earthquake. |
| ~ seaquake, submarine earthquake | an earthquake at the sea bed. |
| ~ geological phenomenon | a natural phenomenon involving the structure or composition of the earth. |
| v. (motion) | 2. palpitate, quake, quiver | shake with fast, tremulous movements.; "His nostrils palpitated" |
| ~ tremble | move or jerk quickly and involuntarily up and down or sideways.; "His hands were trembling when he signed the document" |
| v. (motion) | 3. quake, tremor | shake with seismic vibrations.; "The earth was quaking" |
| ~ shake, agitate | move or cause to move back and forth.; "The chemist shook the flask vigorously"; "My hands were shaking" |
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