Relating to or caused by an earthquake or seismic activity.
From Greek 'seismos' (shaking, earthquake) with the suffix '-ic,' though the initial 'c' spelling is archaic or variant; modern form is 'seismic.'
Ceasmic is how seismic used to be spelled, a fossil spelling from when English was still figuring out how to handle Greek scientific terms—it lost the race to the more familiar seismic.
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