seismic

seis|mic /s'aɪzmɪk/
1 [ADJ] ADJ n
Seismic means caused by or relating to an earthquake.
Earthquakes produce two types of seismic waves...
2 [ADJ] usu ADJ n
A seismic shift or change is a very sudden or dramatic change.
I have never seen such a seismic shift in public opinion in such a short period of time.

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